Malicious PDF — malware analysis report

Static analysis result for SHA-256 86f785050890c4ef…

MALICIOUS

PDF

81.9 KB Created: 2021-06-22 11:54:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 97ecab536fd52e9f10efa8848c5093b7 SHA-1: bf32c435e517509d7321dfe95a34df2f8666d8eb SHA-256: 86f785050890c4efc7a14680550bf4190ee3602cda9f171884bdca2d94c525b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS upload directories, suggesting a link farm or phishing lure. No scripts were extracted, but the PDF structure and URL patterns are consistent with phishing campaigns aiming to redirect users to malicious sites.

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 https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/4dnp5jqu0v251qgdqi2g8gis08/lokaturijipigumoxad.pdf In PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/nq1q1b6sm9mhs55h0ht0209eb7/monofotazewisedigujopepu.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/b302136e85daea72f494e5ba039fa564/67440315988.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/510aa9ff74597afb0da50d4efc70e884/35092057742.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16072d324dcfdc---rujelesanikasirubak.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/da899603f4ff81354ccfd9df31d235a1/piresakedajenapelotijazi.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/t666ob8testvk8jh75h51t033c/12832644160.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/ptiatib5fv150bj079nc0uki44/puzepozewubiwusuxuvonivu.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/cc08a15b4e8739c90dd35d5c5f1b7aa5/nodewidevububefuniwak.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210505064910_363218792.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/biwife.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/muxesoxiduzupamop.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/315d2cf3a07ec337e7f6deeb0c40665f/sifetowuvarapozemafopa.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/fuwudamewunizulimetujatov.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/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=sous+vide+beef+time+and+tempPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/3ab8948cb098ad103aae3bf62dc5cc6f/satasosefo.pdfIn PDF document text
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fedc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDC 5364 bytes
SHA-256: f4b2c13c65b39edc526d3b22f78124e38807fe53dd56965e23aeb491e256cf23
font_01_sfnt_off00011108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11108 11880 bytes
SHA-256: 0b0faaa93f575a2846bea5ac5791401b72b3f3943763a139f6d06a88ab1f1a0c