Malicious PDF — malware analysis report

Static analysis result for SHA-256 f580c47c166aad0e…

MALICIOUS

PDF

92.7 KB Created: 2021-07-02 22:28:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7e8b1708e928609be8be1c684ee76b36 SHA-1: 6480141386dc8c8e86fdeede83d96b7dc1cc8209 SHA-256: f580c47c166aad0efd034411fcdfd16512041eb99dd63add7887d71a4eaedd0f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised websites and link farms, indicative of a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://smidgel.ru/uplcv?utm_term=most+successful+high+school+dropouts
    • http://www.anclupnapoli.it/userfiles/file/tuxozigovuka.pdf
    • http://phannhan.vn/files/usersfiles/files/91871215639.pdf
    • https://lasanisports.com/files/jadafe.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/e7c686442f5bc97116c0ad91758605e2/tolokevififatuxi.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/4ok4ptumme7ohao8m3uo7933c2/kubasejolifijefi.pdf
    • http://myconnect-thailand.com/image/upload/File/21415768904.pdf
    • http://wisdomtours.net/upload/file/siletatefiwagamijozu.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/3jvcq2ctih0d23ipof9kmots8i/nulezupufagez.pdf
    • http://drapikowski.pl/uploaded/fck_files/file/57234160974.pdf
    • http://szentimresiklos.hu/upload/file/fusogemagefipinewe.pdf
    • http://championshipsportsrings.com/clients/23492/File/wadunow.pdf
    • https://aymexco.ro/ckfinder/userfiles/files/26892836492.pdf
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/f3o6tkjnf3ov9824ipmgp7lhf2/20808752516.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/4e6be6940f1dd4894b88a1943fdec843/58446977400.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/735c9c71415304d5820089f92a398b40/23057832129.pdf
    • http://dianacb.cz/userfiles/file/bipepewotemilega.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/23e8ca0c71042b371b911336d6766a63/42265769004.pdf
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/a541a5322cda91daf6920ce2e825b894/nizeve.pdf
    • http://adance0112.com/upfile/editor/file/givakodusawumabefupajo.pdf
    • http://stl-hk.net/userfiles/kumunogo.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/992f2eb0b0e012f8f8c68d78a3246349/vaxinasokepepumesazekejuf.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/667a182a41bc92717102057b0b9441d0/rakudu.pdf
    • http://coytex.net//ckfinder/userfiles/files/26506425175.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/bbm5kl5dse11jkanoefvqseu31/10311120232.pdf
    • http://aelma.com/sites/default/userfiles/file/gozakojokijijebipadita.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ab8.bin
1b2e901a36dd4662d4b6cacbe02c1a313ba733737e7a424f0a0ea5192e243077
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB8 16312 bytes
font_01_sfnt_off000134f5.bin
7f4aa4654ab9889518887fc6014d4baa7ff30fede9ded9929175bd1c66d8e047
pdf-font-stream PDF embedded font (sfnt) at offset 0x134F5 10724 bytes
font_02_sfnt_off00014d8c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14D8C 16792 bytes