Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebd107644a3fc74f…

MALICIOUS

PDF

72.7 KB Created: 2021-09-02 15:38:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 7dab85a64a76b4d0f493693def2d485f SHA-1: 9205052b4d8ede9acae08dcf32adf87c8d682bab SHA-256: ebd107644a3fc74fddd0d4854b49b5ca009d88bed463675c065d6f6aec564df4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/7iemassrfed3v9nt02sqelqidv/xedogaxow.pdf In PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/b7ue8634hiqo7pujrmquonlcr1/dazanowemejesij.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/eab9c9d62df80f9b4247a6aa14d9403c/tobevilapemoza.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/xufolex.pdfIn PDF document text
    • http://ducthanggroup.com/webroot/img/files/30231768220.pdfIn PDF document text
    • http://vhshf.de/File/72066300068.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607637423f318---depod.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/75054448205.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/34466081574.pdfIn PDF document text
    • http://olgapolyakova.de/files/files/gukujogetuwajaxifabize.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/9bb8f06511bcc386db94da239ddeeedd/lukaxuxokerixapamuva.pdfIn PDF document text
    • http://thietbidienmpe.net/upload/files/14699162375.pdfIn PDF document text
    • http://sierrahighalumni.com/clients/878712/File/33899641428.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/df9be58047a4a4af3793464f30da6084/20636840298.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/48964223813.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/27ec787b734c20fef3a36b91f0dccbd8/busunuwigileligojegolope.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/vr6g7emhmmeu9ot686pbdphhu4/70557549488.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/kizejowovew.pdfIn PDF document text
    • http://physiotherapy-warwickshire.com/user_file/file/76709491486.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/kewimosarig.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828fdd58197---pamososerizitubupel.pdfIn PDF document text
    • https://santaclara.com/wysiwygfiles/file/taveroleledefunolopo.pdfIn PDF document text
    • http://55thocscompany.com/clients/62662/File/96540528264.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=thyroid+cancer+pdf+2016PDF 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_off0000bcca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCCA 10944 bytes
SHA-256: d9facffde34ed33698a0e0d5a1b6d99ad5a2ff64af373d582620d33cfc2989cd
font_01_sfnt_off0000d626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD626 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE38 15580 bytes
SHA-256: fefcbb3402f20c773ca71ad2496580e17d65c1b81defe4bb1b795d08bfbf7890

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