Malicious PDF — malware analysis report

Static analysis result for SHA-256 bff7141db2cba37f…

MALICIOUS

PDF

78.5 KB Created: 2021-09-14 01:56:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fb337dcf016f49a9cf1a83c2b7bb74ee SHA-1: 50f021cf8492c37f3cb3240d70e5b0bea68f8afc SHA-256: bff7141db2cba37f7196c80338d489ba0bce8a5ce6af137abaa630157e2e27e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution lure. The embedded URLs, though numerous, do not provide a clear second-stage payload, but the overall structure points to a malicious document.

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 http://ctyrkolky-gamax.cz/data/dokumenty/felifapezidixosubipago.pdf In PDF document text
    • https://bodzlomu.com/userfiles/file/20220682340.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/83863097837.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/hcmkh9db2e4s7tbhj1voai91db/puxetekoweruzada.pdfIn PDF document text
    • https://upbfassadenbau.com/upload/file/duwavuvonaru.pdfIn PDF document text
    • https://ladachess.ru/userfiles/file/fexolokokamajazezuti.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a18ec2c4bd---fedopegivaronep.pdfIn PDF document text
    • https://kawanmto.org/contents/files/85219297392.pdfIn PDF document text
    • http://immobilieninvestors.com/userfiles/file/47186042042.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/simadevokoxuzorix.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/96919266612.pdfIn PDF document text
    • https://forssh.com/userfiles/file/rovarozegazewikurizojox.pdfIn PDF document text
    • https://phm.vn/upload/files/31338137671.pdfIn PDF document text
    • https://kotata-zlin.cz/obr/clanky/file/vesube.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/39105801703.pdfIn PDF document text
    • https://posetili.ru/userfiles/file/24826511848.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/25829965031.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/sumivubox.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/41a43e09c18f840ee67b8f87faf74f7a/25525500306.pdfIn PDF document text
    • https://profitaler.com/UserFiles/file/89873776271.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/35267713109.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/31861082799.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/fepuxewezezoseloxilu.pdfIn PDF document text
    • http://www.predia.cz/userfiles/file/56323572587.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/23467937180.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16138e1e56d903---sowixewasatufa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=suppandi+tinkle+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_off0000d054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD054 10372 bytes
SHA-256: a450dedc020a92203e5f80b9cb921a08ab9183882a1f00196ef8f8506cf2bc6c
font_01_sfnt_off0000e7e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF4 16920 bytes
SHA-256: 0f0439b061c0761cde49f30913c8cf97e8edfa8fa4454bc7164b8f56e7d1f36a

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