Malicious PDF — malware analysis report

Static analysis result for SHA-256 589cf7f53f8deabe…

MALICIOUS

PDF

88.3 KB Created: 2021-07-17 11:29:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 139a30a738dcd30228ceb8a5b858233b SHA-1: 9b7f72bf7e8e008d22a9f398326cd23a80e6151a SHA-256: 589cf7f53f8deabea5dcf756617ca6d8f5624e8b345c7a4bd6cc7a22d1a1e359
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload storage, likely to obscure the final destination and evade detection. The primary goal appears to be redirecting users to malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/29397419ccc75aa420b32b32ed1cf76f/xapub.pdf In PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/3c28b548e6521c4d6f57c535d5e291bc/filitafil.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a992541d1ed---33989033854.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/42947757247.pdfIn PDF document text
    • https://familienarbeit3plus.ch/userfiles/files/bijetur.pdfIn PDF document text
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075769073fb5---43282895293.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/nufokepega.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-6///202168054295966.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/47185244180.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/kikuf.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/2mblncosa7o9i4quhqo2lrnkl1/lupejotedatumakoka.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb1666f0ab---palasedati.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/vepolutapuluzazukafata.pdfIn PDF document text
    • http://rchs1964.com/clients/5/58/580abc73d3aac4ea3a2bdd7c75327783/File/34524077433.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4ad808d9e---paxikafasawetituk.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210502155340.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/setupojutaxotowo.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/jetubezu.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/lizevonasez.pdfIn PDF document text
    • http://mousike.it/img_ins/files/jarigokajuzajari.pdfIn PDF document text
    • http://yorkiematch.com/clients/6/65/653dc45b8f6063886304ac4260dbb99c/File/rorovuropiw.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/07/13/12087106124.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/26886540799.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=one+dimensional+close+packingPDF 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_off0000f19a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19A 19196 bytes
SHA-256: b350077544efb44dc46ab42c3b2e8d31579443a2e09b2116dca591d02d433db7
font_01_sfnt_off00012325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12325 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B3C 10776 bytes
SHA-256: 6ac0e1f7b43d4c04eccfc28578d92ce7377efcac9830fdabb31afbdcfb43ba68

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