Malicious PDF — malware analysis report

Static analysis result for SHA-256 c004d91eedaa6dea…

MALICIOUS

PDF

69.7 KB Created: 2021-09-22 22:34:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 14a291cdec1ed69b7c0a86cb1b2031ba SHA-1: 604cd1858860d25de84b7fb2a9c164d957138057 SHA-256: c004d91eedaa6dea307ac8c607da1bbef85a831ea3c2d369bbdf20c2e369e559
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that redirect to external sites, some of which are hosted on compromised CMS platforms. The presence of multiple external links and the nature of the detection suggest an attempt to lure users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://everestart.com/images/stories/file/49413080371.pdf In PDF document text
    • http://abwhopewell.com/uploads/files/safute.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/dcmocgfnotlk6v8fujinrk2lj3/55492278737.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/21950450870.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/nebarani.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/92703276492.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/motinidirukusuwenifuju.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data/files/24526020989.pdfIn PDF document text
    • http://erfansari.ir/ckeditor/files/files/xareketaxe.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/pewubamulufitik.pdfIn PDF document text
    • http://louisamerino.com/userfiles/file/kuxirimomuga.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/xadusebituw.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/89326858000.pdfIn PDF document text
    • http://casms.org/atts/news-files/file/jolatodetunivufesomev.pdfIn PDF document text
    • http://accronline.com/userfiles/file/49767808902.pdfIn PDF document text
    • https://doitoutdoorz.com/file/asckGFWsaZBFgvwc.pdfIn PDF document text
    • https://pima-alarms.eu/slicice/file/87023427028.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/161435e1670bb6---14286315111.pdfIn PDF document text
    • http://henca.com/files/details/file/42699710502.pdfIn PDF document text
    • http://airfa.it/userfiles/file/81990441367.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131258f5a538---viwoxe.pdfIn PDF document text
    • https://igraonica.me/userfiles/file/xesalukobo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=phone+screen+broken+transfer+filesPDF 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_off0000b2b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2B3 10664 bytes
SHA-256: 7955335cf21b2b9dd62bc08b64f3bc5e244f3c38e37f191975c7a8b7b63f90c3
font_01_sfnt_off0000cb14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB14 15096 bytes
SHA-256: 7b945cef7a07d89a88d2fb4c6d093ef9d396eabad0e633a6602cb9e5968103ca
font_02_sfnt_off0000f157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF157 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1