Malicious PDF — malware analysis report

Static analysis result for SHA-256 df1215860176102c…

MALICIOUS

PDF

81.7 KB Created: 2021-10-13 01:20:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 125b731a6ea7b53e1b89ea4fe9a228f0 SHA-1: 0661e600079001473582124c66b189e1f404793a SHA-256: df1215860176102c2426f1f927ac4f39d233fa5a83ea1ffefbeede1224412238
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are identified as link farms on compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://crysiq.ru/uplcv?utm_term=as+if+though PDF link annotation
    • http://tevukasveza.lt/ckfinder/userfiles/files/loxarirosemapelarekulume.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d5b52fc3f---23828312666.pdfIn PDF document text
    • http://zjgjqmr.com/v15/Upload/file/20219111436261715.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/gexekoloviku.pdfIn PDF document text
    • http://wedooverseas.com/userfiles/file/jesitolusevugogijemojuno.pdfIn PDF document text
    • http://orangcar.com/app/webroot/upload/files/14743588518.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16159b07eef44b---40138138592.pdfIn PDF document text
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/60854089360.pdfIn PDF document text
    • http://na3.it/misc/file/koguwalowivedalenone.pdfIn PDF document text
    • http://bainihu.com/upfiles/editor/files/sojokenujolafuzitato.pdfIn PDF document text
    • http://autokolcsonzoszolnok.hu/admin/fck_upload/file/6669508945.pdfIn PDF document text
    • https://equinox-e.com/upload/UserFiles/file/nomuta.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/dd38de9cf058dd35eefd790e1ae13c61/tolomilikiligefuxovifaxam.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-4/20210904184710723863.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/voqj7l0cvseenq783kcjk2kcn3/95572054813.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/rexali.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/97121089429.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/12833967642.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/3337767858.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/mesagukilijuziku.pdfIn PDF document text
    • https://restaurant-kamkok.fr/img/Data/file/20284965982.pdfIn PDF document text
    • http://ydyb.com/filespath/files/20210903065911.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/86096378999.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_off0000d6d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D8 10028 bytes
SHA-256: a00065abb553198037016caa78a1bc2c64d3507efc48b85260cc9fbfd67a30ca
font_01_sfnt_off0000ed48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED48 20024 bytes
SHA-256: b8145f233b6522b048ceb1ffa3de0c2de1ad3cb533f554a13732fcd27ea41fe1
font_02_sfnt_off000121e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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