Malicious PDF — malware analysis report

Static analysis result for SHA-256 b120ab6e1c61216d…

MALICIOUS

PDF

78.9 KB Created: 2021-07-20 18:08:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1897afbb59fac924fac16b9d5c6871f1 SHA-1: f69a4ff3936b6858fac8311493f102f7c3d2d5eb SHA-256: b120ab6e1c61216d8dd7c9ef8f4a4f0aee03d62eb3b0af7b4db05171f109b568
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified as a classic advance-fee fraud lure, likely related to lottery or parcel delivery scams. It contains numerous links to external sites, many of which are hosted on compromised WordPress installations. While no scripts were explicitly extracted, the presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics suggests the document is designed to redirect users to malicious content, potentially for further exploitation or phishing. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc70b7eb17---vugefujugefurusizijedepa.pdf
    • http://driver-jazda.pl/upload/file/zinuginej.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16096755c141aa---kogora.pdf
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0ecc53ef9---99654798436.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cec915176f---tefolarubude.pdf
    • http://doktor-okonski.pl/uploadimg/file/poteka.pdf
    • https://bamfieldrental.com/userfiles/file/bobuxaposoxogizo.pdf
    • http://mikailang.net/userfiles/file/20210620181937_889363715.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/661e70cbc065fbd89ef7daa7a047539d/xuvejuzili.pdf
    • https://alihuata.com/userfiles/file/ridikudetu.pdf
    • http://metalltechnik-kutschi.at/91350475305.pdf
    • http://richardarnoldalumni.com/clients/a/ad/ad1dcfa6f69ac51e3fe6bec18f6cf6d6/File/60109962535.pdf
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/ttmhqafm1ebo96j6s98sfqign7/wujukosigarunujukovag.pdf
    • http://digivideos.net/ckfinder/userfiles/files/vezasarumudu.pdf
    • http://ufnk.fr/app/webroot/files/file/damepowezumavinefimomimi.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1609baa0327c4c---roxagukumofafugajigirowud.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be0ee51c07---59447872163.pdf
    • https://ozsersogutma.com/upload/files/4387620300.pdf
    • https://ridersshop.it/file/55966763898.pdf
    • https://afayl.com/userfiles/file/47078034881.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160f085d0a0f10---4087975466.pdf
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/cff45270ff18f17c0a844102878ce789/tibopo.pdf
    • https://thehero88vip.com/ckfinder/images_store/files/betodov.pdf
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/kebuforixuwemizarizu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=texas+southern+golf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d231.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD231 16792 bytes
font_01_sfnt_off0000ea43.bin
dfcedb7319131cef716d4a47db7767e9bcfb8575195a6509d76ea705fd48b035
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA43 16888 bytes
font_02_sfnt_off00011690.bin
6b3a811a58b107ac960ae3f575f4fb3bb7b02bc9f1d9f9380589185f55d08e91
pdf-font-stream PDF embedded font (sfnt) at offset 0x11690 10568 bytes