Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b5f2b65683b0b03…

MALICIOUS

PDF

71.7 KB Created: 2021-07-10 06:08:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: e4e0bcf30aacadf6a594bae903194963 SHA-1: f6dec33a0cb0fe1cbb9c920cf9c069609599bcd8 SHA-256: 1b5f2b65683b0b03babaafc3ba6d23dcb59e2e9832f458fc0ef30e8296b838f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of links, many pointing to compromised CMS upload directories or disposable hosting, suggesting it's designed to host or link to malicious content. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://pogotowienaukowe.com/Upload/file/30586196954.pdf In PDF document text
    • http://babamoleskine.com/files/file/44380928501.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160b48a5852da3---48489326651.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/44806605207.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607495e4deed0---tosopinukirivisoma.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/a80c88b159398d022392264536d7d6aa/rozidoto.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/293314ae46ded9ec0d8fbd9b15a4c718/munigowaporow.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/tuzune.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/8b0aa73cfd8d331b07140db0831df15c/fekumavaweriwevop.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/t1iculr585r2f9mds766vfbqj7/leruvurebaxazit.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/8e9d72e42912a77709c740ce1b353087/debaza.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608de24e538b1---tamaladefagukolom.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/03ts76ltdpuvrbkq90hqvdp161/6174813391.pdfIn PDF document text
    • http://jfe.hk/userfiles/gepejisugawogunonu.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607614dc24911---75630986844.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/17274087695.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/71565349869.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b9429f24071---xetazupelepugen.pdfIn PDF document text
    • http://northcity.rs/slike/files/serabigod.pdfIn PDF document text
    • http://siembra.me/uploads/files/bazanutifemodowukipoja.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/dfaa398baca21e8239f92df17803b93c/78639353291.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/95621db616bc7a24aa564f795f1cb51a/patatimabe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=kick+off+template+pptPDF 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_off0000b9b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9B5 10352 bytes
SHA-256: 4f08295f3210dd3e8371c3e4719674c82667241f40654ccbaa01d4e4657b9ab6
font_01_sfnt_off0000d121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD121 15900 bytes
SHA-256: c4cbc05fa01176da6e49a60c087864833f606e1383163a9b6951d180fad48736
font_02_sfnt_off0000f9ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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