Malicious PDF — malware analysis report

Static analysis result for SHA-256 98947354ba0e3dc6…

MALICIOUS

PDF

73.8 KB Created: 2021-09-02 15:56:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4aee9334704e4fbf528d867e2b4f1c96 SHA-1: e411b90f019bb16eb805a376c34744124a0fb120 SHA-256: 98947354ba0e3dc68f0cbbb9df5bb9abe547721f4b7ea856a270544c45d72343
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a large number of embedded URLs, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. No scripts were extracted, but the presence of numerous external links indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://infrive.ru/uplcv?utm_term=vissim+11+manual PDF link annotation
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16090189a13147---nelomokawogezaxelubele.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160862ab22a3f3---40857768336.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073452b942c2---88748904168.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cee85d94e8c---kunalabufimubujesufaxipuz.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/36496dea4da55a1fd29e45a4b989172f/4000625713.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/78239377989.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///72944221756.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210507150305150.pdfIn PDF document text
    • https://sieuthigo.vn/upload/ck/files/82097213352.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bef39988e14---lifefafefolisupiwo.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/66397882707.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/n86jjmt40n7fg6lu91kfhqbo0k/dadinut.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/27423983441.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/tizutojokelito.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/slrr3dj2ccprpte31iu4715qd0/loxajipimanonutapat.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/fisuwosag.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093fd060959f---10612972244.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/70479222651.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/sonuvanogisolegejirane.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/xadonefed.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/s02bhcfunctb0866lnro12epda/34863359358.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/992f21da58d82836c33cf30aa7f0f9fc/fenatokazafupawujemubepe.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/5bs070t5pou7f553iussdfbcj2/lopubudime.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/55db8756f641488d81edcfb40f323b30/kinemopik.pdfIn PDF document text
    • 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_off0000bf1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF1D 9940 bytes
SHA-256: d8e9204c0f22b53de02d79018f6798c38cd20bc8958f4581e223db9f975d79b2
font_01_sfnt_off0000d4fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FD 16736 bytes
SHA-256: 079b39c4ede15bc1336a15d446dd57cee7c15c91e29d0b10d37c5760f23b9220
font_02_sfnt_off00010066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10066 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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