Malicious PDF — malware analysis report

Static analysis result for SHA-256 05b76c142bc4c2d3…

MALICIOUS

PDF

83.5 KB Created: 2021-07-08 04:42:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 1a817ee3c7cfbe58fb4c9002afe1ec52 SHA-1: 587453897971c4927584bef4fdb0f8bb90abc5ec SHA-256: 05b76c142bc4c2d3ee467c844669f54a8a202b64e4886964295dba2062067c1f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. It contains numerous external URIs and links to compromised WordPress upload storage, suggesting an attempt to redirect users to malicious content or download further payloads. The ML classifier also strongly indicated maliciousness.

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 https://irlanc.ru/uplcv?utm_term=general+liability+release+of+claims PDF link annotation
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a4395876c---35031964250.pdfIn PDF document text
    • https://elektrona.cz/files/file/43335798550.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/37767651725.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f01be3a16a---dalavavalobibonusuxesi.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210611184236_g4207d.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/nonaweraxeb.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/vebebubakufalonem.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c84499ae95---66368514436.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/b40a8e11fcde2e40a190448a09fd305b/lalemasoxo.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/34635582220.pdfIn PDF document text
    • https://spacio.hk/attachment/file/zikevabawuneraburudova.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/dba10332ccd7dd6e03adeafd57d09652/87393604660.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/236f2a9706384475b9616e1bf60c3740/70748572544.pdfIn PDF document text
    • https://ayurvedaemart.com/uploads/file/25447521336.pdfIn PDF document text
    • https://windsbs.biz/files/file/38662851035.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/nolikolakivifulaji.pdfIn PDF document text
    • http://unesco-mediain.cz/fckfiles/file/82555412717.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607557a81fa88---xixuvukujazinudivamu.pdfIn PDF document text
    • https://mattress-leader.com/media/gasuvobalijolemosovojapef.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/salelukeguvekeniwajananaw.pdfIn PDF document text
    • http://gibisch.info/files/files/purajaxaxonesepefof.pdfIn PDF document text
    • http://mdfgiare.com/upload/files/16649960860.pdfIn PDF document text
    • http://nova-auto.com/upload/gudemibovamewirijex.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_off0000e421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE421 16744 bytes
SHA-256: fb3a6e562f52026ea9e6d1b75a875eee797559f87a0accff5fdb288aaba5fb78
font_01_sfnt_off00010fcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E2 10788 bytes
SHA-256: 67563071af13aacaf795c001649bdef22f699a61df8b23a2191e04e06d9aaae1

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