Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bc26dd41b124bad…

MALICIOUS

PDF

85.0 KB Created: 2021-07-21 19:09:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a92254b1b6602e3a93000b2b6fb7bf22 SHA-1: 24ace71698125d65d90320f07e19656d74486b28 SHA-256: 0bc26dd41b124badf70970086dbd9c0f42e54f5507c30301ee51e43b0151c9c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains a large number of external links, many of which point to compromised WordPress sites hosting other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these linked documents. The presence of link farm heuristics and the nature of the URLs suggest an attempt to leverage SEO or compromised infrastructure for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/r68kvubdv0ua63losv42dirb6j/kekuzopenezo.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b0946a00ec5---86869342168.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160796bf3e9b70---mupowavuzixuvadejerigeg.pdf
    • https://cualuoihoanmy.com/uploads/userfiles/file/ligib.pdf
    • http://castrolmintabolt.hu/images/upload/file/viramezupixopazofejo.pdf
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cae89dda05---gepisikalojujuretusesor.pdf
    • http://exosushi.com/uploads/files/93589114159.pdf
    • http://goref.ru/files/file/kodoxezekajikawogogapaw.pdf
    • http://am-assets.com/aom/magnolia/userfiles/file/pupad.pdf
    • http://kingsfinancialconsulting.com/userfiles/file/93421695781.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/qttidsdes6iri6lkul3livtll6/97634441616.pdf
    • http://whs1963.com/clients/7/75/758a827d59fb1c2827eec60421ffdc22/File/10497725379.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a6592f1c1---nenebaxi.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/24031d9171b786c0c5a5bca7d633602b/31153185035.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/88affd93b41787713e25dfb7beb86a7a/85178882506.pdf
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/19749365644.pdf
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/rsdrahnd00ffrbism2vrnc4md0/xedarasez.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609fbfd511696---zuwidogiledilukijagi.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608173a4e98c7---49854467398.pdf
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/ssa2tk9sbebsin8j8m3sbllvb1/38719338715.pdf
    • http://duocmyphamcongty.com/app/webroot/uploads/files/96717386611.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16072628eb56ca---tunibozukebeda.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=equation+of+line+in+two+point+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_off0000e8ec.bin
6e4cc464f18db1051eebee094af1f157c85cf59b57fa8bf413564bac8e28cc3a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EC 17112 bytes
font_01_sfnt_off000115f9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x115F9 16792 bytes
font_02_sfnt_off00012e10.bin
7247d20d2caa1388b2636da7ea7df710556a5e3122b34114288f80b10790ac37
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E10 10664 bytes