Malicious PDF — malware analysis report

Static analysis result for SHA-256 764f559b52d4d066…

MALICIOUS

PDF

87.1 KB Created: 2021-09-13 15:26:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fe1593df8d3ca8ad3a0618ce09bed627 SHA-1: 9177cec13dbf11450f234a40f48a4451173c1cd7 SHA-256: 764f559b52d4d0666c87f709d966db26e6c93a2088b0745fa2d02adf151b2b6e
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to compromised or disposable domains. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://eguiders.com/uploads/72318376773.pdf In PDF document text
    • http://dinhvi5s.com/images/newtech/files/9912107222.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/gevanuzodikexufezaz.pdfIn PDF document text
    • http://cascad-trans.ru/files/67570068106.pdfIn PDF document text
    • https://12shio3.com/contents/files/lomujitoxelal.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/87410473262.pdfIn PDF document text
    • https://factorysales.com/userfiles/files/komegudadomakuzem.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/18998133567.pdfIn PDF document text
    • http://nwatchonline.com/userfiles/file/5101241707.pdfIn PDF document text
    • http://shoreluxurylimos.com/userfiles/files/jegifupowefujile.pdfIn PDF document text
    • https://izometal.net/mm/file/12947927931.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/tibudemisomasisu.pdfIn PDF document text
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/sesapupadinuke.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/1439851156.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/32587946021.pdfIn PDF document text
    • http://www.seminariomenorvalencia.com/admin/lib/ckfinder/userfiles/files/92200800083.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/sumajoxuvaxebibokugime.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613727a187d3a---31654960975.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1612f37257133b---34254982477.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/4010726067.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/80231484766.pdfIn PDF document text
    • https://lidiyageorgieva.com/ckfinder/userfiles/files/13604996384.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/30901086705.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/sotarijilenopuduripijuru.pdfIn PDF document text
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/bumovezi.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e192810ee---42241387438.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/38520621040.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=which+is+the+best+notepad+app+for+androidPDF 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_off0000ee5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5D 18056 bytes
SHA-256: 0da9c6973dfc07caffd60ee1c1756c1d036f0f4c88ec317576649ca3a70bcdd3
font_01_sfnt_off00011d40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13557 10804 bytes
SHA-256: 795b1c226e91c2ec6fa01b5b5642614d3f224d53fb93209f6b9a6753d7dbec8a