Malicious PDF — malware analysis report

Static analysis result for SHA-256 79a5ae4355feaaf7…

MALICIOUS

PDF

72.5 KB Created: 2021-09-26 22:07:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0ce7929d952aa750cbe5e2c6f3a526da SHA-1: f6741eb31a8549c9b08a3465212cc5a92c401f6a SHA-256: 79a5ae4355feaaf79c50d6d850f464d2a2e23f6094747742378d5928f1f9854d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised CMS uploads or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://garglob.ru/uplcv?utm_term=private+vpn+download+apk PDF link annotation
    • https://soi.icami.mx/ckfinder/userfiles/files/88241848397.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/54600703930.pdfIn PDF document text
    • https://n-vv.dk/userfiles/file/56929324261.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/loxanejiwa.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/jakexukegegiririsimenomo.pdfIn PDF document text
    • http://bilcafe.it/userfiles/file/nisulowip.pdfIn PDF document text
    • https://equinox-e.com/upload/UserFiles/file/subeguxali.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/b1b33b7384243b298c5732c751233e6a/vojar.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user//file/_0602777001630686047.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/xajawejufixukosad.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/jemokewakevesimufubano.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/0u4gamgti01rsju3flojn092ne/rurisuwuf.pdfIn PDF document text
    • https://khmernative-rice.com/userfiles/file/fesataruv.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/77af3c868fb9f7c8eb981bc7e8c8462f/83179514821.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/zofeludoj.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/8195833498.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/junivirovufevetivovoledar.pdfIn PDF document text
    • https://superpart.com/files/jedunuravolakuzabojitumip.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-09-04/images/files/33678689375.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/448249bad6f66ec3ccd16b15ddb00892/tafefobigumexete.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/mokafuporoxuf.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d95a47c8c---83377771858.pdfIn PDF document text
    • https://jingchengs.com/jingchengs/ckfinder/files/20210905163450.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d688491027---woxalodemogubu.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/23614557622.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_off0000b90e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB90E 16952 bytes
SHA-256: 7135b0629a380269a8f683c99ca33145526d6bfc294402db39822bbdc2a2e1f2
font_01_sfnt_off0000e463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE463 10464 bytes
SHA-256: 959d3a1961fedc64bb0c2f0d0c7cfcacc6b68398b540d2d2b87f252bb93e7d03
font_02_sfnt_off0000fc45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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