Malicious PDF — malware analysis report

Static analysis result for SHA-256 adda1a2893b5ba2b…

MALICIOUS

PDF

77.2 KB Created: 2021-07-29 23:44:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 51be92a6b6b96b9b51cfc663d1dd0840 SHA-1: 71e18acf3183ea6880a73d8833f725a0c5a01fee SHA-256: adda1a2893b5ba2b2a691b338d45fe08c0a4e14e08ac32c793a1c33cf5d01563
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to host malicious content or redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://krisoc.ru/uplcv?utm_term=air+fear+of+god+1+sizing PDF link annotation
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/ql9subbrlpn5so8gbe1ncb3uk4/72334467313.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/53762491216.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/waxenevar.pdfIn PDF document text
    • https://soechi.net/userfiles/file/juwinovetexarelabu.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/fefixuluxizigoza.pdfIn PDF document text
    • https://codecs.ro/images/file/29823776994.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/92489602369.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/f3ab709f35878b131436146bcff3f57e/6330593916.pdfIn PDF document text
    • http://avanti.pl/userfiles/file/visotozopaki.pdfIn PDF document text
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071cefdceefc---47960430351.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/046fe85a4bad7ae54fe5eee609a6579e/12466711246.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/d573cb2fd71d4f996ab96fb45d6cf00d/98775864430.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/mapowipukum.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/f2565fa6f4677ad1da0c836fbcd227d9/20335199451.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160fbc4d4db7e9---kebosenekevedirokofa.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/fdd01ed7dee9a3c38ae24c47bfe6acae/xedumoxa.pdfIn PDF document text
    • http://scheidenschiedam.nl/uploads//file/gekonuzanuvumonuvepev.pdfIn PDF document text
    • http://hulstcustoms.ru/uploads/files/93038617922.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/valevazirumimokaxop.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6863d6f01---tosid.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/14926819179.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/87746673fd25579805623b2da0fe5376/51061104782.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/ds6hj4c37da43smtgesaf8sdt3/18830072883.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/noxawunud.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/7ed2abaf34ebe50d72c17f460a653e61/15622941468.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e73a0e6eb---rolubopuk.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_off0000c85a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC85A 17296 bytes
SHA-256: 17e9103e88278816a25e125d191ca841666af6fe809b03fe0a2a5e7e7542469c
font_01_sfnt_off0000f5a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A4 10476 bytes
SHA-256: 23f78de04144b6fda4ac9e01c6fed51a608731fe4b6a3deb811854d991c6bafc
font_02_sfnt_off00010d6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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