Malicious PDF — malware analysis report

Static analysis result for SHA-256 a800d343c5035479…

MALICIOUS

PDF

75.5 KB Created: 2021-09-19 03:23:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 1c5b615c8f9cbab41607402aa2640662 SHA-1: ef497aa094ed412dc41fa6f0e5e19b9d1fb0d63b SHA-256: a800d343c5035479db9e95f222c22629acecaba950876efa466b1f2caaa3dd43
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to act as a link farm, potentially to improve search engine rankings for malicious sites or to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://wastran.ru/uplcv?utm_term=watch+justice+league+unlimited+free PDF link annotation
    • http://pokrowce-ochronne.pl/Upload/file/40243334396.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161333fa6d25e0---fapugiforaf.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/0f50368fc73f64d78e501d78e6c08f97/lamatidatus.pdfIn PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/manitijipiwewuzepen.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/64729398329.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210909081442.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/96516414885.pdfIn PDF document text
    • http://bantinnhadat.com/users/files/xunenutujofumevet.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/76762523528.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/lulofivoku.pdfIn PDF document text
    • https://cakkue.com/contents/files/pevugegixosetun.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130527f6ef1a---piwefetogitujeperogefomud.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/48240994812.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/jigaromas.pdfIn PDF document text
    • http://usairsprings.com/userfiles/file/nirakolusizixoj.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/35652658064.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141ee84200c6---rebudepasuperer.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/4438515382.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/duburirinezabu.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/55934854787.pdfIn PDF document text
    • https://pracowniatechart.pl/fckpliki/file/6109398395.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/jexulusuwujet.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/gimibonugogug.pdfIn PDF document text
    • http://pronobile.com/catalog/file/12347729884.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_off0000c284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC284 17492 bytes
SHA-256: 11e08beba46153bef93d7c9cc80786526e398c1c2dcde08e8d713c6f1b82d8e6
font_01_sfnt_off0000ef25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001073c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073C 11024 bytes
SHA-256: 2f6c84d5d738afa651009a3bf65efc0f99ae6821201dcb8965598bd8902e12ad