Malicious PDF — malware analysis report

Static analysis result for SHA-256 afc175839aea6fb6…

MALICIOUS

PDF

110.6 KB Created: 2021-08-11 03:31:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 16c38782bf456d8d591db99e8fc16f5c SHA-1: 3c293813a3624d9f8042b6c2c308bb393482c005 SHA-256: afc175839aea6fb6da531006a60d160dad4aa4331482a585f331b89356b8256a
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including ML classification and ClamAV detection. The presence of social engineering lures like MFA harvesting and a call-to-action button, combined with numerous links to compromised WordPress sites and disposable hosting, strongly suggests a phishing or malware distribution attempt. The document likely exploits PDF vulnerabilities to redirect users to malicious sites or prompt them for sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://cructi.ru/uplcv?utm_term=how+to+fix+pubg+lite+is+unavailable+in+your+region PDF link annotation
    • http://urparitet.ru/admin/ckfinder/userfiles/files/92145064270.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078bc9508b3f---sizodavejaxuvixexebi.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/94dc542f0e28c13330b6ef665e2ccd54/87629278903.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/67vnvct6h71144u9bej7q8sbo5/rezax.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/gosugefelutawikixudoxod.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/wematumiwufuxazawuful.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/jizexuludoveretatu.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1608347a262b52---26149363277.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/cdj15r1tct8d0ar7v4pu733ut6/rofudezupejogudofamib.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/60340344963.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/manodelotesixa.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8a4ed9202---pedawofev.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/90094747777.pdfIn PDF document text
    • http://clarkhigh72.com/clients/3/34/34275c7d49a174b5f6cf03bf5966da6c/File/75028333151.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb9c20480c---mixovazasokimudivowujada.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbcc190c83e---99362697366.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/57fcb78320fcae8dc7294fd07138175e/69674335352.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/17321517706.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160c323583890d---49956446395.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/e8876305b055c1609a285676769cced0/59323726800.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/5440214824.pdfIn PDF document text
    • https://jotelek.hu/files/file/82078270195.pdfIn PDF document text
    • https://aeternoplanning.com/ckfinder/userfiles/files/lobebafesuwiratoj.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/fbc602437eb87f684a282dff02a94b6c/modifatejitomelaloruk.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/75cb6866bcc2ad1c061495f73b57fdfd/sorokasavuwafalumibux.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000148de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148DE 19828 bytes
SHA-256: 840426912ff16cb59ba8954052687c5a5e356499b5a57a4cb3199b61625fed78
font_01_sfnt_off00017a55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A55 11132 bytes
SHA-256: cd133c78abfd465d4c52f7835b34d1d0aab69a083ce16e7ba0fb04c72d011fdd
font_02_sfnt_off00019448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19448 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1