Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c073ecd814283e0…

MALICIOUS

PDF

78.0 KB Created: 2021-09-02 15:15:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cc6698576a9d42795af58312e01fb7c5 SHA-1: b1dcff3f5fe406b8c5ead28d043bfe3a87b767a1 SHA-256: 9c073ecd814283e0e38b45d87049ae8a689248999f263203838032528ff9eeb8
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to host malicious files or redirect users. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. The presence of embedded URLs and the link farm structure indicate an attempt to lure users to external resources, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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 https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ee63ac8e1---vunodezidixotumis.pdf In PDF document text
    • http://articolo17.it/siti//usr/foto/files/85307552468.pdfIn PDF document text
    • https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/corbvgsub9e3ut9gucrt02puj5/52456708033.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/20461651921.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/6293948665.pdfIn PDF document text
    • http://isemya.by/modules/ariol/static/ariol/ckfinder/files/88886939161.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/58606659687.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/87af5b9a18a62b3891f7bbeb789046f3/nelapisekopefekibuxap.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/75491446962.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/vimegi.pdfIn PDF document text
    • https://coatielectronica.com/files/95840766682.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/30781779955.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/jizobafitabesimupo.pdfIn PDF document text
    • http://kustari.net/userfiles/file/nekexukizunagokot.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/sutiwu.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/25954986511.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/lusilebef.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/c7e313b03e4e6e7e0444ccd67cddb4f9/fuvowarimemot.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/cb196a7ad654645c1694f872877bb815/jidotav.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/bozuzovodejutes.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/df45rkcm51aa6fnumernn031jd/mitukubedikorugedomanofim.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/20134787380.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/39959788096.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/61520644417.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c698b8c1cb---xinajo.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/namiteb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=magic+quadrant+for+crm+lead+management+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://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_off0000ca83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA83 11032 bytes
SHA-256: 6ccb7f64594062c3b91ec77064d1341d0af0482513781f1d20a1ac466d03f318
font_01_sfnt_off0000e3a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fbbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBB 17648 bytes
SHA-256: 1474848f5e03d8fb6523e422d9bfcc7cb96720c7d3b9508c24d248f43a1504fa

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