Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a5e36228734b929…

MALICIOUS

PDF

88.2 KB Created: 2021-07-03 00:22:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5b3992dff5babd14f073d756dab631ec SHA-1: e2d98446e03eb8b248aa14dcb36659390c3a9baa SHA-256: 2a5e36228734b9291d4e79ad3ef559f05dca6fcebd818a01f44a9f6b0fce73ad
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to compromised WordPress sites, suggesting it functions as a link farm to distribute phishing lures or further malware. The presence of external URIs and link farms on disposable hosting supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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://simonide.org/userfiles/file/84530671053.pdf
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/b424959ad44ac8fa9f9d04ba980b5457/63177412383.pdf
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/491c5283c3bafe8e2b9fae6190ac0f1e/1509145781.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/bc6235c5f5f95816bdecb57ba076c89b/tosilexe.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/7j8v6kv90tdkgmcvkvi613bccr/xoleg.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b96ef355a---fusakizawajaxiv.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160882d1261d4d---11388780351.pdf
    • http://5m-tti.com/uploads/image/files/2081791760.pdf
    • http://merrygoldholidays.com/ckfinder/userfiles/files/gudojoxuteruj.pdf
    • https://krassimirtaskov.com/userfiles/files/sixuvenanuvexafotepafi.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/cf516d561fe6745c93e0f2f5c091a926/43157820363.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/6384a9e034b4a39113c86c01fb4ff42d/87285089067.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/mkht7ips17ckogntflv3u4q6u4/rewejipiwamidivabo.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe571a408b---zikosajili.pdf
    • http://freeski.hu/freeski/file/zaxufubavumosotoxisad.pdf
    • https://andana.us/files/files/31750201545.pdf
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/tqo4nfjts30m2257loriqds4p3/20051960658.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f6ba72a40---95440649209.pdf
    • http://aedelsur.com/contenido/files/69404859459.pdf
    • http://zulassungsservice4you.de/bilder/file/durawolar.pdf
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/6325570b49e8ae17e13aecb5322f9eee/83576245132.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba8912566b---letuwoxuwiki.pdf
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e10d10b68---91280906409.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b172130e05---78803275742.pdf
    • http://massimosusto.eu/userfiles/files/26428308642.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=getting+lucky+number+seven+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_off0000f508.bin
aef2e144001691f8ea197f8e15cdfd3f7059371d2c14a56a4344e501fa5653ac
pdf-font-stream PDF embedded font (sfnt) at offset 0xF508 17228 bytes
font_01_sfnt_off0001217b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1217B 16792 bytes
font_02_sfnt_off00013992.bin
1fccfa0ae77b8a02d7bd2b5eca819e999ac6c773931dbcab3595ccbdc39c632e
pdf-font-stream PDF embedded font (sfnt) at offset 0x13992 11232 bytes