Malicious PDF — malware analysis report

Static analysis result for SHA-256 74577ba3d0942db8…

MALICIOUS

PDF

87.6 KB Created: 2021-09-02 14:56:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c0b1e625180979cb4dbbc33099e172b1 SHA-1: f9ee4db48d7a7c7a30e2bff0ad408ddf86d8c077 SHA-256: 74577ba3d0942db8724547ea603914b1c4e40db7a6f68619c5efe691ebe01855
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to other PDF files hosted on potentially compromised websites or disposable domains, indicating a link farm or SEO poisoning tactic. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. While no scripts were explicitly extracted, the nature of the links suggests a potential for further malicious activity or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/4933230e42d49fa9a166e8783b098511/68973115637.pdf In PDF document text
    • http://bdata.vn/upload/files/7435911904.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/37358962648.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/93254145448.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/jigezerotu.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/73734646798.pdfIn PDF document text
    • http://zonweringbelgie.com/ckfinder/userfiles/files/weluzodukaxarapofobevuk.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/c54c738kj0ok22gbc9mpdj72jr/jukevanurotonogigewumure.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/73182852058.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/45792813069.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a373c8e743b---muzinevomubolopo.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/sususutuz.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c0944a71397---73874691954.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095c52c29b7d---xabaw.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/97932209744.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/98568441061.pdfIn PDF document text
    • http://snotlicker.com/clients/10243/File/14934367143.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/xedules.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16097c51305f47---tiriki.pdfIn PDF document text
    • http://yuli-china.ru/d/files/54134409149.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/d931739065b6e289f5f2f8a188306955/xisikebetuv.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/277f93d3c583447c3f2ca4971daabff4/filuvimuvobezepujel.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb3bf7e38eb---27697781830.pdfIn PDF document text
    • http://ustunongel.com/image/files/86212031375.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/6fm8e5jj5b5gevbgvpcklokjln/11949328383.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=iq+test+questions+and+answers+pdf+free+downloadPDF link annotation
    • 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_off0000ec0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001041c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041C 19660 bytes
SHA-256: 05a974f14476dacb8a4b4b313d09ddcb6ce2e92c31366d136661b41593eacb78
font_02_sfnt_off00013774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13774 10776 bytes
SHA-256: b971c4e7fb885767a36a20cecca6ab9b7a5cc97f5161143b5eb1dd1c8ed729e5

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