Malicious PDF — malware analysis report

Static analysis result for SHA-256 61fd7a9eec4ab882…

MALICIOUS

PDF

84.5 KB Created: 2021-06-28 03:49:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 46bd544153d2660776315838e15d7bd9 SHA-1: bb21cf9aa482f90e589a4baeb4cd146c97a065c2 SHA-256: 61fd7a9eec4ab882286e6b9c2e1b9076cfee24341237fa9228553ff2f963b815
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous URLs, some hosted on compromised CMS platforms. The presence of embedded URLs and the nature of the heuristics suggest the PDF is intended to lure users to external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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=iconmania+answers+level+2
    • http://www.ferm-matic.fr/upload/file/lenutovajilukaxa.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d3f1a2110---90601674892.pdf
    • http://shengnabei.com/uploadfile/file///2021062513252990.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0c02db083---xumiropudozolipajijube.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1606d903b52340---69658186336.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908ea3cfc75---rodozeje.pdf
    • http://ausafe.net/images/art/files/8087743298.pdf
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/1665593b3aed346f9c341587f52c4917/47406896646.pdf
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/74c278809485910796e3b67be494887c/womipexiwasidebopojinugol.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b22dcc203f0---dexoxadadumigevazu.pdf
    • http://aggengr.com/uploads/CMS/file/33190881252.pdf
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/ed2aa2e165d6952280de0de849fc93e7/zofuxepaxo.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b8591db7b3d---80957111536.pdf
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/vuzofe.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a93e041211a---fadadabevowulofapewu.pdf
    • https://itexpertdog.com/upload/files/zelatuzosovotij.pdf
    • https://workinhotel.com/upload/fckfile/sezezuwego.pdf
    • http://df-foundry.net/d/files/joninimetitomoz.pdf
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/licngk633c4ttr9ual3tjm33i7/zimebezewu.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/4f722807089beec901b6e489e65679a8/94760093517.pdf
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/bogl4pt72hcmtq6irn6bcjr493/fosizukekaxatis.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160949377ed616---56067512839.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_off0000e202.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE202 16792 bytes
font_01_sfnt_off0000fa14.bin
1e370b01c5be0ebcc7c32b970b660f845576af7d660f65a092f0fe16375d8088
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA14 19080 bytes
font_02_sfnt_off00012b71.bin
e6afa500ef78dadd311c227bed4e95390bb42e5c95562ed24744024ec0173842
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B71 10516 bytes