Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b0461846c629784…

MALICIOUS

PDF

85.7 KB Created: 2021-09-15 19:34:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 97406446985935243726e2e902542eec SHA-1: 4213b99604b3c9cdd66d784e70cd90f5f6353be0 SHA-256: 6b0461846c6297840e1b0ed24645b12f804372187669f123b01446b6e2a1277f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms, many of which point to compromised WordPress upload storage or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of 'utm_term' parameters in some URLs indicates an attempt to track user engagement, likely for malicious purposes. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://crewmak.ru/uplcv?utm_term=lightroom+crack+for+pc PDF link annotation
    • https://ksi-system.pl/editorfiles/file/togorilegavufalutuvumo.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613999ff0fc71---batesulunaselisitopulaxad.pdfIn PDF document text
    • http://www.fdconsult.qa/public/uploads/cms_files/52236725550.pdfIn PDF document text
    • http://smirna.pl/files/file/jijatogijafopikutemu.pdfIn PDF document text
    • http://theaterbuehne-schwandorf.de/userfiles/file/vozoduzolopop.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210911031104_1gem6a.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/78041082680.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f95601f576---refot.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/dasowexi.pdfIn PDF document text
    • https://seerupit.dk/assens/file/73537380824.pdfIn PDF document text
    • http://mycoapaisyl.com/webimages/files/74211441708.pdfIn PDF document text
    • http://vietsaovang.com/uploads/userfiles/file/duterizovuwux.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/wurunorukifetobibomaxasi.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161406670cdfc8---zaduximovopito.pdfIn PDF document text
    • https://trexanh.net/upload/files/79171895211.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/161357dc629022---savez.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/bopegilatubadazoravolif.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/letuxeligemurad.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/24824021228.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/lizawuzefonebov.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210910205426.pdfIn PDF document text
    • http://music-saikung.com/ckfinder/userfiles/files/xelufosesadelewaxa.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/77b73341a2c493c1e283cfba2287f43f/kunopajediwur.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/wikutegowuxibep.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/ledupiramosuturezuv.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1613772c226e33---54800898777.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_off0000ea6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6A 10524 bytes
SHA-256: a3263f3c84525a31f656c44dc7cc0d2850f9654978be8272cac87e3959c0e4f8
font_01_sfnt_off00010264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10264 17908 bytes
SHA-256: b6a6bef0dfe93db9bbc9d97f292ec89688b5a8f8e76e002dfd3280acad576609
font_02_sfnt_off000130c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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