Malicious PDF — malware analysis report

Static analysis result for SHA-256 baa5c7df228a5886…

MALICIOUS

PDF

85.5 KB Created: 2021-09-22 18:53:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 67e8ee6fce4a4ed841d8704f44181cdd SHA-1: 50cdce04b7777498cc5cd7af6888164a14779490 SHA-256: baa5c7df228a588624c725047befa0830c463a5e3b87a55e9b0805659cb231a2
196 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or scam lure. The 'SE_CLICKFIX' heuristic indicates the document likely contains social engineering to prompt the user to execute a command, further supporting a malicious attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://catamma.ru/uplcv?utm_term=download+minecraft+online+for+android PDF link annotation
    • http://progfin.pl/userfiles/file/zafatukegixilajinudamiwit.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/rirodotol.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210904033631871.pdfIn PDF document text
    • https://lesrimaudieres.com/images/uploads/file/perovojavogururakif.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16142c320e739e---guvilatutami.pdfIn PDF document text
    • http://artattack-concerts.de/files/file/dewakunonubokodovomapiruv.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1fe1db08b---fudogifogimemilanine.pdfIn PDF document text
    • http://amunt.madteam.net/ckfinder/userfiles/files/sirozagexotufukiv.pdfIn PDF document text
    • http://addon-colsman.somantec.net/ckfinder/userfiles/files/ruvuvuneritawobet.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/kijuxuzoretebezumajotez.pdfIn PDF document text
    • http://naviway.su/upload/files/gomasi.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef38d36f08---78055029336.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/lajurelazagevunepov.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/85451149627.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16140c7317b715---biruxodijilixijirob.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/zuroranofefofozegukidiz.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/36773380294.pdfIn PDF document text
    • http://belstroyiz.ru/img/file/95654043648.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-21/20210921034548732864.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/jejefivugi.pdfIn PDF document text
    • https://peusch.lu/userfiles/files/60717026666.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/99897458507.pdfIn PDF document text
    • http://tranindo.com/Uploads/userfiles/files/tokujukubap.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_off0000e8ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AD 18500 bytes
SHA-256: be85265762fb3cda04f67330433d16224a65f86e8707af4cc30400f7dae862a9
font_01_sfnt_off0001183e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13055 10556 bytes
SHA-256: 69d61c88b5cf0b1809a859bbc616461f960eeaa9fe7120a689e5c7ce38613b0f

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