Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cee7ce4ca37f7ec…

MALICIOUS

PDF

83.4 KB Created: 2021-06-29 00:37:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 531a6d621374edc16e3fcd4f1d8c8922 SHA-1: ffa47c741d42fab85c4c7d43031b81ba053d93ca SHA-256: 7cee7ce4ca37f7ec55c0f6eb6c579d32580f11833ec1b2ecfebbba5db661e88b
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS uploads or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://goodwill.pl/userfiles/file/59938170294.pdf In PDF document text
    • http://huucodatlanh.com/userfiles/file/dubilixujufinegobepojat.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0ca829ecf---kujobofife.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/zepekedokixikewi.pdfIn PDF document text
    • https://epiphanych.com/images/file/muxawunugugolib.pdfIn PDF document text
    • http://diamond6ranch.com/userfiles/file/56632235533.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/2f1ec29fa1fd7d1a35e51dcad00a8cb7/111630407.pdfIn PDF document text
    • http://nena-artspace.com/ckfinder/userfiles/files/98710441804.pdfIn PDF document text
    • http://simmsfamilyreunion.com/clients/9/98/98d47f1658d09d39d77ba56043454c9c/File/69857162508.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075d1e778b7e---debaxunev.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a058324cd2d---rabujewikawugu.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607449bb2c662---jobifibaxexurumes.pdfIn PDF document text
    • http://ncabhsa.com/clients/875427/File/22959741085.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5511bd36c---tutipubuwuluponinogexaj.pdfIn PDF document text
    • http://mid-europe-ex.com/31991399410.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607d62fb4d582---89417750833.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160796aea6fb5d---17361706750.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210627065614.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/hm5qeq86o1f585a5aeivs9m1t2/28655273241.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/vugeterenev.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608212b75179f---21604005535.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e3e442035---zojilotonajanosulokugolo.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758a895b00e---44730613322.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac91e923ce---99552569824.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=exercises+on+addition+and+subtraction+of+fractionsPDF 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_off0000e44d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44D 16448 bytes
SHA-256: 6ef825a2b041fd373f62c64570a2338d5126e91dde232ca5f89394630bd0822c
font_01_sfnt_off00010f1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1B 10748 bytes
SHA-256: c301e377df12433fce5ac9f39379b9c6ff673fbdced89e9580df3c475c357cb9
font_02_sfnt_off000127fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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