Malicious PDF — malware analysis report

Static analysis result for SHA-256 997da3a06259e84a…

MALICIOUS

PDF

87.1 KB Created: 2021-07-06 15:42:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 42a5f35122621c7030705550430afe1c SHA-1: 84a74f30f052fe1cf60d35d19a96a363f084fe15 SHA-256: 997da3a06259e84ac3771abb049580c8998453bffb1723f46071f49e296d584f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, which are likely used to distribute further malicious content or phish for user credentials. The presence of multiple links on compromised CMS upload storage and disposable hosting reinforces the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://baraanduliaptti.org/userfiles/file/37295820805.pdf
    • http://tjclassof1971.com/clients/1/16/169b02496b2253913efe31a5b05f4f66/File/90912026401.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/e73521ad84523229967d85ff573ece9c/46097450962.pdf
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/27584083157.pdf
    • https://villatoscana-pi.it/userfiles/file/43948990345.pdf
    • http://n-production.com/upload/fckeditor/file/korox.pdf
    • http://riskhedgetech.com/uploaded/file/192926379360c1de8045071.pdf
    • http://climtech.com/files/files/bukutumefojifamafafufa.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ccfb06ca5---mejijowabiv.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/96b5463a119ea4fc40e472d611b5ecef/negivipitokijivetiw.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606f188eb775a---watujobulitudalunemajal.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16091e0d9cc939---webuwunevuzefalizesano.pdf
    • http://ricarda-allegra.de/userfiles/file/tajalakubawaw.pdf
    • https://alshamiltrading.com/alshamilfiles/file/zalipaviliwatugiwen.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c9bae8921f4---wiwupadazadategaw.pdf
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/0265410066e6c9795129a37b1d22bb13/70185016280.pdf
    • http://colorfusion.us/admin/images/file/jolurebubedugidoron.pdf
    • https://sailstudy.in/ckfinder/userfiles/files/79697372541.pdf
    • http://mfcwestenkwartier.nl/beta/userfiles/file/batilobekolewufi.pdf
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/b18s6k8b8ph1067vfq3bi4gguj/8054808471.pdf
    • http://ministerium.pt/files/bojoxafovuwavegufubero.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16070584c491af---96065954582.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=best+assassin%27s+creed+weapons
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f267.bin
0b15f766e9160f8f6ff98f73a57e8f694c4d5e159ac3aa3de6ec686982b7b5de
pdf-font-stream PDF embedded font (sfnt) at offset 0xF267 10636 bytes
font_01_sfnt_off00010aff.bin
ab0892a09f102363c09308e8c8d3d6e2793a59df096aaeb7e085330aa4014047
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFF 17044 bytes
font_02_sfnt_off00013737.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13737 16792 bytes