Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f1e0660ec35251f…

MALICIOUS

PDF

80.6 KB Created: 2021-08-21 11:36:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2835efd680caf39e2c98f8afb491f422 SHA-1: 700f62690442269feb5b997b4ce32d34660fe648 SHA-256: 1f1e0660ec35251fb006edd48ca957bb6f4f73beff3787297352ae68b8ab415c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF functions as a link farm, directing users to multiple domains, some of which are hosted on compromised or disposable infrastructure. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 http://partnerplus30.ru/images/fornews/files/95806243398.pdf In PDF document text
    • http://aarogyamedico.com/userfiles/file/35709012640.pdfIn PDF document text
    • http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/xuduxibekewunod.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/wunatitinaxipoz.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/4g5t0m0sl2sjdfrq8u23ialjv7/jopur.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/79899085947.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/sutajukafibuzu.pdfIn PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/55241237772.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/nilesi.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/1c4f0628e0a0794d0a8b5ab7b7041768/vivutinijikabuxumode.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/kuboboxafatibutikinoxetud.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f5e55bd2d72---31423562608.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/somokapepafed.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160d5ea1265728---puverowujojozadenuzadatak.pdfIn PDF document text
    • http://tingyi-bnb.com/CKEdit/upload/files/5285604999.pdfIn PDF document text
    • http://portalkucharski.pl/app/webroot/media/files/66713716827.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/gilibameranokinifagabi.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/54f2feef01b67486219170a78a23f0d0/jumiriz.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607464ec25392---59444579772.pdfIn PDF document text
    • http://alaskacounseling.org/clients/8/87/870ae3779d21e956d596131c1dd113ff/File/binutopakuv.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/v6o3hcc59e78pj1rivh49nrjv1/19198231005.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ffe8e0d32---gegenivukabifatatulaverog.pdfIn PDF document text
    • https://jss-moms.si/upload/File/61616567403.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/cf5dc81436cf8ee9a19882f00b2b5bfe/jukomun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=manualidades+de+fieltro+de+navidad+con+patronesPDF 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_off0000d6a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A7 17580 bytes
SHA-256: 267cbd918875a41f0804613fba20f0bf79feafbe4badb9e537b69ea16ad6001e
font_01_sfnt_off00010230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10230 10772 bytes
SHA-256: 6e2ddf572afb956d2929bcc697610d8cb0959c89ee1b761578b1bdf11f76900b
font_02_sfnt_off00011b1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1