Malicious PDF — malware analysis report

Static analysis result for SHA-256 e43b56963b73a4bb…

MALICIOUS

PDF

146.6 KB Created: 2021-06-27 15:44:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b5ce6b3dcb0dd774a66ee095736c1c74 SHA-1: ad41d32b558ca84e46300c5c5b20a3c3d3a9f786 SHA-256: e43b56963b73a4bb71e20818cc8e09c47df7068f6e19084bb4e8fe1430b08cc9
256 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is classified as malicious, with critical heuristics indicating it's a lure for recovery secrets or private keys, and also a password-protected archive lure. It contains numerous external URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or credential harvesting attempt. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9920

Heuristics 8

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=pdf+how+to+rotate+and+save
    • http://naturallabs.de/userfiles/file/bitisutujufexosuk.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872fbf6d128---pitakutojiboxi.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6331b29c7a---20751267349.pdf
    • http://osc-pribor.ru/products_pictures/file/dutulegomiribopakowize.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/rqq4kfqmjq7feqqgj952mtkqvv/nexoxezakelubifege.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/l0fl38posnleq8ek2r04k0f6ii/1084967848.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc57c35142---rigovisagesa.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/35d7f15f71bad45d3e3d258caf161875/figefonolujeweba.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/7a2f3f0af32ac79f5064e62c4b9cee49/munezolobezokobadefebon.pdf
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/c50d944ac6bf433eacc632541492e995/rijuxugani.pdf
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/00e06b1d3281fe5eb9261b9de9aa756b/69402236849.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/215dcebscvkmlrf0hpkbi69juj/noxavosasewatofevasiw.pdf
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/tp36r6lbogf6kc2p0rhtb797sf/12859067670.pdf
    • http://highlandhighclassof1962.com/clients/c/c3/c330a44b04b080977bf299ea430a317d/File/gerunesoweguniwe.pdf
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/2faf6d7804a5f3ed9306d6efa4dafba5/11722401896.pdf
    • http://simonide.org/userfiles/file/xemegawokupoku.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a78b37e08e---7542316993.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5d2c8ebd3---20190059883.pdf
    • https://alkirbilaw.com/userfiles/files/xijavobisadi.pdf
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/8f658f9f687a511446f163fd757f8a85/voxujedudojatuvunilomoguz.pdf
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/r5npc3e0mjg1g9iv8om0k3oche/basukupewapezijimudofefu.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16072d5fd225e6---zujevapegosisijukem.pdf
    • http://rymwid-training.com/userfiles/file/lazazosur.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_off0001dfca.bin
33ec4de6fcdcedc79a53c0aa643cd602eb3fb7bb31693ddafd954457873d80c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1DFCA 17236 bytes
font_01_sfnt_off00020d2a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x20D2A 16792 bytes
font_02_sfnt_off00022541.bin
3bc71d33a345ca041d4aa80c438b3b501225e0cd7121b93995ff1f805b46f3cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x22541 10464 bytes

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