Malicious PDF — malware analysis report

Static analysis result for SHA-256 194e1f65df797b35…

MALICIOUS

PDF

87.8 KB Created: 2021-07-18 23:57:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5f1f7d18d4fdd924be2cf985361b1f85 SHA-1: 0db2702050af52c49d2e9fd7116dff4147f041d8 SHA-256: 194e1f65df797b3583e422345eb4736c688b574258ad29e3b39aa3d57209308a
212 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple links to external resources, many of which point to compromised WordPress sites. The 'SE_INVOICE_LURE' heuristic suggests a phishing pretext. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to download and execute a secondary payload or redirect the user to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 9

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://s-privod.ru/userfiles/file/51307960773.pdf In PDF document text
    • http://sevvalturizm.com/rsm/files/6542109841.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098f0ddf15ce---7716395261.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/74123204185.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/kugore.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/9da26ad082ff3cb7b43617a90b4b5a58/16361459716.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/xekikedasopak.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/logufo.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/5074af5e625f22c97be99f84cf744d98/34311883307.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/30107256256.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/74898336902.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f3c6b58bc---bozagobono.pdfIn PDF document text
    • http://sb-78.ru/files/file/bepig.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/xevaxedobubi.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e3cb78814---ruzamonupegugidofirajav.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c052a08a61---50403169912.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d44b6dc1c---67778531088.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/mo8a5ejkm79m0j6777vr9e65d1/93060182416.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/gekibixonumu.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/kugakegi.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/tenigokaxonelunemazes.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/wejomijefivunafafa.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/96606850012.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=he+works+in+a+bank+reported+speechPDF 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_off0000f453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF453 10876 bytes
SHA-256: ac98f46c58541fc19d97e14f4bb9c2e42372fab9c8f628e8f6ec16a994d57dec
font_01_sfnt_off00010d39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001254b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1254B 17036 bytes
SHA-256: 13ad814a715235647359d83a0ee6a1890840ea9f9bf7a759da4054918245abf3

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