Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e402137b0477fe3…

MALICIOUS

PDF

74.2 KB Created: 2021-09-19 11:27:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0956d83452e090bf7e7839f59602ab13 SHA-1: d50640bbc84517a0bdacbd2991d2540151340dde SHA-256: 9e402137b0477fe3863fa5eea9776cd760cc44232b599edb337c048126ad7182
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by a machine learning classifier and ClamAV, indicating it is likely a phishing or scam attempt. The 'SE_CALLBACK_LURE' heuristic suggests the document prompts the user to call a phone number, consistent with callback phishing or tech-support scams. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a malicious intent to deceive the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://catamma.ru/uplcv?utm_term=stuck+on+restoring+iphone+firmware PDF link annotation
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16141b75fedabc---25161919920.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/wirakepimujanizeve.pdfIn PDF document text
    • http://gonvvama.net/filespath/files/20210911024755.pdfIn PDF document text
    • https://sudahhabis.com/contents/files/wuxuxas.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/65831761424.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/75489690965.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/f91dba1385e9300265f818f74302858a/zivotitamoza.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/49762332793.pdfIn PDF document text
    • http://eko-uklid.com/files/file/telapulavibog.pdfIn PDF document text
    • http://talentfuturesservices.com/sharpinstitute/images/files/kujemuluj.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/sodume.pdfIn PDF document text
    • http://dnt-mayak.ru/content/File/vugevasususezuweb.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/lixaratixatuvabotawux.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140e9832453e---sefadudatalogib.pdfIn PDF document text
    • http://theponghop.com/upload/files/78253621113.pdfIn PDF document text
    • http://mousike.it/img_ins/files/37109093267.pdfIn PDF document text
    • http://medeeatour.ro/mm/file/xufolifupo.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/73557825481.pdfIn PDF document text
    • http://i-physiology.ru/upload/maxivox.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/wixen.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16130b4a464e46---kutozekupemoruvipomi.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_off0000be1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE1A 16892 bytes
SHA-256: a14f2ed74636d8efd947d013cc938fd678099f9bca82f0c8f2d3a8142042edc8
font_01_sfnt_off0000e952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE952 11236 bytes
SHA-256: fca31314f75792476fc336c9acac3205006a6ac71f5d9ff0058f92023aab413b
font_02_sfnt_off0001039b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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