Malicious PDF — malware analysis report

Static analysis result for SHA-256 7850fe206996f5a8…

MALICIOUS

PDF

79.1 KB Created: 2021-09-21 03:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d48bfbaf5c529453cd3290bd7b21d3f5 SHA-1: 9a513fa21fe70d43f4ae6a52d9e1932747664efd SHA-256: 7850fe206996f5a80fc7f4383a30de432d34bc1004f54b996c7efbf87f9d88b2
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it's a PDF link farm and a callback phishing lure. The document body is heavily obfuscated, but the presence of external URIs and a link farm suggests an attempt to redirect the user to malicious sites. The heuristic 'SE_CALLBACK_LURE' strongly suggests a social engineering pretext involving a phone call.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://chcial.ru/uplcv?utm_term=among+us+free+no+download PDF link annotation
    • http://jinruily.com/UploadFile/file/20210901060528800.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/vebeguxa.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/lokedomuxomiz.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/66834730530.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/modejavamewezuwimaxi.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/nirumabapa.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/xikutitegomajul.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de7e5a3caf---41115874091.pdfIn PDF document text
    • https://mrpressconsulting.com/UserFiles/file/60916046599.pdfIn PDF document text
    • https://oceanflowerhotel.com/uploads/image/files/bapuwosuzunurove.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/xafurasajodejozeve.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/ratuxanak.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/23262295706.pdfIn PDF document text
    • https://thegmsbihta.in/userfiles/file/ragin.pdfIn PDF document text
    • http://obkladacstvikolar.com/content/vifotemurore.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/xanekurizoxe.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/xiweleregibixikomudoma.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613daa704ee44---zobara.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/31578717798.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/jse1p862lemrth49cccar06ck3/91674063109.pdfIn PDF document text
    • http://noithatmyhome.com/img/files/62545987096.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/fonivibugosokupebidupa.pdfIn PDF document text
    • http://papienbanana.com/user_file/file/6722025708.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_off0000d159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD159 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e96b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96B 17208 bytes
SHA-256: a7f44a0f5a53eee579399f2558e73e2219c3e9ecb0924e7b048c6602a9358441
font_02_sfnt_off0001168a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1168A 10676 bytes
SHA-256: 21b5856d171f32ec1fbc638f4dbc345fd355913291a88dc81fd5e9110e89faf9

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