Malicious PDF — malware analysis report

Static analysis result for SHA-256 a356aba215c75305…

MALICIOUS

PDF

70.3 KB Created: 2021-09-17 10:30:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 303872f05dd3b1d5e1b6271061871c9e SHA-1: 37b612e33ec896447180881faab24e0dc7e4ee8b SHA-256: a356aba215c75305af789f8d7b92e270d19c7d0c7417e2dc61049f459aadccdc
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Several heuristics indicate the PDF functions as a link farm, with many URLs pointing to compromised WordPress upload directories. These links are likely used to host malicious content or redirect users to phishing pages.

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://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613debc758015---kosanuxez.pdf In PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/54850491544.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0675a5070---kubopegiw.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/80681302680.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/50575602462.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16140b8cf7ce36---migipetokif.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/43771773739.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/25737454731.pdfIn PDF document text
    • https://kfmaccounting.com/webroot/img/content/files/1547234645.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/57259895617.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143361e695ea---gamesa.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/i1s5vvp7hkn9u68golfnob2u27/72184657838.pdfIn PDF document text
    • http://climtech.com/files/files/15387023722.pdfIn PDF document text
    • http://gemcom.org/userfiles/file/2141123415.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/xewava.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/bodiwilizote.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/78449568356.pdfIn PDF document text
    • http://th-hl.com///upload/files/89422524529.pdfIn PDF document text
    • https://rgcsmt.org/ckfinder/userfiles/files/38777079128.pdfIn PDF document text
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/wasopuzivolitamowezakubi.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents/files/82394061755.pdfIn PDF document text
    • http://grimastone.ru/files/25174105661.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/45639382619.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/navikowidubugadixawosulon.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/sepewopu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=step+up+3d+putlockerPDF 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_off0000b346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB346 15904 bytes
SHA-256: e8e1af89d672d55bdc3de0df22d0307c8597eb59796db6013c5e81eeb7913f13
font_01_sfnt_off0000dbe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF400 10420 bytes
SHA-256: 0302c001386c6fffb6f2c82207ff032b864833ac301697a7d8c29a1e439b6174

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