Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b65056b0910a4c0…

MALICIOUS

PDF

86.1 KB Created: 2021-06-28 01:24:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4072a23b03618706c59cca7950e0321a SHA-1: a247d6e310179b4e49a2dc403812d8a7a7cfa223 SHA-256: 7b65056b0910a4c0c812fcca456d39443f7d5b42c5dd2cbdc9aed790449786dc
164 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or malware distribution attempt. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and other domains. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' finding strongly suggest the document's purpose is to lure victims to malicious content hosted on these sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/f3ce38b20a26917c62109287375a398a/96872045739.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/2b6c0869e80046ab056ae8d846b3be4d/zipipibisejagowigugoz.pdf
    • http://rld-carbon.ru/file/tenipulusumiv.pdf
    • http://bezagsecurity.cz/userfiles/26797596639.pdf
    • https://jxloanchien.com/style/postimage/file/malula.pdf
    • http://jinanxintiandi.com/userfiles/files/guzumazet.pdf
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/6972802b0a1dfca9f9bcd14179526608/zukilafed.pdf
    • https://thefertilizerequipment.com/d/files/vemupejuvujitezo.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/eff5276baad1efa56e66a29546abcf2f/zetolopotutivisof.pdf
    • http://akcjonariusz.com/UserFiles/file/40750214498.pdf
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/3nffqkip5cuki7ob3bk1d80j67/gomawibimafijiwipa.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b29ba6eaf86---sinipopitalunu.pdf
    • http://mwflower.com/upimagesfile///39155398778.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607002882ba08---95234311449.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072394d6ab49---jorolo.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/dceqgoago1p012l2cltgh7tr0c/42736431052.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607cce1fe5bb5---dagedakepumaga.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/3r7uim5bbucg3hi8j9tplu06b5/18766243231.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab68956f46---rafomodonoduwafasopib.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7dea7d4bf1a090ba6db12b368d7b1d60/maveketasujodob.pdf
    • https://vinacomvietnam.vn/uploads/news_file/63914244356.pdf
    • http://domholidays.com/userfiles/file/62604057187.pdf
    • https://cristalensi.com/public/File/rugaxolubajixejanib.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16085e4547e146---kepikapaliwowi.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606fce020a327---pevuxesigezadower.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=the+strawberry+patch
    • 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_off0000f0d4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D4 16792 bytes
font_01_sfnt_off000108e6.bin
5d1f1bddfc4c2b146cae76d670724083671fbe29ef9f123af2ca39325240daa7
pdf-font-stream PDF embedded font (sfnt) at offset 0x108E6 16528 bytes
font_02_sfnt_off000133a8.bin
861c6cee586e605b85f067d29a050656029f005dc5120073a8fc3a0a6b39ed3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x133A8 10412 bytes