Malicious PDF — malware analysis report

Static analysis result for SHA-256 52bc2e9d9a590fd2…

MALICIOUS

PDF

89.7 KB Created: 2021-07-03 19:29:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 5b19261b55e25a80f22077d7b90ababd SHA-1: 0ad445b732c69d292d4a5bfbc0e14bc1e15519f5 SHA-256: 52bc2e9d9a590fd266bcd518cce80c0dc3b580331dce4f715c96256e0cc71179
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and link farm heuristic indicate an attempt to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071cec94c85c---gapofubavopokolagevo.pdf In PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b79cb2504---47561433174.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/71957129549.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/zutowatatelupimeputumox.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/31421974811.pdfIn PDF document text
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/35310601413.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096c08e06d07---sekepilewopiko.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607086141a939---zexekajuga.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/gfuifk84u63j731pon3oj0v5tp/muwurik.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/vilunemosefafejuxemawe.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/xenunotavumapamo.pdfIn PDF document text
    • https://www.groupenahno.com/wp-content/plugins/super-forms/uploads/php/files/rfst8qtfngv21fln80k1gj827d/2420305744.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/25820844687.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/k9elfu9akhnns1hvo47qmn9vc3/73555587123.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/846ff0f982c48eba4f39d200b65e1669/60574554709.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bc0ce24dd651a48bee174834997f756f/tobulewinokiledukelu.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/9uest2dp3qc8fvin6kddnh7k32/58547373921.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/j2m45frnsap3lba05tot4fdpd2/genimedogekiluja.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/3qej5bpcpr4plim7dn65iosuoi/43448772259.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160954c981140e---92503500584.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775bc568763---magagag.pdfIn PDF document text
    • http://cutencuddlybreedables.com/_images/file/78887341014.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b2afbac648b---dufewodijarabavani.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/70614626045.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/5518371524.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=cave+diving+horror+moviePDF 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_off0000fabe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABE 10480 bytes
SHA-256: a857d57b021e5f8a733f6e98034a1758bd441e71760d861ffe5498bcb1602f26
font_01_sfnt_off00011219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11219 18076 bytes
SHA-256: e267cdaa5f3bd5ff71de792925a6a5a21faa3dcdaccd3216e7b00d15f659545e
font_02_sfnt_off00014142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14142 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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