Malicious PDF — malware analysis report

Static analysis result for SHA-256 65e1d7af5612de96…

MALICIOUS

PDF

84.7 KB Created: 2021-08-10 16:56:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0ceb0a046e3c4fbd4f00ad56d1512842 SHA-1: 1fe9072ed9c784b03b4a21c192e1c22c5e2203d6 SHA-256: 65e1d7af5612de96073fd20ab7a844ea567b3ae2ac873d01a812ec18f1dd58ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating the PDF's primary function is to act as a lure. No scripts were extracted, but the overall structure points to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/uplcv?utm_term=all+i+want+for+christmas+is+you+michael+buble+ukulele+chords PDF link annotation
    • http://thebellingerfamily.com/clients/0/05/05034faaa501c69409a7459485cba135/File/toguxemiwavejoposebevuvo.pdfIn PDF document text
    • http://sandsflooring.co.uk/ckfinder/userfiles/files/69786388717.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/faefe290ed2c62ea35b0d8b8dcb7dad1/47646654716.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8999ae80e---16258298055.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/iqlo2kg8p6nd5vre7d81l0ilo6/wavugeguriza.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/36598493742.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/legukozixifenebivemudiros.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160bb18e61e693---jubobagotefivagozovusufod.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/12c7c9c7463ef5dfb4d1dcc4ac3e430d/47929423569.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/73776289539.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608226a58d668---zemetetede.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/vewozokivumafafi.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/24729269279.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/b0b4eec0740ac590d303eb2244308534/kuwaguzut.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a16b5271dc7---84606277595.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/rasetig.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/77736501219.pdfIn PDF document text
    • https://fisheaglesafaris.net/pics/user/file/54972796775.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/28154357768.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3df16a4b4---74277991161.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/88582786952.pdfIn PDF document text
    • http://nomaquito-travel.com/editor-images/10048398761.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/nukikisiwujekuvopi.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_off0000daad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BF 22344 bytes
SHA-256: 19f7551a5e812a91331d0c0afdcc21a93cdfc6488aa36e2a8cb83637c95c0604
font_02_sfnt_off00012926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12926 11256 bytes
SHA-256: c474e717931893419bc01e945d8818573f8e441c32246938b4f7858b398dd665

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