Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4abd12edd5a621c…

MALICIOUS

PDF

84.9 KB Created: 2021-09-08 04:29:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1d7f6f64058c57b643c7490298331d9f SHA-1: 26c1eab8a4252693d2b10e254c49ade5b3f2b8ee SHA-256: d4abd12edd5a621c61f28111b3b0fd20498eb7bf497b4c803a7ae700a1173b98
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It functions as a link farm, directing users to other PDF files hosted on compromised websites. The presence of numerous links on disposable or compromised hosting suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://sherwoodchambergolf.com/ckfinder/userfiles/files/79777651003.pdf In PDF document text
    • http://ncdesign.it/userfiles/files/ketifikovemiku.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/b5dfdc6a04762bc03b397b13cc038d82/16311585478.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/80180763340.pdfIn PDF document text
    • http://sb-78.ru/files/file/67441651887.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/boroluwedisovoviruda.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b784727ee68---2886076347.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/luzilivebew.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210710061704.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf953244a8---94463527503.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/zorapezizixadudigepiwuwuz.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/tojefew.pdfIn PDF document text
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/fupotejotavikejewe.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/qid2p8f48m52el9up10nolp029/40776794579.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/wutadujitekazukiliw.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/48634530034.pdfIn PDF document text
    • http://zerosquareonline.com/file/58948465959.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/37266611407.pdfIn PDF document text
    • http://sparkpro.lv/content/file/pofasisululeledupag.pdfIn PDF document text
    • http://sportsclinicwest.ie/media/contents/file/55937628845.pdfIn PDF document text
    • http://grimastone.ru/files/labujinezuvafexujepol.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/atr41k2dhugl64ivvtfgmebad1/fipodutofarid.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/631895af120aa8e21b335f926d1e7ea8/83587474086.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=showtime+rotisserie+oven+manualPDF link annotation
    • 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_off0000e32a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3C 19428 bytes
SHA-256: 49ae0c5a02d8abed0b2744e880de5792475aceee6f689a056a3056b48525933b
font_02_sfnt_off00012dda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DDA 10700 bytes
SHA-256: 274484d784cb6049b0eb3e2f7b7074c28642872bdaa34121123a6f1a6f8a9227

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