Malicious PDF — malware analysis report

Static analysis result for SHA-256 83d5adec1117be64…

MALICIOUS

PDF

76.1 KB Created: 2021-09-01 23:24:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5bdb5b4fe7346fbe729817aadcd6547d SHA-1: f6269f18102c4bd952b0549555de27458c1987c0 SHA-256: 83d5adec1117be647e68307325333be8ec1484df4f2c8a6a76ca09266900b2ab
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is identified as a link farm, with many links pointing to compromised WordPress upload storage. ClamAV and an ML classifier flagged this PDF as malicious, specifically as a phishing trojan. The presence of multiple links to potentially malicious sites indicates an attempt to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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=farewell+my+friend+meaning PDF link annotation
    • http://bhavalaya.org/ckfinder/userfiles/files/20828678934.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/49902675403.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/xejakitufekivi.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdeb05908c---12935424170.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/12912642787.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121807b950cb---56253829751.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610dfa658653a---terun.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/lazavogawudedeji.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/desejawitokiba.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/97193393067.pdfIn PDF document text
    • http://capableapp.com/uploads/files/89052046156.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/71410357967.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/e634fcb73964a7df1cb43f91b53dcf19/lawipidalobalizajever.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/32700725659.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/18f9db6560e77452f0f5338eb8721641/tepotewuwuvipevavas.pdfIn PDF document text
    • https://hotelite.in/userfiles/file/98407178422.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/imsjjpg7730u4evtg4p7d6d0ur/nupejojulezevemesediguz.pdfIn PDF document text
    • http://husplaza.hu/editor_up/65674560333.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/29a8e3dd230880f1db694682d82430ba/zivivafofikesaxave.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/madolutimulerujexoro.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/68553156797.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff59a03da6---31162202317.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/26038450401.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/5cf8e23db42ac07c2154206275d94037/76132444427.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_off0000c2b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2B6 10488 bytes
SHA-256: 1416d076dfb67a6a4991e95b7579c414e92c8f81d2767262f4fed69e998d0929
font_01_sfnt_off0000da49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA49 18916 bytes
SHA-256: 4839351b7805d523001202df5beec62e9f96480ff6c9e43c04ffb7f90b6458c5
font_02_sfnt_off00010b17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1