Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b69c246c2babc8a…

MALICIOUS

PDF

92.4 KB Created: 2021-07-08 03:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3cb330faf2ef0a7e6d5409a130ddd063 SHA-1: d3bfb880c8f21ecc868f78f348984d268c6088a9 SHA-256: 1b69c246c2babc8aa8c67517f8db8c7e6d7e5f56a9cd46b9065e4a91fcf7020f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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 http://brenno-tojestto.pl/userfiles/file/wumerururebodujelaxuzizan.pdf
    • http://ei-windykacja.pl/upload/file/rerowop.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3f205b2ef---zupekufugoluzepewij.pdf
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/51516103784.pdf
    • https://locktactyuma.com/userfiles/file/7653623910.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/cae78ced3d3a38ff92c69acfe9f1a165/fofenopobevotonusekaw.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6beaedd43---bokuveruwakomike.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609882c6ce2c5---sovugupilomoneminitena.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/6c50cd8ba277fdc2342d2a61ba73eef4/dipefofogujifolu.pdf
    • https://mk-sito.it/uploads/file/kuroduravito.pdf
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad780639826---rixidoje.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/lopuletujajetejoteje.pdf
    • http://www.thaiboat.net/image/upload/File/56727331023.pdf
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/6bnki7hkv0j1oe4qc8kih8dvo7/49956601986.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ad88d714a7d---31416289990.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/3o8truprge1tlmkqeitba4tjjd/20547926835.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160aa31817af7a---42804004171.pdf
    • http://wo-kop.pl/userfiles/file/13235930831.pdf
    • http://snap-drone.com/userfiles/file/sasafef.pdf
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/7d41db697319bc413d300fc08059fe75/74403036502.pdf
    • https://alrukn.co/userfiles/files/85927487216.pdf
    • https://www.myosiaffiliate.com/199trust/img/file/61324222614.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0e0d0115e1---88813028374.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/d6d2jng3sdd4bco8r4sopbrav4/31209266933.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+make+chocolate+whipped+cream+with+melted+chocolate
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f09f.bin
7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
pdf-font-stream PDF embedded font (sfnt) at offset 0xF09F 16312 bytes
font_01_sfnt_off000106aa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x106AA 16792 bytes
font_02_sfnt_off00011ebc.bin
17264fd4bc49c1ee76da19e8952a0bc65d85f7fcd146e49bd228da978358583f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBC 16980 bytes
font_03_sfnt_off00014ad5.bin
1789c747b055f66e1b780bd27b90909add65b814696590f0d178514311dac874
pdf-font-stream PDF embedded font (sfnt) at offset 0x14AD5 10676 bytes