Malicious PDF — malware analysis report

Static analysis result for SHA-256 835e6a74a68a3894…

MALICIOUS

PDF

69.4 KB Created: 2021-09-19 10:05:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3af888616490d7add71f7ad1e3b8c1a1 SHA-1: 6b74b03eba8c335a66ce0f25ee3a62febc170e99 SHA-256: 835e6a74a68a3894fbaaa9ea04a6ccc70e4c0088b71a8fec45abd0f051b935ad
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, with many distinct hosts and links, some pointing to compromised CMS uploads. The ML classifier and ClamAV also strongly indicated maliciousness, specifically phishing. The embedded URLs likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/uplcv?utm_term=android+google+login+api
    • https://kawanmto.info/contents/files/55091449431.pdf
    • https://noihoithanhtuan.com/media/ftp/file/78886719447.pdf
    • http://smolninskayahotel.com/userfiles/file/faloji.pdf
    • http://xyr59.com/filespath/files/20210912110658.pdf
    • http://www.jasfec.com/imgs/uploads/gasetesemizirezobeman.pdf
    • http://rioairporttransfer.com/ckfinder/userfiles/files/68229785658.pdf
    • https://trexanh.net/upload/files/70699521354.pdf
    • http://unseretochter.ch/images/file/kofinipigap.pdf
    • http://astprom.ru/sites/default/files/file/pebolebufumera.pdf
    • https://vas-vill.hu/userfiles/file/31512069859.pdf
    • https://aldurra.ly/images-editeur/img/file/98983142025.pdf
    • https://immobiliareincentro.it/allegati/file/42402020468.pdf
    • https://amzentransportationindustries.com/admin/imagetemp1/file/10652053891.pdf
    • https://kaptenhoki.org/contents/files/bovunalawinezod.pdf
    • https://capitalsyndic.com/userfiles/file/75147171475.pdf
    • https://piphoto.tw/uploads/files/202109140045101817.pdf
    • https://rwd1.thadv.com/upload/files/97029090982.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143a0fcad515---42088886416.pdf
    • https://hobbes-group.com/upload/files/13846802808.pdf
    • http://newo.ru/files/files/fukawuwojuzaraxos.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/44ce67bd0f9c415ac9263ded317892dc/gevuvodem.pdf
    • http://tugrabilgisayar.net/resimler/files/munijep.pdf
    • http://cwesp.biz/upload/file/mitetomiputazela.pdf
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16144502b1241b---90401130949.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b230.bin
24f6303524e74ecf4276b6e96035be07d132a0800cd433a68a7579d100a5d17b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB230 15260 bytes
font_01_sfnt_off0000d90d.bin
f1d681937b860647bfdb510d59ef5893d7f7f4a69c2defe9102febff44e0d462		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD90D 10280 bytes
font_02_sfnt_off0000f008.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF008 16792 bytes

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