Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ae956da6fa3f69b…

MALICIOUS

PDF

81.7 KB Created: 2021-09-07 20:23:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e7feb9d6459221e7ed6a1c71d3d9c450 SHA-1: fb427f6a5cfc023e9cf94253c2e25a4c9268ac1b SHA-256: 8ae956da6fa3f69bfa46caac4097faba784813da19f315572d860e65f406c321
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, indicating a likely attempt to redirect users to malicious content. The presence of external URI heuristics and link farm detection further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://banglenhospital.com/UserFiles/File/85350744977.pdf In PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/00801686a228e1d094d2d0f8fed4426f/xojijivuku.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2cf921135---98711568450.pdfIn PDF document text
    • https://starbox.fr/img/files/ropeluropajetuxelerak.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16093cc73e61db---lojomegiw.pdfIn PDF document text
    • http://rinsacars.com/files/others/zabetixividitulefopidume.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/tebotetudibopib.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/n88lpigtm9lj6mq5f8h1tq6fv2/10415977097.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16096415d3a228---tuboj.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/tutewiwatetimewosudu.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16124f0be5c0b7---84643804220.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/60635928838.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607678d44f16c---61735864297.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/3994cea8208b866d1805b3a6e4e4dd27/bepurafuwasafutepazevepe.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/zitib.pdfIn PDF document text
    • https://badoza.net/userfiles/file/bowegunife.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/67328222589.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607313d8a87a3---8266493731.pdfIn PDF document text
    • https://dabanbep.tanglehadong.com/upload/files/fajubetip.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/luxemurimegojonapegamu.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/tajuforobafagesi.pdfIn PDF document text
    • https://angkalaris.com/contents//files/98920535216.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/vf7h6qf6upc7542cmmtq6abgt3/41224631184.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b05b3e06dab---81121198613.pdfIn PDF document text
    • http://cuatudongnhatrang.com/uploads/files/26548234856.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/c3db5ae991f94f33f3832aa4103d70fe/dexixagupejoxed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=circuit+wizard+manual+pdfPDF 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_off0000db05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB05 17224 bytes
SHA-256: b109c8d0bf6a4e190cf2fadcd5739c7cb5e4b4f2ed3ad12a20f6e2bf738f0afd
font_01_sfnt_off0001075e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075E 10636 bytes
SHA-256: 833c96d754064de4bb220494e92579f241d1fc10316fd7734480e232bc2c2cc4
font_02_sfnt_off00011fc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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