Malicious PDF — malware analysis report

Static analysis result for SHA-256 25f28d4c837741ab…

MALICIOUS

PDF

114.9 KB Created: 2021-06-29 02:58:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 55e0f34a019d361ca6e06f8bfa76272e SHA-1: cd2e6fa989d037e27ab37f746ff5c7ae8ca59402 SHA-256: 25f28d4c837741ab5495cac40bfce0186b0e2f787bbc4b40525987534970e4a1
156 Risk Score

Malware Insights

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

The sample is a PDF identified as malicious by ML classifiers and ClamAV, specifically flagged as phishing/trojan. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely intended to lure users into downloading further malicious payloads or visiting phishing pages. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856eb73f0d2---jovuvan.pdf
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/435bacb3e7923e7713c011e2148bad5e/ribazatavinejizejuxonur.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1f7cc42a0---mulikizixeparu.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/999dda9cdfa0d69abdaf8a64bbda7119/97761281303.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160acacf67801f---pelititejovuxijidewekuje.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c9180553a---30758032422.pdf
    • https://bawwabatrizq.com/userfiles/file/lijoril.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/16393b3d95b8cadeb93876259907b17f/79705736531.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866f8962a74---67809056788.pdf
    • http://schodylux.pl/userfiles/file/jokakonamofafusigagubobo.pdf
    • https://majorsagilekvaros.hu/uploads/file/tiwafanelilirago.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6d081e49d---92807405887.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd80441ce77---41591881870.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/e39140370e17998533d6231103ed90ef/46302169112.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2b2fd062e---38007098675.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/2f2be6574d829a34fd99b288d2a3bd3a/gakurezaz.pdf
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/b8726ff97f0e2b5654bcd58a9657c362/guluputujaza.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/87fb88f22ef86386f70fef04fe10b233/fufomilagelupa.pdf
    • https://e-uchebnici.com/img/file/83203224511.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/65ff6f52471568c4ffa6809b4da47469/nuwerezowavexusopik.pdf
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160751acd9f7ea---59731404014.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=chemical+principles+of+environmental+pollution+pdf
    • 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_off00015aed.bin
a18ad7de4d4e27b3659e0a0bdd64b600a12650d6f1cae9555e0d64d1cfbc3fab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15AED 18892 bytes
font_01_sfnt_off00018c97.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18C97 16792 bytes
font_02_sfnt_off0001a4ae.bin
2fe3a31c7feb5637c1d172d90a13e18b1fe792ffd129e5c1d8d8da5935e770cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A4AE 11084 bytes

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