Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c0135c0ece9d579…

MALICIOUS

PDF

71.7 KB Created: 2021-09-04 09:07:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a4b71f0c6b7a86e12084586ac0ac800d SHA-1: b22c243c5c9c5b32999337f3c80e3bc79fa03e6d SHA-256: 3c0135c0ece9d5792ec85256340b3f389f864d085b741d2e130bcde4dac055db
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2f2ee2ade---47446767310.pdf In PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160911843c5d28---71169696606.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/1qdn7qlchoqevailrd4csbn5c0/74945033165.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/tikatulifirixavatimumijak.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/fjkj6l0hcb34eusjcd8f6vj3av/38456764301.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/duluposuvijewowigexojuki.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/11055995142.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/ed2aa2e165d6952280de0de849fc93e7/zofuxepaxo.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/f14c2149861ed9e7fb08aa46b4156a87/gizakisizuvudixugibab.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/roxisefiwolabeg.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/pedejuduvanuzorekemipi.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3b1f1839e0---81566144896.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/56349364757.pdfIn PDF document text
    • http://xn----7sbabjkhbzbqti4a3apfmdd2s4b.xn--p1ai/ckfinder/userfiles/files/234332500.pdfIn PDF document text
    • http://hersheyhigh1981.com/clients/37302/File/bilawevesuga.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/gapuwozowonedetave.pdfIn PDF document text
    • https://mimpidia.com/contents//files/meviwivapetoninijitugum.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/74001563384.pdfIn PDF document text
    • http://fkhd.cz/data/img/19783794831.pdfIn PDF document text
    • http://www.alborada.es/ckfinder/userfiles/files/wurodepifololododisotirub.pdfIn PDF document text
    • http://allivecoat.com/userData/board/file/xenekoju.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/54359283284.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/6437448d8e6c2bddba399eeea333d56f/mujuvibemefoxuxodanivij.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/jopapavura.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/39989040037.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/xipibonozili.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=thomas+troward+the+creative+process+in+the+individual+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_off0000b921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB921 11100 bytes
SHA-256: e042e6fe2c8593aa7f899e83a12a4ebef78cdba07ef8f3b96b5d1f422c18aa9b
font_01_sfnt_off0000d2e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E8 15048 bytes
SHA-256: c0d9b47324dfd0e22698ee7d21640a4e349307bceb83da86e389af60acf81572
font_02_sfnt_off0000f874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF874 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1