Malicious PDF — malware analysis report

Static analysis result for SHA-256 153907f05da4b957…

MALICIOUS

PDF

85.9 KB Created: 2021-08-21 16:48:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6b817cc889b1ecce0f11a503599ef349 SHA-1: ad608e810e3ab0b4909b176da24b446469f298d5 SHA-256: 153907f05da4b9576ba4d9c33a0faf89e17df771e2e59f2aae158525b3d3ff97
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or malware distribution lure. It functions as a link farm, with numerous embedded URLs pointing to compromised websites, likely to redirect users to malicious content or phishing pages. The presence of multiple external URIs and link farm heuristics strongly suggests a malicious intent to leverage these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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=krups+coffee+maker+clean+mode PDF link annotation
    • https://igraonica.me/userfiles/file/28790248523.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/waxopidezezasojupexusu.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/35936349872.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/sigefedinepokisujogokofe.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/45275244331.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/93920237061.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607821016fc44---dupugik.pdfIn PDF document text
    • http://alwaditrading.com/userfiles/files/lojes.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/752d6d2c8e8d92af4d3778a7809525d1/88661768550.pdfIn PDF document text
    • http://lordbeaverbrook1973.com/clients/76835/File/wotivopogujuzemuwejedi.pdfIn PDF document text
    • http://clarkstownhs64.com/clients/2/25/255c49a504cbad61718694d8b78dfcdd/File/20252119293.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160890db3cba83---39708573367.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/26705557445.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/89879039389.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/12321017681.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/cmgd5sj2401qdi27qghpnqsr9j/63044811807.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608f847291760---33481580696.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769041c5e84---kemogevufoxax.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/rupunelikuzibuvomaw.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/c7d7p0jj30q0b8kgqqie495pd1/14956222291.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/6476850810.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/3feupi74odch9ahles1tl96408/zazajadamijuserutujawo.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc639d56961---14225724086.pdfIn PDF document text
    • http://poiskvod.ru/images/file/zikuguposokimox.pdfIn PDF document text
    • http://briquettemachinery.com/d/files/ridiv.pdfIn PDF document text
    • https://grandegroup.net/files/wunivezotosumorufov.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/powuxulenogorar.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_off0000ec66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001047d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047D 10772 bytes
SHA-256: bfd0f43b2b615b3560ec6b8320ac016458231c7bc925d541a2cc4b8374d0d032
font_02_sfnt_off00011d45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D45 16264 bytes
SHA-256: 05432dfcc56e7d75bdc1ec7d23e4d77f57bd4e703278d567b77cc51e7f639652

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