Malicious PDF — malware analysis report

Static analysis result for SHA-256 d16376f975e71e4b…

MALICIOUS

PDF

95.4 KB Created: 2021-09-13 23:15:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 21a86615bec413ccf2175a45e24f18c1 SHA-1: 35338f20ea18c2d34ba4e728749a6675c36e1c72 SHA-256: d16376f975e71e4b9b4ca0c63324a9623f4d2198a6953dfbe3a2ca953eef845e
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that form a link farm, with several pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URI links further supports the attack pattern of directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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=friends+reunion+watch+online PDF link annotation
    • https://westhigienia.hu/editor_up/jibuzenuruwufolibekefogi.pdfIn PDF document text
    • http://lblussana.it/images/file/piwuki.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/62317883746.pdfIn PDF document text
    • https://www.tristar-technology.com/ckfinder/userfiles/files/kegijutonobizul.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/66297536796.pdfIn PDF document text
    • http://phunphu.com/userfiles/file/43987111562.pdfIn PDF document text
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/vubinasosumafidedi.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/e859596300e096a33088115e96cb7618/60218984075.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/83470251896.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/ruwawatumusajo.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/52326575776.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/97455515273.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/76633599413.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/72120891480.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/files/52858642020.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5b9d4de61---zenuwer.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/rumadij.pdfIn PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/pofebotakeseminepapi.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/be281a79ff18361d27b84196927f070d/lijiraremenatogezakapido.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/itq97e3k3uivqiie7do93lmorc/bonasigixuvetejija.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/f73e5c2ffcf6ebff583e78be526393de/jabafelunukolisipefum.pdfIn PDF document text
    • http://asavn.vn/uploads/userfiles/files/29532397468.pdfIn PDF document text
    • https://airbays.com/userfiles/file/monatu.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_off00011006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11006 18456 bytes
SHA-256: 872f7652cda70d8890a3319d3f4c0d370ba9c17afa3d543ae4d5db77a6d3135d
font_01_sfnt_off00013fad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FAD 10628 bytes
SHA-256: 503667d26d403a31ff3ac00037b219bd3f36ca77707a96b18494966132c648d7
font_02_sfnt_off000157fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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