Malicious PDF — malware analysis report

Static analysis result for SHA-256 d851dec57dd0b421…

MALICIOUS

PDF

82.0 KB Created: 2021-09-03 22:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ed9f70eec89fd588327f4089fa3b0e65 SHA-1: f62ac62e168b93b01d7cc9daadfa0eaf5b05f964 SHA-256: d851dec57dd0b4215f88e3906947914a555cf82c10fbca8b66b782e5d5492f7b
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and other domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic firings clearly indicate a link-farming attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://pistant.ru/uplcv?utm_term=laminar+air+flow+principle+and+working+pdf PDF link annotation
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/1b69fc76aad53f624aeb321f15dbc0f2/darajugina.pdfIn PDF document text
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/rcmtql6jb0h60vlj01o59ruri1/67924128720.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c563d450eaa---bomimazu.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af088afa5e---xalosatulejejosirukokogo.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/83048599274.pdfIn PDF document text
    • http://geose.ru/userfiles/file/ziledava.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609e53e594800---26196784434.pdfIn PDF document text
    • http://dostrojar.sk/UserFiles/file/27872156899.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/garimupoxek.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a05e15adcb8---fataxotajefexodoxen.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/62975467306.pdfIn PDF document text
    • https://rcot.org/userfiles/file/67217068956.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ce28232ed60---36966925776.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/vaxegunajasopozudipizi.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/17735464237.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/nabukakudedonizovo.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/lozuwawasesinidujorer.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/visidokevemiwo.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/bcfa0115aba3a50944cc3fe34e7cb7e3/67782173594.pdfIn PDF document text
    • https://mauspro.net/upload/files/zitugowanifelitetobukupe.pdfIn PDF document text
    • http://ladakhtripmaker.com/userfiles/files/77953616380.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/83413398243.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/bepilegoderovizote.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2A 10832 bytes
SHA-256: a26a49be85e9ccf97db6b8042324397282d296fb1cd4ba05f1b1e21d8f542f53
font_01_sfnt_off0000f5e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010dfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFB 17436 bytes
SHA-256: 61f63adef8d2fc5c586a169a23d8c5e6395a4b938d858cc4b2c3dd9cdda9e00b

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