Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa896a31f9d8ed77…

MALICIOUS

PDF

93.3 KB Created: 2021-07-08 06:45:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e393d96107b3dc502663843c4651c337 SHA-1: b3c99782684c6be7bb70eb476e692ac2d5ca7d73 SHA-256: aa896a31f9d8ed779595b62a7d9905fd5299998f0f5fc22ef985b623aff3dcf9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution campaign. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the use of embedded JavaScript for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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 http://fogathajtohirek.hu/fckfiles/file/bivedubowadifom.pdf
    • http://agcslohian.com/userfiles/file/lexozuralib.pdf
    • http://manixcnc.com/ckupload/files/wexawikajosojirudajoj.pdf
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/72q6kqv6p1mdi8odcsgg9qhs70/47803144878.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4589b36bc---48392073921.pdf
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/kuxor.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085dd4f93224---40189059206.pdf
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/70012714586061e36164b69cae662ea5/fukasizeramovonafiv.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da438bdf47a---11514571717.pdf
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/16097f209d835b---32578293503.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/77fae01d54ee2b7cc26b37c6e89cadbd/51948129205.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/14678a463f87562d18e7cbc620021028/50587915325.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/a6f6f444c1607692ce78db77f14b2d0b/jinodemozufawivuxano.pdf
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/3mv0lh2ac4lasfqt64l431dej7/retuxogotokupupafelodo.pdf
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/9b763667878827f0de3f4ea4cd0aed9c/senemarovis.pdf
    • http://www.ecvbrass.ch/user/web/file/16370183343.pdf
    • http://arci-mp.fr/admin/File/67849530001.pdf
    • https://chiataiec.com/userfiles/Proj_Name//files/xezodaweruvevukiruxuz.pdf
    • http://furniture83.com/upload/files/netagib.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841e3db060c---69573168791.pdf
    • https://motacademy.it/file/bazilaxetodusasovifezez.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/fehfi37orourh3ou39sdu8epb9/gosap.pdf
    • http://herningbadintra.dk/app/webroot/upload/files/28495060789.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=steam+could+not+connect+to+steam+network
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000e81d.bin
11e88ed2f73394ae15644db1597fa1989a8b21b0621216e50283d3c2120f830a
decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE81D 18556 bytes
font_01_sfnt_off000105b4.bin
de082d5e95a069f041f518960a5945adc2557c79d147c701979ba6c0278083b8
pdf-font-stream PDF embedded font (sfnt) at offset 0x105B4 17864 bytes
font_02_sfnt_off00013473.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13473 16792 bytes
font_03_sfnt_off00014c8a.bin
193bbcd957b4ad9d72fbe32b997bddba57cfbcec2ae43ad2d7985a89cdff913b
pdf-font-stream PDF embedded font (sfnt) at offset 0x14C8A 10792 bytes