Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa0b37be4f032a9c…

MALICIOUS

PDF

121.0 KB Created: 2021-06-30 17:23:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 750d260cc39c1feda62e3bc5870d8cf9 SHA-1: 1d7ce050b8ec2064083ec5f4d28ae39b4e27479f SHA-256: fa0b37be4f032a9c21e23c6c19a83a68fc8aed08e063a55a0431a7d208e451a6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to host malicious files. The presence of multiple unknown URLs hosted on various domains indicates a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d2187afce---78990653865.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/43e72d0ccfb2ab32a31dcb186b54caaf/75033782618.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/0b2c80698084a03971558404345a49b8/bosefofavuvaxisozozip.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/cabefe36840a6e40a566944923179729/kimaxukadadakibadisiwutow.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/02d8b60105800803dd5527771caf8e78/dasamenanekumefibonol.pdf
    • http://ciskmv.com/css/file/32862699111.pdf
    • http://wsp.pl/userfiles/file/sivasonivemotejoxa.pdf
    • http://vervesimuhub.com/userfiles/file/numimuzumafodaf.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/ehjvvn91ucrjic337e5fdv2gjr/gifonepesokoxopoxekuvax.pdf
    • http://hattingtoemrerogsnedker.dk/userfiles/file/bekebaziwavojoganeliwezu.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/0fa51d0e7aa7b30d66c9018d850164dd/10973174538.pdf
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/17486316459.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b31ee31a7---41196340111.pdf
    • https://angkortaxiservice.com/userfiles/file/xusomitexisem.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/m01cjhmte83lf83139omkp897v/30819594178.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/1b2aab4697dcb85125c6c5ea2ce221ba/97965899502.pdf
    • http://foodchemsino.com/d/files/kolibuvedawiluwifamuvexes.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fea33d8db0---pokebafalili.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/m6uddc3lhnnhcnb2vegaifr2ui/gerevutiwizodevowalox.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdb7584835---71895431590.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/denmq4rkivfncg65dh2fei7naf/99538551499.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ceb5b910b9---26839431875.pdf
    • https://asiarsolutions.com/userfiles/file/derafemalagena.pdf
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/0a820f8920d2b829bd6fedc00eab1cd1/zodekowexa.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a0bcc98af---95270862162.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=personal+statement+for+fellowship+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_off000177f5.bin
6e850deff6c5433d63713ceeeb325e299ff4a1791af01795acb824644816ff04
pdf-font-stream PDF embedded font (sfnt) at offset 0x177F5 17188 bytes
font_01_sfnt_off0001a4e6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A4E6 16792 bytes
font_02_sfnt_off0001bcfd.bin
9bbcf9177ca2183ffa99054c3a6978c4fe6bea0a1c7502f5459f0455450171bd
pdf-font-stream PDF embedded font (sfnt) at offset 0x1BCFD 10852 bytes