Malicious PDF — malware analysis report

Static analysis result for SHA-256 941a8e6fba46cb03…

MALICIOUS

PDF

87.9 KB Created: 2021-09-10 03:29:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-12
MD5: b44cbb55a37c50fe32bc1a2a6b948496 SHA-1: b9295064b294d00e2a1db51231453d01241b0971 SHA-256: 941a8e6fba46cb0303719503891f68f6d4d65a0c73f0adbf2754f57376d637ae
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users to malicious sites. The presence of a link farm pointing to multiple distinct hosts, many of which appear to be compromised CMS upload directories, further supports a phishing or malware distribution vector. The embedded URLs suggest an attempt to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365e1f6d664---97341156083.pdf In PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/lowiwit.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/96554631425.pdfIn PDF document text
    • http://dreesmann-foto.de/userfiles/file/zagus.pdfIn PDF document text
    • http://grandfiltr.com/files/file/11775648630.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/64145598079.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/50242998770.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16130124e7b5ee---zivuwezenesator.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/78834355468.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/31846428472.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a04b0e6830---xozigaromi.pdfIn PDF document text
    • http://xageunion.com/userfiles/file/41578101729.pdfIn PDF document text
    • https://drjou-vc.com/upload/files/kururupopi.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/67177928125.pdfIn PDF document text
    • http://photou.cc/ckfinder/userfiles/files/39692759513.pdfIn PDF document text
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/javeg.pdfIn PDF document text
    • http://vanhacollection.com/images/files/56420305953.pdfIn PDF document text
    • https://v-rshine.com/upload/images/files/puvuwosow.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/jonipuxalefa.pdfIn PDF document text
    • https://maintogelonline2.org/contents/files/kefojasukugigekegedepusir.pdfIn PDF document text
    • https://auto826.vnpec.xyz/uploads/files/jerexaxefidilira.pdfIn PDF document text
    • http://canvangdientu.com/images/file/fojejasukuxivawanulesigir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+watch+spectre+for+freePDF 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_off0000f1db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F2 10412 bytes
SHA-256: 83423ed484ae339841ddf47a879bb0e129ff6a890309a7bdd8a2beee662162aa
font_02_sfnt_off000121be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121BE 18668 bytes
SHA-256: 7de74db9804ba5cf2cc8e30051fff4d9d952a9a421d457339a55e7e6941cb129

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