Malicious PDF — malware analysis report

Static analysis result for SHA-256 3494592e862b2b8f…

MALICIOUS

PDF

71.6 KB Created: 2021-09-22 22:18:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 726647576c307aec12373a8d327ae468 SHA-1: e87b5687d1608f34d1a5180810b227cb007be004 SHA-256: 3494592e862b2b8f8371ed539bc8d8e50325841b3fbed21ad964db455bac14d3
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal Application Data

This PDF file contains embedded JavaScript and is flagged by multiple heuristics as malicious, including a specific detection for MFA/one-time-code harvesting lures. The embedded JavaScript likely facilitates the phishing attempt by interacting with the user or redirecting them to malicious sites. The presence of numerous links to disposable hosting and compromised CMS upload storage further supports the phishing and credential harvesting intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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 https://impeka.lt/components/com_mijoshop/opencart/image/data/files/xerimavagiwobirafasor.pdf In PDF document text
    • http://autofactory-jin.com/js/upload/files/kozun.pdfIn PDF document text
    • https://tonmathunglan.vn/upload/files/84265010075.pdfIn PDF document text
    • http://tokyo-sanritsu.com/userfiles/file/78062765578.pdfIn PDF document text
    • https://harmony.im/userfiles/file/2207569109.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/18915667503.pdfIn PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/kesofalosemexomukixa.pdfIn PDF document text
    • http://rafaelokazakov.com/file/43072085715.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/e3835b6e3a523b3cf9ebd796d78e05f4/kuwovibevamiwowubotuge.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1614b5391d21bd---50009592086.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/20082420905.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/c25c9c77290d7b29f4a01b9c20e3c71f/92632303330.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/jigamubokegebew.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/15730814016.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210919_7D0AC5F60EEE9092.pdfIn PDF document text
    • https://vargyasnekonyveles.hu/kepek/other/file/rutanidufaderumuxavemax.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/tl5hrif622b5jvdlul3giuet5q/36400829853.pdfIn PDF document text
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/5850843131.pdfIn PDF document text
    • http://merklink.nl/site/data/ws/files/79430967560.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/zexuwisobop.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/veragafejesubir.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/57953791318.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/medizugogemo.pdfIn PDF document text
    • https://ms1oke.com/contents/files/rijufewogezosefu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=track+ems+speed+post+status+online+indiaPDF 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_off0000b753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB753 15536 bytes
SHA-256: 1b26c63c18ba78a647df50bde0cc3802a11b44c93141d179bfe925bb0e4cd0ad
font_01_sfnt_off0000defc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF713 10832 bytes
SHA-256: 944aefb2cc22d90faefe647ef428f10ecfe7707532bf52cdafcc02b9b19b261e

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