Malicious PDF — malware analysis report

Static analysis result for SHA-256 e74576b6caadf5e3…

MALICIOUS

PDF

83.6 KB Created: 2021-06-27 13:16:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b4549f764e9d21264b3dd07f1698c910 SHA-1: da28410d383cb8a7c8c7596e1eb5c174c58fad7c SHA-256: e74576b6caadf5e3539db7309e9cb9a985102f640e2856f249ee892e3aff1350
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, likely intended to lure users to malicious content. The presence of multiple external URIs and link farm characteristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://coretry.ru/uplcv?utm_term=how+do+you+calculate+relative+atomic+mass
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dadcb1926a---86936805421.pdf
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/56d1b90ac24e13bd5cc49c0a2ef396f8/reteperuvenexa.pdf
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/8f97728b24f52e939e4326d8a95885cd/90028715009.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a66d3c252cd---xosisiseworotonokumeruvam.pdf
    • http://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/sazipitum.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbbc736a8d---nifefuf.pdf
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/2bbdb71ad12b397cb2e2c077fdf7a717/9824529427.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c95b5eb4c2---16026153507.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e0f83b9ca---nejurokuzelawib.pdf
    • http://allnatureint.com/userfiles/file/32072213167.pdf
    • http://cosmic-kino.ru/sadm_files/52734789178.pdf
    • http://nktrading.qa/file/files/zenofelidamitewo.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7aae38d75---70766290909.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607d091618b25---ruvunezatofomirakimifa.pdf
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/18308c1421d3b70a99e72066b177e6c0/87321619119.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eacf472da1---81317470643.pdf
    • http://ricarda-allegra.de/userfiles/file/23236185449.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d6627941a---61882243530.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b21dbded6d4---79286683128.pdf
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/soxugofanazubasini.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b97e2a9fc7---51179135246.pdf
    • https://sharadsangam.org/UserFilesTwo/file/xogam.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2e3f45d22cb5b39e3f74f8f603af2479/dotetatifitanajibated.pdf
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/mumavinifivolefeza.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_off0000e4fb.bin
ce5e3e21afeef57ee9e091e8503e080f63492b71c5d4b3142f618b5823e40504		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FB 16592 bytes
font_01_sfnt_off0001101f.bin
144f6fc4f042015c69a5ac94905350f4962b8f37393995f15285dfc94b2f6830		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1101F 10784 bytes
font_02_sfnt_off0001290e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1290E 16792 bytes

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