Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcaaecec81972808…

MALICIOUS

PDF

77.9 KB Created: 2021-08-30 00:14:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: f0ddf576b98c82608e3b2cf35405c794 SHA-1: 940a58f3adaf771940dce3621ae70c9310883e58 SHA-256: dcaaecec81972808c5a6ae065eb26f1a92e214c502fd338d51409ed70f964b9c
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The document body is unreadable, but the presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest the intent is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://hotechike.com/files/files/gijixalijetitiviw.pdf In PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/b79deae2713b367589d746ac5b0dc0de/48710853660.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/ralisogevobix.pdfIn PDF document text
    • http://bouncebodysupplements.com/newerac2c/userfiles/file/18454246394.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a58c23f2ad8---2136027141.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/2216527389.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c36e3cd24a8---63449945924.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/76380384718.pdfIn PDF document text
    • https://dhesient.com/media/fuwokerab.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/818d7efb2a0adc08567a0c9bdef1beb8/36626565303.pdfIn PDF document text
    • http://195exim.com/datas/files/dizorib.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077932bf2cae---15199244448.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/81583160356.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/rewega.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/kunumisepirepupibarem.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/892e91a6e508e180730f974503944769/mitiletelexebofe.pdfIn PDF document text
    • http://brenderup.ro/mm/file/meguwutomotaxefaveguxixik.pdfIn PDF document text
    • http://stallingreunion.com/clients/a/a3/a37dbb3dca22f8cb40f44de83fe48269/File/49922149790.pdfIn PDF document text
    • https://ecoledesgourmets.com/userfiles/file/mipaxevaj.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/14189324214.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160afbf0695104---bumubiluzojetefaz.pdfIn PDF document text
    • http://axwelindia.com/uploads/xepomizu.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/593cf734c999bb0e731912784b8b5bf4/34359821499.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/domaxufizewisiriba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=first+second+third+point+of+viewPDF 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_off0000cc77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC77 17360 bytes
SHA-256: c15dd1e0d8fd1f5b9d939980381b5b6346bcaa2cd5784f948bca02f37b84bff5
font_01_sfnt_off0000f89a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B1 10636 bytes
SHA-256: 77bbcbb448a9f943653b14a9c9472a6a77fff69e669a9b34c4690221f2c0d86a