Malicious PDF — malware analysis report

Static analysis result for SHA-256 a157ec3379134a71…

MALICIOUS

PDF

82.1 KB Created: 2021-09-02 06:00:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5885af5821026193048f0219e0afa879 SHA-1: 77040b6fb0689c40359a7ddc85a25560982d0939 SHA-256: a157ec3379134a711420b8aeb926e15e6bab986d43b6d01d468f1e479c9a8841
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of external links and the high confidence verdict indicate a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://allytemp.ru/uplcv?utm_term=intention+to+treat+analysis+vs+per+protocol PDF link annotation
    • http://duda-tech.pl/dudatech/upload/file/kasijofokib.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/juxowu.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea326f0fa7---47472598495.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/4fb6e685d9eed0a2eb97d77c5a1bd2c6/31005979976.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94580858981.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0dc36772f2---datirureme.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/96307487654.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/muxipugakeborexobebemaxa.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/8cf108d44370b9199f7647530a425fb8/95364015706.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/623838e8f4d09f2303fa870583698054/10487612369.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/kipegodikok.pdfIn PDF document text
    • https://s-h.cc/uploads//files/202108020422589769.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc36519359---varipapabajolowitazumu.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160702a91a625c---dupadibamezipigetitu.pdfIn PDF document text
    • https://sanagustin.cl/files/48922489721.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/93005545022.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/15890131572.pdfIn PDF document text
    • http://dahchen.tw/userfiles/file/6174833357.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/58045834347.pdfIn PDF document text
    • https://areicon.com/images/file/72708537377.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/161131cb2cd405---litalijasil.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/vcicgdb0j50reoe73tvsei4sc6/80372866991.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/96697154608.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/57179399318.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_off0000dc99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC99 10500 bytes
SHA-256: 7c4fa72cb2e8b4d942c67c9eb7917c9dda841baa9a4e9b70297fa49b3d0317c0
font_01_sfnt_off0000f4ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC0 17772 bytes
SHA-256: e02380b72c770fe695125d6b5775831a6e1bf1497294bb1fda71bfe158a2bfc1

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