Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b18922373dde7f6…

MALICIOUS

PDF

94.7 KB Created: 2021-09-05 00:56:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9b91eafd1d3a87b261ca9d21e0dbb440 SHA-1: e8f5bb8920072f9bcdf71bfa97d357520c778f7c SHA-256: 1b18922373dde7f6d850e24fee21d79ecc9aa0a5f7eaaa63aad96ae05fe8d374
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF was flagged by a machine learning classifier and ClamAV as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting an attempt to lure users to malicious content. The primary attack pattern involves directing users to external links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://teplospectr.ru/images/files/kivesep.pdf
    • https://cape-electronics.com/media/file/68224549837.pdf
    • http://nothingelsematters.net/pharma/images/files/manirove.pdf
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/jusojewilefolufipa.pdf
    • http://ajisushionline.com/uploads/files/pisiritanupabil.pdf
    • http://cnex.cc/images/blog//file/lumuwakasulugafud.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ff7f8ae7b78---65293980626.pdf
    • http://melinterior.ru/userfiles/files/40116338760.pdf
    • http://nousgarage.com/userfiles/file/95825829462.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126d96097ee1---39893106718.pdf
    • https://puppometalli.eu/file/dudegomejitibinaperufin.pdf
    • http://glenbrooksouth1970.com/clients/1/17/17fc1bd13d5538a69f39d58c869d2fc5/File/nukilokew.pdf
    • https://successalpha.team/upload/files/41157135987.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/29252a327f20264fd9956480291e5fb8/radelusak.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160b9dc62a942b---55999124224.pdf
    • https://hargagila.com/uploads/image/files/jetununafawa.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/98868092e44cf57510f06c264f89302e/fuvupobedawoxiwelimujado.pdf
    • https://www.mds-horizons.com/upload/files/xezuwatelem.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b661b50d047---diwufadaza.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096dc8e4c8a5---81858056884.pdf
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/75cd507ecbcb3a31d318b86a75033cf0/73663890531.pdf
    • http://hgbs.de/userfiles/file/xesafabikavakumopalovaban.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=mythologie+romaine+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105cc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x105CC 16792 bytes
font_01_sfnt_off00011dde.bin
f3d5e0871239d73e803846d359a49505e729fdcaff9a49876c72d8f5624e7e72
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDE 21252 bytes
font_02_sfnt_off000153ad.bin
29bf4780730cfac93268f9fa4e61695b251a45b939b49acfa20aca48602b57e7
pdf-font-stream PDF embedded font (sfnt) at offset 0x153AD 10884 bytes