Malicious PDF — malware analysis report

Static analysis result for SHA-256 8787925a41e6d786…

MALICIOUS

PDF

90.7 KB Created: 2021-06-30 15:58:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 02c0a60851890d25f37410cb1334fee0 SHA-1: 0d50345b0f473cb78684500aa0b7fdd99fc1b66f SHA-256: 8787925a41e6d78601d5c6182b0cb0b0a8ae2244d6415259fcac0a77ea476596
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. The file contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting it's part of a phishing or malware distribution campaign. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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.
  • 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 https://dollarplus98.com/images/upload/files/komezudowoworukone.pdf In PDF document text
    • https://parc-hotel.info/file/59924940452.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160739f7bb1414---75389184550.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/43d502d8df87f1df167758092e48596f/32414869054.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/c3a501c64d57b7a20bfcf23e0958fee1/bebatefelemafeboguw.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/55284167105.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/euvo08s4q1qcd92rehf5840pgl/webujabujuxuxolux.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c48539e20dc---20223107175.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/41651057652.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/39560661469.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/mejisusoru.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/1269637647.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/8d838145046e64c1e014a1c4d9227490/71491554478.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d798715324---xanosebisitoruto.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/5daee5806ee1678f7565aaac2e7555c7/73927164315.pdfIn PDF document text
    • https://emprenderem.cl/files/zokuzugigagetet.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/88532336085.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/pekijomidiladeketasan.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/71097780527.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/270828278364.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/gudizafu.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/4817772067.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/xuxizaforagimasowiwutoduj.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16079ef992b02b---44613360071.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=birds+of+a+feather+meaningPDF 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_off00010280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10280 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011a97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A97 10808 bytes
SHA-256: dd4f1c5e8bef779f9965e9faf4d87b4f80e8e1a77cc491b6759f57ba8e8b5ce3
font_02_sfnt_off00013321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13321 16376 bytes
SHA-256: c03b4fe5691d1842811a7ad7e7ed7c50c508053748a93c278d306bd1cc88b6a4