Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e7125d6caa4c940…

MALICIOUS

PDF

75.5 KB Created: 2021-07-04 23:11:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 31f40ccf6404010f4f692ae84931c774 SHA-1: 0662eeb95c7a9fa85581efa782db352149641684 SHA-256: 7e7125d6caa4c940c2330c64c0235e9502626ef666a01614bdaf944753aa19db
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised CMS upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 http://akkoryazilim.com/userfiles/file/27514527113.pdf
    • https://aimhc.com/userfiles/file/porowomuxebineligone.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160da2eb1874d2---38667245631.pdf
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/12ce4d1d7b2ac78f23840d98940a7788/57654582254.pdf
    • https://west-holding.com/userfiles/file/xofizefuko.pdf
    • https://ikitellirezistans.com/upload/files/gepabozedijopekajarur.pdf
    • http://akcjonariusz.com/UserFiles/file/56651771923.pdf
    • https://mavibusiness.it/file/42598063399.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16072ffca461ce---mipuzalim.pdf
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/0a06274202a877f4c887e01ce502b427/xubaxenukuv.pdf
    • http://ipceurope.eu/assets/file/meluvosevoxaliva.pdf
    • https://avigailpekelman.com/sites/default/files/file/53269524216.pdf
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b486acd1d47---96969956605.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/7c74c760a7b095d82addb10dddfe8f56/33212039977.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aea5196177d---notajitugumixufazim.pdf
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084da7c3707b---luronow.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acfef4bac7a---87151304689.pdf
    • http://diamondsnspurs.com/clients/12200/File/zixolubawifaxiba.pdf
    • http://melinterior.ru/userfiles/files/xezisig.pdf
    • http://portalkucharski.pl/app/webroot/media/files/dewudagif.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/47c48fddde7d2c068daf99720a0e7c2c/99073321439.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16081c866b0dfa---sopofowuzavexorutikejeso.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/sjtqkdfgo09rsp647okbn1b7vm/80947531296.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ada0a80eff---57334978520.pdf
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/34bvtrcckjg5gcu660dsp9850p/57923067513.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a45432be220---tipokikuzoxo.pdf
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160733f9125a51---fewumaxixafazifokulifis.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=standard+to+graphing+form
    • 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_off0000c642.bin
ea00fc110c08422dd54362bbf89c64b761f9ff6d9de52e37309faa214e4f6373
pdf-font-stream PDF embedded font (sfnt) at offset 0xC642 10672 bytes
font_01_sfnt_off0000de43.bin
25b835134dbae2185029fa90e16709a3c27bfb9b415cdf68a570abae75a0ff14
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE43 16380 bytes
font_02_sfnt_off000108cc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x108CC 16792 bytes