Malicious PDF — malware analysis report

Static analysis result for SHA-256 88e4c261d9ed8487…

MALICIOUS

PDF

83.1 KB Created: 2021-09-19 20:46:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 23ce1db64e40ecebedcd72a326413179 SHA-1: 427844a5c21a7388d7eacaf5f378f4f0fb15046a SHA-256: 88e4c261d9ed84879b8932609ab5d392908bf5710150f871a0906596c4fa523c
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress installations, suggesting a link farm or phishing distribution mechanism. The 'SE_CALLBACK_LURE' heuristic indicates the document likely contains a phone number intended to trick the user into calling for a fake issue, a common social engineering tactic. While no scripts were directly extracted, the presence of multiple PDF-specific heuristics pointing to malicious URLs and the ClamAV detection strongly suggest a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614315cd84969---84440695340.pdf In PDF document text
    • https://actor-conseil.com/files/file/96937178334.pdfIn PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1630928735.pdfIn PDF document text
    • https://truckforceone.eu/upload/editor/file/sitotexuwinuzujajom.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161313b83477a3---13104820702.pdfIn PDF document text
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/kuvuxarosekidoje.pdfIn PDF document text
    • https://idosekotthonaveresegyhaz.hu/files/files/rabubebumujigagokuvekeg.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021090422585468.pdfIn PDF document text
    • http://ohxto.com/uploaded_files/userfiles/files/9277439771.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/jvg9es3r5tlubu6nu6nedp4t07/32696402210.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/b49ffbfd9df28ffdc3a8bd6ed4e82651/36293685795.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/61873915114.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161328ae116ad2---xofinisutot.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/47291358618.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/95333133320.pdfIn PDF document text
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/35458034672.pdfIn PDF document text
    • http://coumert.com/images/file/tomakapesitimiderapeko.pdfIn PDF document text
    • https://afritransport.com/app/webroot/files/file/karovujubuwokolibijipu.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/53997284336.pdfIn PDF document text
    • https://novinfasteners.com/userfiles/file/26121097574.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/jurizugop.pdfIn PDF document text
    • http://cobmedia.hu/include/83571118675.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/mesorizejopiwaju.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/17094152610.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/rajuz.pdfIn PDF document text
    • http://ortosprendimai.lt/userfiles/file/29536353274.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=n+letter+things+namePDF 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_off0000df20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF732 18348 bytes
SHA-256: c86141ba1b5df1ab715f5bfed7c01cb9a835a09622370b73109ded628f0ed2a0
font_02_sfnt_off0001270a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1270A 10412 bytes
SHA-256: f73710e58f220f5a4892f89fd9cedfa1320d9f26e76ecf027846ebc510b3a3ea

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