Malicious PDF — malware analysis report

Static analysis result for SHA-256 3748b83fec6accf2…

MALICIOUS

PDF

83.0 KB Created: 2021-09-18 04:54:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 72758dc9a57968dc1a2758ab610f00d6 SHA-1: 21d6fe55b847151ba047a1dc4544ea93a2d33ab0 SHA-256: 3748b83fec6accf2eca81151f559fbf383f8abc7bf005e75f2b1d6dfc03d89bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ClamAV and an ML classifier. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting domains. These links are likely intended to lure users into downloading further malicious content or visiting phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://videocycling.info/files/file/21790071025.pdf In PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1d1624ae1---fokemijimelebuse.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/ferozasi.pdfIn PDF document text
    • http://fittbikese.hu/files/file/zolat.pdfIn PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/78088403224.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/21821778383.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/88857985100.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f19ca69dbd---26904763552.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/dotebexanafinu.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210909125747.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/bc152321a1355d7911e52daaa0a925f7/33255939617.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613406317faf8---gafemuxofa.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140383354793---4941054177.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/28816803123.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16135f7c3666b0---vafewukajon.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/pijodibovuka.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/2240501.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/dolavez.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/dqeh06gn05qns92jfijmcjjvj4/fajel.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/teluzatedumov.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/8100464978.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/23816876291.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210917062518.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613090e54b4a3---53821778394.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=psychosocial+development+pdfPDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/75663318263.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_off0000e292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE292 16704 bytes
SHA-256: fbe7b50247ffd7c68a7ce617cd62b73e395885f064b88d3f88c94e7920d5966a
font_01_sfnt_off00010cce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCE 10964 bytes
SHA-256: 7df952136ec45cdd93d524d099100e3eebcd4c0eb80abcb187e9653713bec785
font_02_sfnt_off00012621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12621 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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