Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a8b17c283d1a6b9…

MALICIOUS

PDF

148.1 KB Created: 2021-08-04 03:44:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ba3c4d5ffd86b7d01fecd6f2e6c56435 SHA-1: ccc4052c4e88da0ffee7d66297d6dbcb4197dace SHA-256: 3a8b17c283d1a6b9ee67d47af087953235a8ae1418c365acd01031d47fd9ef46
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9782

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://irlanc.ru/uplcv?utm_term=noam+chomsky+syntactic+structures+pdf PDF link annotation
    • https://vietfun.com.vn/wp-content/plugins/super-forms/uploads/php/files/cgf9gunp3ql1mnhucb3ctomb7t/romowexapakanejuvagefiv.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/23450263307.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/96481288524.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/60357144131.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/tixorom.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/3165859891024a350e95d5e1d913ada0/21144342201.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/60790966239.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/vuwovepozig.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/86261147535.pdfIn PDF document text
    • http://monkeytailranchdonation.org/clients/e/e8/e82116dd0b5861b0917add2a69208af2/File/jifanibuvafunulamimamo.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/7qsj43m1doabuvasr8u2sp6r48/34106323642.pdfIn PDF document text
    • http://prota.ru/upload/files/zapiluxu.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1607c126116ea3---xudefawemidovudom.pdfIn PDF document text
    • https://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/ec141bd8e2e83244307472aeefb62e9f/vaveluxokuxolavobozupemis.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/menetigutosutalunepe.pdfIn PDF document text
    • https://szud94.hu/img/sajatfile/files/79027814028.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/20354104675.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160dda6b92fb11---66670344751.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/6faefebf53d3fdcce513ee5175388ce1/wusefadepafafuri.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b3fe4c629e4---boluxorivuri.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16103966d32952---konovunerasoxamifupukuje.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/3464102787.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001cf43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CF43 2604 bytes
SHA-256: 4c4f37dca7bb31cd0a04becb1ca3cd195a3b4d6f5156282a670b7dac940b6229
font_01_sfnt_off0001da58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DA58 11124 bytes
SHA-256: 306ad6dab0ddab49578806c7dabbe38e8f4eaf12be17034ee25ba61ae7f8c580
font_02_sfnt_off0001f431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F431 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00020c43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20C43 22192 bytes
SHA-256: c3dc5d0a1d74792abbcfd9d299803136b60f569255ed506ba58ed11071064ea7

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