Malicious PDF — malware analysis report

Static analysis result for SHA-256 d605c19bfcfaa7d3…

MALICIOUS

PDF

89.4 KB Created: 2021-07-05 12:24:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6a9d2c60c83577385aeb3e65efe27816 SHA-1: 88e59970658b8d7214bc0d4f275084b0669e3d31 SHA-256: d605c19bfcfaa7d328f4b036750715f1604608a5835e65169257a360384d10f1
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress sites. The presence of multiple URLs hosted on potentially disposable or compromised domains suggests an attempt to manipulate search engine results or direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099bd4532581---79213604427.pdf
    • http://box8websites.com/ckfinder/userfiles/files/30788066841.pdf
    • http://springbook.no/files/71759636765.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/607affa66a245ae59aad605bb354a362/penojagadasanamarowelod.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/mi6a5atplmqpn4bf3gqta87jej/tutesemeginugakepa.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16078ec49e9f29---dedugebitilojako.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609a62e66831c---9130982257.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a80a427db4---94421887960.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/04q1jbcsroharrkuaknof8h2l3/53598960070.pdf
    • http://195exim.com/datas/files/meruxazozosujepupifo.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd3ba942e4---71778672369.pdf
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081321dcb454---20335748052.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cad74930509---rotosasino.pdf
    • https://argumentua.com/i/file/tofisapigorugevono.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/rm7ljns4ibjkbt8shvml1grb2t/64402546082.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082e51fd9688---24786854106.pdf
    • http://kielcenoca.pl/files/file/tigijolu.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2437bbfd0---13359573902.pdf
    • http://unionzglobal.com/ckupload/files/77127089386.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9ac7710b6abc3ff66519fbe7c7450521/53985323846.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a367f36b9---bozezirika.pdf
    • https://bataretak.com/img/files/file/94073598047.pdf
    • http://thunderstar.cn/userfiles/file/20210612001428409281198.pdf
    • http://uss100.com/clients/5/56/562308f4da1da23328cfd9e5c9f3e68f/File/20131842943.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=critical+thinking+in+writing
    • 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_off0000fd9d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9D 16792 bytes
font_01_sfnt_off000115b4.bin
2875a0d745b6a47dce320d5a0c4523d1edf6c5631e779abef55a2d1697342ea9
pdf-font-stream PDF embedded font (sfnt) at offset 0x115B4 10300 bytes
font_02_sfnt_off00012ce1.bin
91a13993d1f70c396bd6dcfd718c5156346f8f862719591789426c1cb8b4d266
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE1 16868 bytes