Malicious PDF — malware analysis report

Static analysis result for SHA-256 93efcb80ac213de3…

MALICIOUS

PDF

86.8 KB Created: 2021-07-02 11:10:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1a3033e38332c83efe53ef4180d44699 SHA-1: f2837d1c701b57b1731a0b00813e7ad25c6a3687 SHA-256: 93efcb80ac213de3695592b30587ef30cc4905a0c0ff99996858dea7de95652a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with numerous URLs, many pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the presence of multiple links to potentially malicious sites is the primary indicator of attack.

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 https://advantagelic.com/singhania/downloads/file/najesowepadimisaseroworoz.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/5fc31abe40cfe2803f42e2e48ea4f01f/9880577782.pdf
    • http://starinviter.com/ckimagefiles/lizutodadinopa.pdf
    • https://equantumconsulting.com/files/files/76383875273.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160975689ed671---zibasoxibogepifaja.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cba6652dc1---pipijenusemovopafe.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/b890849c6951342071ba739370b2fb50/modoxavipona.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c317c216f1---bozevegukukatesoviga.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/knem2lvl4o203ulqv99qh1vove/536987956.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/pco3e7dgn4e4eb3ph33dn97jq7/28340661341.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/e1796d99caeccbf3c1d7ae60ad424de1/72748945923.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/ea4dbc4603c4c7e3a7185de451934340/69648239145.pdf
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/488922f8b435b8be117772aadc3494c8/wuziwet.pdf
    • http://casaatlantida.com/userfiles/file///98295388884.pdf
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/dc7e738ca5fbf0b7680f1a3eeaf3425c/48602389087.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/qgg6obvtusn4tiesgj0ocs79o7/wamizidumoti.pdf
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/00c7vucvthlrrlaa7qiufga9gq/28170728724.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796c2ba940a---79419131395.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2cc27574a---fakovatilegadidelugome.pdf
    • http://asianmosaicnyc.com/userfiles/file/gekibogutazukux.pdf
    • https://castilloexterior.es/ckfinder/userfiles/files/91913076970.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/77007311ff944e1eaad1f914f41e38de/lovet.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=irritable+bowel+syndrome+anxiety
    • 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_off0000f1d4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D4 16792 bytes
font_01_sfnt_off000109e6.bin
61cc2e7c2e37b4d75a587de0d48bae17331431806ae679366186cd908b5f0bd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109E6 16732 bytes
font_02_sfnt_off00013515.bin
95a6d8787ec924ae3de3bbc8d3cc89a6cb44b3472cdedb63d6a489c4a2deed1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13515 10804 bytes

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