Malicious PDF — malware analysis report

Static analysis result for SHA-256 fad72478a3afbbf7…

MALICIOUS

PDF

80.9 KB Created: 2021-09-10 17:50:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a9cb5063f1f4fe7d507b3210407a18ad SHA-1: e10e7832cdb6242e33044780498836111d3411af SHA-256: fad72478a3afbbf703f4a6bb522a2a5c0d55a642786317d0ad174e166987c2ae
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/fe39edbc5561392cf08b52edd9bf1ff2/62544939904.pdf In PDF document text
    • http://trumoi-khutrung.com/upload/files/23933512076.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/13130327765.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/lokilosewapimifomodilino.pdfIn PDF document text
    • https://pianoinprimopianofestival.com/uploads/file/43911295063.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/zitufun.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/zipuwowinezapinifugom.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/16285133657.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/44357960892.pdfIn PDF document text
    • https://granitnet.hu/editor_up/filexuzorakerominuruteber.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/mubobuxubarezewepepelo.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/92417893943.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/jixotumapaxikineduputu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d48197672---xukenenofazizibirev.pdfIn PDF document text
    • https://tomas-music.com/contents/files/tikegopukojidi.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/35842709340.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613546740e630---nozasizegasewebo.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/54560307876.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/xiwaxasavuguxetuxepuw.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/rufuropojavofa.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/vamawafazatobuwafogupigi.pdfIn PDF document text
    • https://schmitz.cz/res/file/99249033008.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16134ade68d2aa---31404239223.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=tractor+trolley+game+download+apkPDF 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_off0000d494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD494 10852 bytes
SHA-256: 0604935ed451e66f8b44795dae49153da0a97ae11ad5e3b1179c5f1aa9489237
font_01_sfnt_off0000ed90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A2 18456 bytes
SHA-256: dd0112974103393c3c3316337bd34e81ba8fc83bf8f175c0e294da4555d27ef3

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