Malicious PDF — malware analysis report

Static analysis result for SHA-256 33ab091b85bc4139…

MALICIOUS

PDF

88.1 KB Created: 2021-07-18 12:32:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 278c77479edc9929f7b080d30363cd8e SHA-1: 3c2a86bb5b1372e6aa5b7feb50fe4e88327a9f6d SHA-256: 33ab091b85bc4139979be8f648032697cdf7ee757b29f4bde8b45213d232668a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with many URLs pointing to compromised CMS upload directories or disposable hosting, suggesting a phishing or malware distribution scheme. The document body is unreadable, but the presence of numerous external links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly support the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://www.deep2001.com/images/library/File/37192169307.pdf In PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f4a98f5f0---13887494406.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/80057816732.pdfIn PDF document text
    • http://szalkasszorutacskok.hu/app/webroot/files/content/files/gizadulefaropu.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddbe8656de7---66965058867.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/19598845843.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/tesamugul.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/d75195764e1dfe4bf1da37c9c0825c65/68068551783.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/9421385104.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/fokajinotalu.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/2hf8ievsak2119ngpmovrarg40/xoxokob.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/7e6eb55ff584fd1facf23d5bcc2c4322/91711485204.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/ca8ff82504ca45fb000c4a53d043809e/juzuvidisujadunazobob.pdfIn PDF document text
    • http://emmanuelmissionarybaptist.com/clients/74938/File/jekiwomujubugotafoseguzad.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/56169935006.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/fopiluzif.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/1f589cd1211b773ab331aaf105872800/lonaxitovadisak.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/fixunilonubuzej.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/r5tsri9li6vkvknm2u3gqbh36s/pasetexonokenosidebapo.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/rivukezezoridus.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/nitenemivedujizuregawok.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/74126604771.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/96327fcf32a450bdca06f2f175f50782/21790767794.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0581bc2377---lijikuf.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/607c1ccb311190936a831ece475ebf47/potoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=day+to+atl+flightsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE023 16076 bytes
SHA-256: 0491ab1f9781984131449868ed95f15036bddabad70a51597ae233fa8bdf08d0
font_01_sfnt_off0000f54a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5C 17588 bytes
SHA-256: d2751ef226c4fbb8e2a90672eb6547a089875c9f33894a77d73df1c1db64f3e0
font_03_sfnt_off00013ba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BA5 10272 bytes
SHA-256: 2db6bcdaa20ecf0ada229e41bbf0358acfafc66fef780b9299bac1f7bd5b221c

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