Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e852d138ead254b…

MALICIOUS

PDF

73.9 KB Created: 2021-09-03 18:21:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f8ad19e09f32b1bfea5648c682e9b9f7 SHA-1: 043927e841337a26986eede2ac77ff904fe80621 SHA-256: 1e852d138ead254b9ae6b5c1508b03bb332a70212112bf5d193faa3c60eccc10
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Static analysis revealed it functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting domains. These links are likely intended to lure users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://exdebt.bg/userfiles/file/gikozegidi.pdf In PDF document text
    • http://3e3i.com/UserFiles/file///47255336225.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/1fbd4cc43ff0730a02b78a96ba7a7265/59270526727.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/90141651283.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/miderudevugiranasobezagon.pdfIn PDF document text
    • http://pincesorvarshop.hu/editor_up/47350703605.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/49307457040.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/43716401190.pdfIn PDF document text
    • http://eastwoodfamily.net/userimages/voxuziposaxuforeja.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c2bb01234cd---54708355098.pdfIn PDF document text
    • http://skomi.ru/img/files/file/mivigitawogazo.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/8edbc383ed0c7145cff3c9eb44d297df/wotivaxawibopuduluxerik.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/95248837821.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbcf6861d2---3487186455.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/mesurusad.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160868e4c4f5ac---84889347998.pdfIn PDF document text
    • http://fkhd.cz/data/img/67576704164.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160726d293c140---13808275350.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612bc1068a85d---27433920539.pdfIn PDF document text
    • https://istanajpdua.com/contents//files/89615843286.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/xukexagi.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608388c8ec2ab---77431955052.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d44be1d233---motojatamamuguk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=columbia+chronologies+of+asian+history+and+culture+pdfPDF 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_off0000bbb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBB0 16892 bytes
SHA-256: f8d512cfa5ff8ee1ec0abeffc712a4c6a4a81f67c926b17326f3d83208016947
font_01_sfnt_off0000e768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE768 11452 bytes
SHA-256: 59162cfce426464a6b49f55e6a03a86189747f33846f0074618f1170daddb87c
font_02_sfnt_off000101ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1