Malicious PDF — malware analysis report

Static analysis result for SHA-256 691cbe932299e2b8…

MALICIOUS

PDF

85.4 KB Created: 2021-07-01 13:15:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a014d673d5c5db3f736aa5315c649a9e SHA-1: 51db4c16c092cd771b28f31288c29e7c2eda2766 SHA-256: 691cbe932299e2b819e31deaf30365fc6bb32d6e7867d7f5a1dd6eb739a70611
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to lead users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607964311ad03---jolufatu.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761ac33ab6a---xuvugosixixerupol.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a78c1a07c---85945849015.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608cddb4a308e---6132569105.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/d156a467ff7c0082883bf16a71687e8a/98104951992.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609804954f14d---76674981256.pdf
    • http://chatfieldfarms101.com/userimages/banumapasibowofevokijeb.pdf
    • http://steakclubhn.com/campannas/file/vewilobus.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c65cc64f76---99059944450.pdf
    • http://vyveva.eu/UserFiles/File/7015013730.pdf
    • http://hongshengfish.com/uploadfiles/20210517/210517054240710030k3dxgu18j56n.pdf
    • https://echipamente-scule.ro/userfiles/file/kifobukuxagigalebakusazu.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/kfhl2u47fadurf0gbkpnhlfd11/11738706355.pdf
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/3be71acd5a0505c30c67856bcb654917/54417421576.pdf
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/0d58a4e3460b773847e469f63934434e/24156482555.pdf
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16095094fd2058---61223169063.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2fd24dfe2e---mulipeboxumilujorubukenu.pdf
    • https://ms01bet.net/contents//files/segesomopusewuxonabapig.pdf
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/jod183220rkp1jh3civ7g0tafu/zabibanawi.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a14baa7d24a---jogemudidurexo.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160900dbc84266---65991787464.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=candy+crush+hack+apk+unlimited+gold
    • 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_off0000eb0d.bin
45a6c2483938be6119bfab45e1c5742e2d81bf15d51896b52c5f4d3e4738f3b5
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0D 16612 bytes
font_01_sfnt_off00011658.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11658 16792 bytes
font_02_sfnt_off00012e6f.bin
a85c543f08ba625137dc84fe747cc7015c2bfb5d3f22b28b49c815b07e316fb1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E6F 11296 bytes