Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dc8e685de225b4c…

MALICIOUS

PDF

86.5 KB Created: 2021-09-07 14:45:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f6c1a679b245b179030e4867fcb512f0 SHA-1: 48bc7a2674af261ba639c369e42aa0335593b6cf SHA-256: 8dc8e685de225b4c44f15303b3d1e74c55164cb7f82f75da3dacad187331e1a7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various PDF files hosted on compromised websites, which is a common tactic for phishing or malware distribution. The presence of multiple links to potentially malicious PDFs suggests an attempt to bypass defenses or distribute different payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9056f0b581---bebalisudug.pdf In PDF document text
    • http://immopolignano.lu/images/basomijutevorilefej.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/lozemivofibabowawile.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/05164f2fc53ee3fc28765b4425dfb290/lelene.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081598ca4589---9509698028.pdfIn PDF document text
    • http://cocoal.com/uploads/file/3833455772.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/13363250938.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/kamisinudi.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/93c4948bf3fdaefba104c779bf74254e/zepijofanaguvagatanonelu.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/gajagidumoxelejurezaraf.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/oago98hempbf29dh82g2a9v2mo/tijoleferafaworina.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/9c6f2c9c2eb0ee51c69af630061dc90c/364210564.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a450f22383e---rafun.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b0b969ba4---favutipafapevunaw.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ca27a4c1a---xumakavo.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af96e472603---53915455648.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/c38f6b7e7bd8cbfa8a69ddc0b0725fa6/jiwafosuxeja.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f650b1ca9---woralowowujirawezafo.pdfIn PDF document text
    • https://amgaa.org/temp/files/38817215544.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/53093399754.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be46e2b093e---33572712127.pdfIn PDF document text
    • https://firmabudowlanawalczak.pl/web/uploads/files/40869140250.pdfIn PDF document text
    • http://cochu.net/resimler/files/44065148358.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=pdf+editor+software+mac+freePDF 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_off0000e812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE812 10572 bytes
SHA-256: 6e9aa8b5c2c2b8765e73a0e8247ef8bab400bcef28b93742046d14d796ba348a
font_01_sfnt_off00010055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10055 20244 bytes
SHA-256: 71077a20449077aa67606dfe47434f64a70fd434f8b04de3d4b7ff00b2a241df
font_02_sfnt_off000134b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.