Malicious PDF — malware analysis report

Static analysis result for SHA-256 d58ec4ccbb722a46…

MALICIOUS

PDF

83.6 KB Created: 2021-09-07 11:17:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 15a90616088838573b22086e1b3e4889 SHA-1: 4cb2e563f9d8018779fe031fa8992841f855c626 SHA-256: d58ec4ccbb722a46eff1b51d95ac592559485eb4d90a12435858c3d436b3ffed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains a link farm directing users to multiple compromised WordPress upload directories and other disposable hosting sites, indicating a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users into downloading further malicious content or visiting phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://npi-management.com/ressource/site-image/files/33813378237.pdf In PDF document text
    • https://ev-owners.jp/userfiles//files/zedikupuwopidufike.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/94533492063.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/49034023436.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/doe3t1pbfj2n8jpikamecjakqe/lozer.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703a54a6818---18517310065.pdfIn PDF document text
    • http://vce34.ru/attachments/file/zusijerozef.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/1a6854706b251b136712ec88f15bdf00/tiniwugav.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/161169da24fdc8---47429129291.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/ximawekagofalanipunumukun.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3203a91cd---bulozesitigajorawoxem.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/25235436142.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/sekof.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/vozuluve.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/99ec2977a1462ab8291b20080d160984/79679075679.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d55826af26---2195498970.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609cef45a76ab---59498285141.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e9e8d4ea9dc50803b5ba2ae5cdf09977/35235396393.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/rizimoxisa.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/91df08133e192951e9d28d3ea58c2f39/ximanubaxavuxasawu.pdfIn PDF document text
    • https://zakarpattya-tour.com/upload/jiguka.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/tukolegejifijewazinibe.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160a22a6c60d5d---denapenupomudage.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20210826083452.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=javascript+print+pdf+documentPDF 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_off0000e15d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15D 17764 bytes
SHA-256: 2c955ee9230ae93d1093a53f9a8ca754ba775cc384611011011d06c72218e1a3
font_01_sfnt_off00010f29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12740 10892 bytes
SHA-256: 3af5c35d9fdaf924680710de07244e89130f5f3d006749700445f9428f922526