Malicious PDF — malware analysis report

Static analysis result for SHA-256 59a518407240a7b0…

MALICIOUS

PDF

76.5 KB Created: 2021-09-08 04:51:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: e19d0c225a5dfc71b36e44c829fae937 SHA-1: 85c7a4a9f196d64e8c2695e006857c8271ef354f SHA-256: 59a518407240a7b0bb60b16382837dc82b4ede367f33d217ee8a9dda788baeac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains a large number of embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to lure users into visiting potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://smidgel.ru/uplcv?utm_term=tradable+pollution+permits+pdf PDF link annotation
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/5d191d340a1ef797738a004217d0b2fd/vajukesevoralopaje.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160907e45114e3---pabapurixe.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/ff4a3034d3c38e3cf5728c187839e472/kalopinu.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/57f08065a99addcbe59921ac8238005b/viremexonunob.pdfIn PDF document text
    • http://ohstigers66.com/clients/d/da/da15611725e7ba20b6827cbf2e24f87d/File/pimutiwawozuxamawokutumus.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/168ccd6901afcc4634c08ab9b96e2883/zipazivojena.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607173b4545d0---gozuxivomevap.pdfIn PDF document text
    • http://brlairport.com/images/file/14173698823.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/tugemode.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/43301860847.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/35102312921.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609513418090c---jekapof.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160cc25d712fac---67122702912.pdfIn PDF document text
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/71fae424e01e06990c7e02f881d13473/jazozu.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/jug1s2u8np7n0pooskcuokoj71/43633769092.pdfIn PDF document text
    • http://guchenes.com/d/files/10071074024.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/75807056596.pdfIn PDF document text
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210811_8D06DDAE25398A8E.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/97d6237718ba9f269e11571bb53e30df/35699181652.pdfIn PDF document text
    • http://cjatkinson.com/userimages/85734530364.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/162264755833.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/nomefutebatusosevadekexum.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/69739842736.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC715 17276 bytes
SHA-256: f36331db4a02a680507cbde8a77b892e7fd4811ea4dbbf3b2721141450e13d1b
font_01_sfnt_off0000f35a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35A 10864 bytes
SHA-256: 3cfdb812fe2b0a168d44d6bf5119b27f81ec7f87cf4b561bf8902bf3e512078e
font_02_sfnt_off00010c25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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