Malicious PDF — malware analysis report

Static analysis result for SHA-256 79510f474e891ff6…

MALICIOUS

PDF

94.5 KB Created: 2021-07-05 07:30:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 352a6b6fac8c5844a8c8b58b2e993aa0 SHA-1: efe5d4baf1fd14c403497a463cc8e6615f803607 SHA-256: 79510f474e891ff6347ce068c8c3c5d385d6a5b2952f2ba191543b8026e9e157
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://garglob.ru/uplcv?utm_term=bedtime+stories+for+2+year+old+baby
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/22891184509.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/a90dce0273e35208c6bb1ae805706dec/nopolifexalag.pdf
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/090c3391fc51544356eac9a48a41ce33/milolenifenowagiputi.pdf
    • http://flywings.sk/UserFiles/file/91343255556.pdf
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/dozisuli.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160acc25f7c44c---visigulimifi.pdf
    • http://eraucheta.ru/uploads/file/mobuvivowameveperi.pdf
    • http://dorp.pl/userfiles/files/lutorexukokemazogu.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c1f402b6d---jakotu.pdf
    • http://forglass.sk/userfiles/file/5392238756.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f69deb958---xukizufozipu.pdf
    • http://closehorses.com/userfiles/file/xozewabe.pdf
    • http://findmecakes.com/userfiles/files/72730106803.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16076e07574821---wurexotakixerajusumawafa.pdf
    • http://daiichibus.vn/uploads/news_file/latapusokajepexarivajexez.pdf
    • http://woori-tour.kr/FileData/ckfinder/files/20210607_42EACA2FF6AF042B.pdf
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071904c72857---gotojerebapejoderufurifo.pdf
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/25439ff3b895cd44e81818300ea0b465/77700245675.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7bdb92287---tubigikozijaraguduvoxorar.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1d2b538b6---11887369865.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/466a378d8a18a1ad62937ecdcdfcf250/552224619.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160960db191d7f---gafige.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160d1cd8fdaf31---lepawubevumamuvilajisok.pdf
    • http://vetranhtuong.info/luutru/files/bavez.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f006e38b6d---bexowuwasokusokokuban.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8c0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C0 16792 bytes
font_01_sfnt_off000110d2.bin
811c6e75616cb5af03c5ffeb4e634210d8e8acdd4ceaf6380ed9f32c7f01a377
pdf-font-stream PDF embedded font (sfnt) at offset 0x110D2 17044 bytes
font_02_sfnt_off00013cf1.bin
7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x13CF1 16312 bytes
font_03_sfnt_off000152fd.bin
d2d85e0b8f80113bb009c31de5215654753e887bb9307a18c13b5afb3e033b69
pdf-font-stream PDF embedded font (sfnt) at offset 0x152FD 10836 bytes