Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6453ab400c0989e…

MALICIOUS

PDF

89.8 KB Created: 2021-09-05 05:47:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3a46f5137680d04588e1ef6d9237c034 SHA-1: d08831df922c18bd9ec9837b535d6f193000c30b SHA-256: a6453ab400c0989e2c5a67dfbd0325278a5fdcb6ec1dd7a9dcb746dbc3e0944f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of external URIs and link farm characteristics suggests an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://coretry.ru/uplcv?utm_term=gender+studies+pdf+book PDF link annotation
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a89d114f098---kisozajidem.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202108110525047029.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/f4d391e6c56ee476d4db7a5d968cb598/zedovaduzoviremerup.pdfIn PDF document text
    • http://apple888.vn/luutru/files/lirefer.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/gutuzezozepufir.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/mvuic96udmpkqeb6qjog874gfg/wewanapip.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/zefesuxetupuzoga.pdfIn PDF document text
    • https://easternresources.net/ckfinder/userfiles/files/gimitan.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/200ae2882692ceb91e69e78a7c9cd4ac/jiruwanebegujil.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/01476d7415c58579e706a9c2e098f2ed/10531115718.pdfIn PDF document text
    • http://haai.org/upload/file/tedutemetamelenupaju.pdfIn PDF document text
    • https://cian.hr/userfiles/file/gegodajivedo.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/suleluk.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/v4f914b5g9qh14clbvap7dol0h/tepexilurivariv.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/fosorubagemojeris.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///30155174908.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1612be897097d3---xoxazebixetox.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160875ceb15b8c---jovobutofo.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1611d1ef316ef7---13540823575.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160908c365d49d---tamanetepojafuxilotojeri.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf941508dc---jexipuzakuberuvasasabej.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/9lhjd78d7vofe36q9alb4ldn3b/xonofogopugutonogunil.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/26691007230.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_off0000fcb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB6 10656 bytes
SHA-256: 70cd646db134ef8db08ee68c92d1caf8264b2b1637ebb09e98a96e16d05e8f9f
font_01_sfnt_off00011503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11503 17348 bytes
SHA-256: 30cff1024c45c33dd985ad3614353caf737c9fa9c0cd0f1ce8978727e8d325e5
font_02_sfnt_off000141fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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