Malicious PDF — malware analysis report

Static analysis result for SHA-256 45bf77ac5e23a2a3…

MALICIOUS

PDF

84.1 KB Created: 2021-09-01 01:45:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 43ea8d1f7b34e9ec843299ab88846531 SHA-1: 2ceadcabe833d00d5317e0fabd3d2a18be628bc3 SHA-256: 45bf77ac5e23a2a3974412bd52e0002f19193e9e82623fef384fae01bc2ee658
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate these are link farms, suggesting the document's purpose is to redirect users to malicious or phishing sites. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/dbf5a32d2bb985b031131eeba83c36ae/gozikapekijarevenaw.pdf In PDF document text
    • http://schokofontaenen.de/idata/69121963433.pdfIn PDF document text
    • http://xn--q20b13r9leepaeb.net/upload/file/202108280033507268.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160b4025d7e34a---vobaripegax.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/1007c1eed8f8bdd7355c2c199affdf9f/50181723562.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/zebufepowavoxilulali.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/zugonugo.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/49685581617.pdfIn PDF document text
    • http://riversedgefm.com/files/file/322050885.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/64977851457.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/e894cgm1t99sn8b4t890kab1r5/nefazibenibefefej.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/zerufofifatipowew.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/satt2j9jpmeshbqi11hlv061r0/97382605613.pdfIn PDF document text
    • http://diacritic.org/travel/app/webroot/img/files/takasenapobifupezujo.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/80093825941.pdfIn PDF document text
    • http://espwireless.net/uploads/file/koputege.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608432cc8dad4---52271155055.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/73911844082.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160fb5608d8973---godovimu.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210522120023.pdfIn PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/gegadajixija.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/fivejixawivod.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/h8tr2rhe40t0vlolsphv528hqm/31748292609.pdfIn PDF document text
    • http://project-st.ru/userfiles/file/45292711657.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/noguforinokesuzerin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=hit+and+run+gamePDF 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_off0000e2a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A3 19656 bytes
SHA-256: 5f665271da2a91d88a1b02fd13e87844626ab945afdc37de2a705a4b02ce73ac
font_01_sfnt_off00011442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11442 10348 bytes
SHA-256: 9bd037e643dfea5b452c45c101d376ad10030ea22f6a66a766f749044155e63e
font_02_sfnt_off00012b4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1