Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ab46419e43e9b1e…

MALICIOUS

PDF

76.6 KB Created: 2021-09-06 23:59:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a41c6432ee0b602f01bbd958b2c7c2f1 SHA-1: 07af721f447701c150588d3153ef08e2fa8221b3 SHA-256: 3ab46419e43e9b1ed294e9e346abe6db9232f4d7c7f2c2093441ac53959b0786
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 or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://chcial.ru/uplcv?utm_term=worksheets+for+1st+graders PDF link annotation
    • http://onestep-tokyo.com/userfiles/file/2467306515.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/ruxewiwifiwarezira.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/12302702879.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/bf077c704e833de51e5493a1d6aa69c8/xisevejos.pdfIn PDF document text
    • http://bienbao.org/uploads/files/10807817012.pdfIn PDF document text
    • http://montazerangroup.com/uploader/file/10431932469.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607439cccb786---nonalab.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/85788469460.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/84033027572.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874e86a92e0.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3776c0d513---79268895838.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608511aae3329---10604870708.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/88629096400.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/m7f138celpp7sdlsmkfci1d2f0/nevajexenoganokuxofadiw.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/kawatitanib.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/toxumafafenekiwexip.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/a23203f697c33077b812ec955b1b747b/xofusazoxenoradotomonupal.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2efa64ea1---10542504909.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6447d36e5bb1790ada960877bfc86234/togolijag.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/80713405157.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/banasi.pdfIn PDF document text
    • http://strandedtattoo.net/file/97701825651.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210623_602CF770051DE539.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ee0c7902c88---34023446426.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/af746a64e8d6c848ca88dafbd82814ef/9207620499.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/44677070963.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_off0000c944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC944 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e15b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15B 10528 bytes
SHA-256: d9f209947a5ab18cc23eafa1e35096de4ad7ac91261be6791dde4bf112057f86
font_02_sfnt_off0000f962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF962 16896 bytes
SHA-256: 21a840edeacbc7c8014edbb42906e74a5c880f9297aaff3d07091405bbd757c8

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