Malicious PDF — malware analysis report

Static analysis result for SHA-256 427c129073a0873e…

MALICIOUS

PDF

101.1 KB Created: 2021-05-27 12:42:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 816723675c9afc5c25a8c9fee38b6453 SHA-1: e4a082c635e08176efa89d4918713483c5bb2d11 SHA-256: 427c129073a0873ef2132eb024fee54485412d5fa5699c7ba6cdebcd25bd5b81
156 Risk Score

Malware Insights

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

The PDF contains numerous links to potentially compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/6e59de40c0b52c10f157922082725ea4/tajum.pdf In PDF document text
    • https://chpcentre.com/files/file/71817577535.pdfIn PDF document text
    • http://liyangah.com/Upload/file/bugipa.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/9derp5n5tentnuvl7udmtacu5e/20191878666.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/69627534649.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/a8480f5a9ea4659d79229b3c35e9f519/zozapezimitarefexisumit.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcd9a2ec2f---ferekogixuletodimovazo.pdfIn PDF document text
    • http://indel.sk/userfiles/file/nobudubinapuwofasobuted.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/81980397571.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0facc68cb---butaj.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/facd055bf78eea394ad80e25d0529ad6/7795921835.pdfIn PDF document text
    • https://noddy.nu/images/file/voten.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/2007540442609eb2d08a857.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16083d0be7799f---makejufubisajaxanolodali.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/tafuka.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef38b77088---27947105811.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/79355551192.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=libro+la+espia+paulo+coelho+pdfPDF 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_off00013d92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D92 5020 bytes
SHA-256: 5bf16dba3bb5b7e7375144482ffb91adea7a1933de3fd3c69614e53bde1104fd
font_01_sfnt_off00014ea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EA2 12756 bytes
SHA-256: 260e24a84a0fa7f97f8ea55f42ace88368416c330450205dc28401e431f816f4
font_02_sfnt_off00017753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17753 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c