Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d3d61ad4be72058…

MALICIOUS

PDF

67.5 KB Created: 2021-09-09 00:19:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 23be2afbe35274dec7b66306b382d1f7 SHA-1: 98954eff776787c569ae15c9008d918ee40b3e7d SHA-256: 7d3d61ad4be72058fce81d5c718e9c7e88e4b38b719d55b51813195bd24d93b0
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF is identified as a phishing lure due to its image-only nature and embedded clickable link. It directs users to a compromised WordPress site, which in turn serves additional malicious PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/161350929891d1---97494977559.pdf In PDF document text
    • https://vpmemorial.net/images/file/petet.pdfIn PDF document text
    • http://diencongnghiepvohoang.com/uploads/files/somunabaxajononu.pdfIn PDF document text
    • http://iknow.pl/files/file/gamusikozevosasu.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/68318985458.pdfIn PDF document text
    • https://signatureshreyas.in/userfiles/file/31998576539.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/66547907590.pdfIn PDF document text
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/javoxafopopava.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/41475687981.pdfIn PDF document text
    • https://kalitelivideoizle.com/resimler/files/kiwasunoxijisulufovaxeku.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/fevabesofawidurow.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/161338034dc34b---vefava.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/dozufoxejemalet.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613507bacf3dc---53276398208.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/4253e7135d614dacc6731b7c4992e5f9/judezovinowa.pdfIn PDF document text
    • https://dienhoanghean.com/upload/ck/files/lanobuvawofimekop.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/vaniwodep.pdfIn PDF document text
    • http://dietgame.net/admin/fckeditor/data/file/20210905114329.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613163634e5b1---sututizozanora.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/80714763597.pdfIn PDF document text
    • https://inks.bg/userfiles/file/zakoziwoguvaxosetaxeru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=acid+base+properties+of+amino+acidsPDF 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_off0000ad26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC538 14132 bytes
SHA-256: 5ae21fc12178f41bdfe1f3883405ec4c45d7c4ed8ccd21ebabb0a275e847f2e3
font_02_sfnt_off0000e806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE806 10856 bytes
SHA-256: 1ecffeaddd9a747184d7e953dbf5b22fb9cfffa20b86108940e31a6d8400ba63

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