Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c762aa3c57dfcac…

MALICIOUS

PDF

82.0 KB Created: 2021-09-12 06:35:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e95648a207861975b06095e381678784 SHA-1: 7ec8bdd0b348248d1277712be052638b6b15fc8b SHA-256: 1c762aa3c57dfcacaaa034ff738585935cdb0189f0e36dd3dd142d67a7bcaf6e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The presence of external URIs and link farms suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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=transfer+sms+from+android+to+android+via+bluetooth PDF link annotation
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613618a5d7a81---52680313221.pdfIn PDF document text
    • http://realfootball.gr/userfiles/file/gonewew.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/difomufasadepagis.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/17047869116.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/24275669134.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/bimod.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16132b02fe984c---zomisaza.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/nebutinakok.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d638831be4---2116095922.pdfIn PDF document text
    • https://jmbarrenetxea.soinuenea.eus/files/galeria/files/lulox.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/79403820095.pdfIn PDF document text
    • http://www.gitialiganjlko.org/ckfinder/userfiles/files/6335014430.pdfIn PDF document text
    • https://jeneifogaszat.hu/cikkdata/files/65361170317.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/65727069604.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/35084591206.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1613581417f973---34828128137.pdfIn PDF document text
    • http://allineers.netlovestories.com/upload/files/naluzivexexepawisip.pdfIn PDF document text
    • http://bassonconsulting.mc/userfiles/file/34953631296.pdfIn PDF document text
    • http://slsnn.ru/content/files/makusirobizijobajirubusox.pdfIn PDF document text
    • http://baruraprotidin.com/assets/ckfinder/core/connector/php/uploads/files/lasikizikito.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/28015960966.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/zirojogetovujovopanuvod.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/80416958739.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/58379481444.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_off0000da8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8D 10888 bytes
SHA-256: af0400032452eef0512a5fa1713f4238e5438cd2010e842dd0be660d50c9c38e
font_01_sfnt_off0000f384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF384 18072 bytes
SHA-256: 5f6facb8ce5120e7e39fef341240279c7cdea8d913fa527d7ea02c22ced563e7
font_02_sfnt_off0001222f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1222F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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