Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a93cffe2b69324f…

MALICIOUS

PDF

81.6 KB Created: 2021-09-04 22:58:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 898acc05a7b7e81000d452d880c60c47 SHA-1: f16fc3d1507337e09e0069f1a837ad8e96b3bd9c SHA-256: 8a93cffe2b69324f5bda7382dcc4b5abc03e48f3e60f1ddd1f200dcea43f2362
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d121c53a75---sefuwavesefaxonenipojug.pdf In PDF document text
    • http://mya1fc.com/files/ckuploads/files/91448563491.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077932029e65---41977172692.pdfIn PDF document text
    • http://chromatographvials.com/d/files/81296443061.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/6alh4ssaarplnsi7uaq30cr9qa/jubesafujixugonanapo.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16078bc6993ff7---55970358671.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/74293419145.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7e4deb6db---kugiwitukugexapigixovonav.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/rredu7d2rp8gvg5k96pn4noroo/jimatuwusiwobinuma.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f67abebe50---77488512336.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/renowibenirido.pdfIn PDF document text
    • http://kreativitaet-stadlhofer.at/global/images/userfiles/file/xikerudazaxibiwojo.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/242cddcdfc2f9a88d4561ba193872e68/79669387224.pdfIn PDF document text
    • https://justforjetscatering.com/userfiles/image/files/10720105083.pdfIn PDF document text
    • http://icsbc.ru/fuploader//file/62670449051.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/sirabikodewomokuponumo.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/29017952183.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/5b7722aacc91d6ab10b7f936f3349604/nibanekeketavedif.pdfIn PDF document text
    • https://fototipia.hu/files/files/83927046974.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/f431cfd68ce8498a5fa48c84673c682a/54686784974.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/wosekurilujesi.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/72daa018f475411615ba06199ed613d7/24463424316.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/tovuxuwaruxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=engineering+drawing+standards+manual+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_off0000dd07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF519 16468 bytes
SHA-256: 859252955983ef7cd0e15b6eed8995ec8744b1060df204ffffe7e3e2d6962307
font_02_sfnt_off00011fae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAE 10892 bytes
SHA-256: 2aa98261008f45823c24d0dfcb7db200fd164c64be8f5b8a1e8fdc29634749c6

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