Malicious PDF — malware analysis report

Static analysis result for SHA-256 40a57c72183c98ee…

MALICIOUS

PDF

82.3 KB Created: 2021-08-22 01:06:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ce1f5c745e07b1032fc663f7c5f7c841 SHA-1: c2c03e0d668efd727e6b8a70299239ca29ad4b53 SHA-256: 40a57c72183c98eee56cb75594a140efa99afc4bfba4105f2875d171405fb7e6
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristics indicate the document functions as a link farm, pointing to numerous external URLs, many hosted on compromised CMS upload directories. While no scripts were explicitly extracted, the presence of PRC/3D content and the overall structure suggest an attempt to redirect users to potentially malicious sites, aligning with phishing or SEO manipulation tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://handbook.hu/upload/page/file/romefogigofaxizunuba.pdf In PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/f7lqhvh67sookt6fl42cspq8a8/jezepetaxemidi.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/bc3f9135f49650c44df27df76ed0cd92/fegadirapidubobibuza.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///gisimimazurovuniziduduwu.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/wuzewevases.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b7e1a4210---fuzaxurupilila.pdfIn PDF document text
    • http://vincentpopetutoring.com/clients/d/dd/dd6b7bcf94cac99d3bed97cf8166637b/File/4293570773.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/2rfnjnrc13c3h39anpvt7kq03l/wetozolisuz.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/080e35b0qu08ro3acvnqnc5cbd/kavuwagi.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/lijunexivozumadasuxizu.pdfIn PDF document text
    • http://dulichgiahy.com/upload/file/61556182785.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db5d2bbed63---xejamepozesinavi.pdfIn PDF document text
    • https://tuvanthietke13-5.com/webroot/img/files/xixaf.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b98c4356087---jenotezo.pdfIn PDF document text
    • https://parc-hotel.info/file/41208143793.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/99th55a9avp10fgmq2krcgnce7/fuxudarovekudevota.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/9l05i7nfpe31sv0d4ccnblece3/40933233852.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/53396358753.pdfIn PDF document text
    • https://radio-aurea.eu/files/file/botidemininofinasini.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/56965310861.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/3daqvebnmfdm0dk7i7npukmo7j/fumemusumemew.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/52200723291.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=substantial+synonym+meaningPDF 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_off0000ded2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED2 10780 bytes
SHA-256: 58922e6b85eea9562ca61ddc830dfc0da17f9bbc9d47bf250f96e17d3a0d7008
font_01_sfnt_off0000f7ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AE 16192 bytes
SHA-256: 9c20f8d0a8d609ae49ff95617ed36e3ca2ea6b8fd5c7c5feb8a12f33781e6d73
font_02_sfnt_off0001216c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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