Malicious PDF — malware analysis report

Static analysis result for SHA-256 5abc2dc2690bcbd4…

MALICIOUS

PDF

82.3 KB Created: 2021-09-06 01:19:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 006b83a2bcda65bb1245234e6cd4841d SHA-1: 90a6d967976d83ea3fbd038724b6c09444c66f5a SHA-256: 5abc2dc2690bcbd4f4d13554cad3d24cb1dbf9aa056f33b8351fe289d408f6c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites hosted on potentially compromised or disposable domains. The presence of numerous PDF links on various hosts, including those associated with compromised CMS uploads, suggests an attempt to manipulate search engine results or distribute malicious content. No scripts were extracted, but the overall structure points to a phishing or SEO poisoning attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://airflow-skateboards.com/upload/file/zuviberenigonaromalim.pdf In PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/3d18179043231e56f7dd195b3390dec0/79632406053.pdfIn PDF document text
    • https://alkirbilaw.com/userfiles/files/57890331818.pdfIn PDF document text
    • https://www.propertyadvisersaustralia.com/wp-content/plugins/super-forms/uploads/php/files/07622239bf17f004ddb5b19851c8ae53/kasejoxaviwari.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fda581cabe7---10740697332.pdfIn PDF document text
    • https://samowar.me/userfiles/files/jipelonunimifewozotisese.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/42015116248.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/bffihv0489mkbm1rck0uoc3q55/31600346443.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/73284585385.pdfIn PDF document text
    • http://guilfordvikingsclassof81.com/clients/4/47/479b0a304b4cdce99dfe3eda73a59016/File/41467144167.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d06aad832e---minerururudasavesof.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/0b1eb2a059c2e21f7f4eeaf392d6e7a6/973628040.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/77825688941.pdfIn PDF document text
    • http://cosmeticdermatologymiamibeach.com/uploads/data/files/85031257740.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608773c28f82d---netibikuge.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/5e3ehbi2voftqdgnl3g2sj16q5/vimemimuxufegakewupub.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210601_024854.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/65723061338.pdfIn PDF document text
    • http://photou.cc//ckfinder/userfiles/files/63492760698.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fb3f58fc1---13197861838.pdfIn PDF document text
    • http://soles2walk.cz/data/file/jitelin.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gutip.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16118744cf2ea2---turozukigezovizo.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873f94a49d2---sukavavibetevaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=more+step+by+step+listening+2+pdfPDF 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_off0000dbce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E5 10880 bytes
SHA-256: 9e02131166929e61ef2d989cfe8a96902ccbdb665b559a029c83eba4f397222c
font_02_sfnt_off00010cce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCE 18136 bytes
SHA-256: d4496f238b574e9bedcc6187c327858e8550fbd06188c99cc59576014b44ca11

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