Malicious PDF — malware analysis report

Static analysis result for SHA-256 b87753a4859f075c…

MALICIOUS

PDF

88.4 KB Created: 2021-07-16 03:43:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f01bdfc4c306a4ef76b3a9e6388db0ac SHA-1: 65a6bcf9090df8c9676a0664fffb5e32a0f8053b SHA-256: b87753a4859f075c51162bd92ac501ee25c339bf67c58f412810966fed84ee57
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malicious link distribution scheme. The document contains numerous links, many pointing to compromised WordPress sites, suggesting an attempt to leverage these for distributing further malicious content or for SEO spam. No scripts were extracted, and the document body was unreadable, but the presence of link farms and compromised CMS uploads strongly suggests a malicious intent.

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://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/3f8658b9ff4399881651d9a420d7e6e2/nusajumepavinixutazi.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e42f879b71---90331279332.pdf
    • http://wtmongolia.com/materials/file/papofekulobebagewemugot.pdf
    • http://bitite.lv/media/txt/122/file/solidugibimodefonuvekinum.pdf
    • https://atcotourismtravel.com/userfiles/file/91491304268.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/cd7000ad2af31309f2323367efc12953/16812027899.pdf
    • https://medicentrumnz.eu/medicentrum/files/file/34293853937.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887d3b44db4---25994159416.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab57ed6b6ac---93202781360.pdf
    • http://secohthailand.com/file_media/file_image/file/mafow.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d6b122eab---noroxizikug.pdf
    • http://anandtouristcorporation.com/uploads/90620757484.pdf
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/h57nt0tp4rm4lmqjrool58c3m0/48103723898.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/jljn451v3aqpatmp6lmoe5d4k6/71788230006.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be4524ec7b2---zujesuwa.pdf
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/3426029ca424ae6118c8dd7f38856f72/51208719736.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/e6on92b5ece6aii8u0ckqi9f02/40417130032.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cae905479a---sirovofepukosubokijobizok.pdf
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/54105b4bd6ed37d57c58055ae0a4bc9e/wufasi.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a014c5d5a---86074312729.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/12c7c9c7463ef5dfb4d1dcc4ac3e430d/47929423569.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0a6428f6b7---90707728857.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=george+clooney+hairline
    • 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_off0000f26e.bin
7d286eb972b5f36d96c1c36d9b5b5913f8f09f201353dd23a8e98629acb12209		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF26E 10396 bytes
font_01_sfnt_off000109dc.bin
1fc820937bc0e27d400bf7b15011de7532187772b8ec59889855f41f23b44397		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109DC 18668 bytes
font_02_sfnt_off00013af7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13AF7 16792 bytes

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