Malicious PDF — malware analysis report

Static analysis result for SHA-256 db813f502cf4df5a…

MALICIOUS

PDF

85.4 KB Created: 2021-09-02 04:50:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 511153652f9417ee4ee7d1d0a25219f1 SHA-1: d9d84f262cb31747622640277e6c843c16627f2c SHA-256: db813f502cf4df5a5aff8808941258a4e74a26bc277b9f9e880bbc8c745d35e6
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to distribute phishing content or malware. The presence of multiple PDF link farm heuristics further supports this conclusion.

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 http://chamdure.com/DATA/files/10674408163.pdf In PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160b9953d17709---lotemubutepetu.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/67421585245.pdfIn PDF document text
    • http://ore-processing.ru/d/files/60735439589.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/kujipezitenereg.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/penasodedelevejudu.pdfIn PDF document text
    • http://torgoborud.org/images/file/dexovaveg.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b2957bb644c---72821757239.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/d47c7c79280d46cc199942eec755d934/4475542922.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/41171787687.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/4062c8f5c44c52a61cbb302019f81555/disujajuzutixoxevifezebiv.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/kuvezenigoxiwub.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/dizimomu.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/rmdqofa551gk1khq9dna3ul0o4/fumununawasoveb.pdfIn PDF document text
    • https://la-klamm.org/Files/files/45304266495.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/86905324773.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b506431b156---54283715788.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/92067149668.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/6b842c7827b9c553b87ad227f1bbe59b/vemoraboxedazoragetakixo.pdfIn PDF document text
    • http://badgerhillfarm.uk/71489777496.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/sisupewigudawirorupuva.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160999322dc5d0---walelozuxatavabawefefodaz.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/ebvouho5jfdi06k6ttrar53cjn/42279719256.pdfIn PDF document text
    • http://haumeaonline.com/userfiles/file/15606963462.pdfIn PDF document text
    • http://net-work.cz/data/file/30511708625.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/d2e77ea7173815f434d3182a01f3c1ee/noxefipigi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=drink+driving+lawsPDF 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_off0000e819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE819 18508 bytes
SHA-256: 20fee733c00fe7053b5eb27ef11949db8edbb6d72ba48fe337b4456b76075e59
font_01_sfnt_off000118cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118CD 10320 bytes
SHA-256: d8abd7f5d638d0afe29bc1f6c00f2d9b17a6ce061a16cf7a612279b292c67177
font_02_sfnt_off00012ff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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