Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d813cff27b19e84…

MALICIOUS

PDF

91.3 KB Created: 2021-09-02 15:42:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3fe08ff5a92ff252d38503fa7727fb19 SHA-1: 851ebcd8718a9305c4edb7202a2b5f2c3c579262 SHA-256: 9d813cff27b19e84a402515522192eca310bb710deba242a2db83c6a6eba6539
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution intent. It contains a link farm pointing to multiple domains, some of which are associated with compromised CMS uploads, suggesting an attempt to lure users to download further malicious content. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://open-call.fr/uploaded/files/60920983267.pdf In PDF document text
    • http://pytextiles.com/userfiles/file/12499175193.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/d734c7ade2bfeb3ad91f06a65569a535/82598090966.pdfIn PDF document text
    • https://thepainter.asia/upload/files/sawufopuxezagebe.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae93a6a53b5---34307049010.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/datoja.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d65f7e54ef5---11987958461.pdfIn PDF document text
    • http://cesmclassof68cheyennewy.com/clients/82478/File/duvoxedexifon.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/05bcfa2cd03ac63bdaf68f881e8b5cf1/zasivurevuxeluzax.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/07/22/file/lamibewajalonuwakapowizu.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/ab981ff06017281b7787f6c31ca2d104/zezadulupa.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/63005717847.pdfIn PDF document text
    • http://eunlocker.com/Images/Editor/file/pifamufuv.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/pevopubaxenepise.pdfIn PDF document text
    • http://homenet-spb.ru/userfiles/file/45497220241.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/kufuj.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/35553683947.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/0905a0ee197ed15359dac4cb642d0aa5/11994725782.pdfIn PDF document text
    • https://michelbarbot.com/upload/files/japilurevipobi.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/nebezamejowejosatakufa.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/36749709b2229090e18688c206562385/dusinup.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e5c33b741---831273981.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/gunudaxutabebew.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/47837092715.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606c951a56dce---95224454448.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=libros+de+la+saga+crepusculo+para+descargar+gratis+en+pdfPDF 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_off0000fbc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC0 19368 bytes
SHA-256: bb9b8414949f6a176056ad3af1ba10a6b1cce8f1a5ff7b143d6b46a1858d4ddf
font_01_sfnt_off00012d99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000145b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145B0 10992 bytes
SHA-256: 59f5e082d530dee22eb00a6f744f00672a894e0016796cd380ae74e9c84dd903

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