Malicious PDF — malware analysis report

Static analysis result for SHA-256 c058fa80ae201d7f…

MALICIOUS

PDF

86.0 KB Created: 2021-06-25 00:38:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 7d93aa72d262902d94d7e81ed8520fa0 SHA-1: 4f501a3b2aa54a695eb64ca848dad73caadd9195 SHA-256: c058fa80ae201d7fe18600bdd001aa72c8fc8bb118ab9f437adf057920978c05
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple potentially compromised websites, including those hosted on disposable domains and WordPress upload storage. The embedded URLs suggest an attempt to lure users to external sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e1f5bc35c---69913623544.pdf In PDF document text
    • https://betalinktech.com/blmedia/file/raxopavufawosazisiwimi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987184565fd---juxuwinufukiperar.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/79108702926.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/senanovizepijopodutikikit.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/27df59432191c6077e95e705fba6b13d/kanumuruxijavi.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/86790694064.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160941f3b913d6---wuloranilapuvefuvaleguri.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca18d26752---83431920672.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/34411372976.pdfIn PDF document text
    • https://aviseco.ro/userfiles/file/33893660169.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/lugonomavodepakiluwixilo.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/31312715883.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/zenajukaxidaweza.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/p10rue1ib1254ppbrjgdq0gp50/wiberopovafepimes.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/zodesuloj.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/58eb3030ee42455f45d038478f32e589/38095587747.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=interstellar+theme+keyboard+notesPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C2 2900 bytes
SHA-256: 91d8ccef1e1b37896c1c2596ce486a989e23348a911cc7e0ec0aef1394a952a6
font_01_sfnt_off00010d1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1D 5308 bytes
SHA-256: 05f821f823463a38b48f115233b14ef369050e520238956b57245ccf8b34dd2d
font_02_sfnt_off00011efb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFB 12772 bytes
SHA-256: ff564ceab91f8e18c8cb23de59b6946e3fa2043e80da007be95e15f55ae9833f