Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d08d01d3b91458e…

MALICIOUS

PDF

83.7 KB Created: 2021-06-27 23:05:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 671e5e808e95e5ec0a8c746080f9bc64 SHA-1: 52f0e9bcab7924e510f11470ab4db969e9f8ede3 SHA-256: 3d08d01d3b91458eac8c82ad8459599201be2a02cf2814a2551d8efd54165869
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised CMS upload storage and disposable hosting. The critical 'SE_SECRET_RECOVERY_LURE' finding suggests the document's primary goal is to trick users into divulging sensitive recovery secrets or private keys.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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 http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b957ea817d---kuseliwudofudu.pdf
    • http://ahchala.com/img/file/miduxovulorirezep.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/96f3bf10a60215db3d8049a43d82a6e0/bevudebexeze.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/1b26e8f5ada746cb75fb3591b3c49132/jupigewezebizagomojejife.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/082dc2c3864e57018b90d4b2e9064e1a/kasofamusivazekivakexak.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/ftn9cgh9lbut44p5o7668k0os7/lumisuditiwaxominode.pdf
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/e31e58d4e63621329d892fd107677812/niwebabixatepisowetegi.pdf
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/8ee1102c68eea1c68e83b7f13b38c79c/famumexubuwak.pdf
    • https://onlinendttraining.net/files/kakisebovevoxigeziguzu.pdf
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/eb425adb889f3d1964ec76fbdf68fcde/97559653163.pdf
    • https://audit-advisers.com/userfiles/file/nopaxaxoxejubinuse.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608750e130268---xomepepu.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160830f19c0fad---76281627777.pdf
    • http://maility.pl_adresuserfiles/file/87100115564.pdf
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/8779b609cd85c871283c15ea0120808e/sadubaginopotiwovagoguj.pdf
    • http://tovicetour.com/FileData/ckfinder/files/20210609_E148418113A7FBE6.pdf
    • http://terminsk.by/pics/files/74211307676.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/c19bf718308278a607a588a823eb8925/tukipulijigofus.pdf
    • http://cnc-soustruzeni.cz/files/file/gilubisi.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b13da5d768---dadizonedibodifexod.pdf
    • http://asiavent.com/UserFiles/file///bumumipedikuzodinuke.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/71cda278e70e9a2bd0a754ea9272b035/jajorobusepesasexalopi.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609c794b684bf---61627249004.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=ccnp+certification+guide+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_off0000e67e.bin
b5f2e16b6b5449ac079c98c81a0b10853f02524ef612612b5ad2f632ca898502
pdf-font-stream PDF embedded font (sfnt) at offset 0xE67E 16372 bytes
font_01_sfnt_off000110d9.bin
8474b9b0fc292e46ee20194a5fb0434e66c1d49c74bd0b2558900107cbefa7f5
pdf-font-stream PDF embedded font (sfnt) at offset 0x110D9 10712 bytes
font_02_sfnt_off00012959.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12959 16792 bytes