Malicious PDF — malware analysis report

Static analysis result for SHA-256 0022aaf60333f9e9…

MALICIOUS

PDF

83.1 KB Created: 2021-08-18 16:07:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f09dd9fd678a05fc986761739a875244 SHA-1: fcd13b53d0b09e0825cf9ccbf892bc81288ff2da SHA-256: 0022aaf60333f9e996e81951dff22676231bec93042101f3123038a1180f8412
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to other PDFs hosted on potentially compromised or disposable domains. This suggests an attempt to lure users to malicious content or phishing sites.

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://bevasilicones.in/userfiles/file/67548197356.pdf
    • http://bethelhanberryaaa.com/clients/2/24/2465ef4bb9bb1b7382310ae17d7cafeb/File/3185803570.pdf
    • http://canadapremiumlubes.com/survey/userfiles/files/pajog.pdf
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/pabisawejulogufuva.pdf
    • https://advance-pack.com/editor_upload/file/noxozivaputuva.pdf
    • http://vandientuchinhhang.com/upload/files/88647426828.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a288413d6e6---jepoximevimujowolibe.pdf
    • http://drkoopman.nl/cmsimages/file/retisiwikili.pdf
    • http://candientushinko.com/images/file/sovonutidobopupa.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/84fdf8b66a25610968389d043ea77093/61686711855.pdf
    • http://ping-property.com/user_img/files/zagadopetiduwizup.pdf
    • http://nuraski.pl/wsg/userfiles/75547748645.pdf
    • http://novussiteyonetimi.com/uploads/file/rutikobazodiviji.pdf
    • http://beiks.info/public/file/41802097734.pdf
    • http://elsekmont.eu/userfiles/file/38363471416.pdf
    • http://marcobernini.it/userfiles/files/35738576481.pdf
    • http://iberia-ex.com/images/blog//file/65660780282.pdf
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/16095bc5f22938---bifudetasaxerudazitiwilib.pdf
    • https://diphong.com/uploads/39249813732.pdf
    • http://aceonlinementors.com/userfiles/file/17928124799.pdf
    • https://red-adlay.com/upload/files/45546422484.pdf
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021071411441780554.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=google+docs+voice+typing+from+video
    • 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_off0000dc43.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC43 16792 bytes
font_01_sfnt_off0000f45a.bin
069befc53711c85816ec1865157b4d751440dacd4df94e45ce29718ae8033bd6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF45A 11020 bytes
font_02_sfnt_off00010dcc.bin
5872f7f7c994739805e5c080df5d1fecddca01536ab95403d5abab6f954b7e83		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCC 18356 bytes

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