Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3dd01f8b67c3437…

MALICIOUS

PDF

86.6 KB Created: 2021-06-25 22:04:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3bbda17276bb49fd0d32733fab4c9c73 SHA-1: 7450e1da2cf179ebd0911ee9088dbade97146c76 SHA-256: b3dd01f8b67c3437637e3e9efa28dd03c060f541c92b9dc7c80b56fed1a4c7d8
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farms pointing to compromised WordPress sites and disposable hosting domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://garglob.ru/uplcv?utm_term=how+many+calories+in+a+glass+of+prosecco+wine
    • http://anhuifan.com/upload_fck/file/2021-6-25/20210625045851811974.pdf
    • http://www.fonfe.com/uploads/files/86513397389.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085178ed3a27---xelozoxitunewidunix.pdf
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/ruqgavselbvee9fmm7trmt97o5/lonalojezexufakakevo.pdf
    • https://maility.pl_adresuserfiles/file/pevisimazifinukananonaw.pdf
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/ljomj9abit9cilb6acnjqkqcqc/49208515104.pdf
    • http://ozdoby-betonowe21.pl/Upload/file/sunuk.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/15rd016gjgvdm0dhanv4q2fqbn/13324978116.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/90164962508.pdf
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3063ee20e---wamijadokenonabagizu.pdf
    • https://www.groupenahno.com/wp-content/plugins/super-forms/uploads/php/files/rvkjm13teoa48djq6lthm6341b/87594536328.pdf
    • http://chiangmai-clean.com/user_img/files/83201204003.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b4406e04e96---bawunuwomugaloveso.pdf
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/a542dd5b37ccc12f5aa13b664fb33eee/52851359558.pdf
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/jpbtv6maahslvu5kcp1p2kmco7/nazivapelapuzag.pdf
    • http://skogsformedling.se/bilder_umeny/File/64181061188.pdf
    • http://stylekd.ru/files/wobodag.pdf
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6a831ef42---2648787809.pdf
    • http://cascinamana.it/userfiles/file/89938619615.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6d8aeaa0bc9d38c3ca19f1b030d558c9/69540377844.pdf
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/e181daa2fa83ae47a0c248498207e6d6/50620569404.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/14cffbe33bd1b61c3dafb13577bd822d/38359211549.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d0df8f32b---95731821397.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2ea2c59ec---gamexujavetopabe.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_off0000ee5e.bin
b69c54b247b88b00a5aa93b12eec4b8a8d80d64ad8066cc938ea0cc521ce5188
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5E 10916 bytes
font_01_sfnt_off000107aa.bin
6f9458e2162d3675cd588fb351c16630eb4331f00a96f4507f565d53944529bc
pdf-font-stream PDF embedded font (sfnt) at offset 0x107AA 17476 bytes
font_02_sfnt_off000134e0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x134E0 16792 bytes