Malicious PDF — malware analysis report

Static analysis result for SHA-256 46d2ae195eaf97b3…

MALICIOUS

PDF

84.1 KB Created: 2021-07-23 23:54:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a336c93081ffa3331c3ff9baebe66a3f SHA-1: b54736290555f182e09ca703851d3e002d3e79bb SHA-256: 46d2ae195eaf97b310b1121132915678f2b7cc40a72eec8b4ce27692b4eae57d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of external URIs and link farm heuristics points towards an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ec5952ff1---xugurumevawilapevobe.pdf
    • https://cochleartudaskozpont.hu/files/zixudokemivaziwilatole.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ea1edd9b5---nosamusutakakokik.pdf
    • http://iltorg.ru/upload/file/kumanubusolilukav.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160935044ec211---33344636913.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/6b270ac03c055b56b6d2e8e6e92a3aff/kametif.pdf
    • http://dytac.hk/userfiles/bowetoduwegutulowelurofe.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/9dc8260b8ff9a6c76cfd624604c151f4/gidakesutakaduwitamaso.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607eea63e62d1---lisobonuzesigopobufunexol.pdf
    • http://strategie-online.net/catalogue_dynamique/file/2166972473.pdf
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee9d73f995---4080706402.pdf
    • http://asea-admin.com/_userfiles/file/20210503231643.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b47d40b0196---74257657789.pdf
    • https://addsfly.com/userfiles/file/jofofutoba.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b00e5d292c9---59780124694.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dce7c8308d1---21001885722.pdf
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/s5td2rs54n0ekpu3t51kcitull/mugirotigagekafabap.pdf
    • http://novussiteyonetimi.com/uploads/file/tutarerin.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609daf2c8de34---96432642834.pdf
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/6cb14a3ccd30cbc63721e0024533c8b9/20443487571.pdf
    • http://cichanski.com/Upload/file/49997769747.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5aa09dadbd---46124794080.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+get+free+diamonds+on+cooking+fever+2020
    • 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_off0000e337.bin
e2dc0cab095a4bbcb96b0a667e67df3f8ec2a6d6ab462f8443880e1259b60573
pdf-font-stream PDF embedded font (sfnt) at offset 0xE337 17280 bytes
font_01_sfnt_off00011082.bin
5a3853f6e056cfca8fe1f0d9cbfe1a1d84a6615bb1a93013bbf5bb10df03e8a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x11082 11248 bytes
font_02_sfnt_off00012acd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12ACD 16792 bytes