Malicious PDF — malware analysis report

Static analysis result for SHA-256 194a97b698a8d565…

MALICIOUS

PDF

85.3 KB Created: 2021-09-05 17:13:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8aff91f5b016f6e41136a9eee594ca95 SHA-1: 74772ff452d9a2f89b3747d3dfba12a7db57f562 SHA-256: 194a97b698a8d56540d1e9127bba593b3e371fda7ff61a4146dcaabf8500239d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous URLs pointing to potentially compromised WordPress sites and other disposable hosting. These links likely serve as redirects to phishing pages or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://verlauf-ekb.ru/admin/ckfinder/userfiles/files/39657375523.pdf In PDF document text
    • http://bnblspecialities.com/userfiles/files/bepawomebifakezef.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/tevumaf.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/4690316437.pdfIn PDF document text
    • http://livingkaneohe.com/userimages/zukalilebadet.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/dixudawadexuforoded.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/369951b9d0479043be2cb3f0f333c610/raribojopiruvu.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/43473383398.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-6-9/20210609131745663953.pdfIn PDF document text
    • http://ud2-140.com/files/65351972602.pdfIn PDF document text
    • http://shelton1961.com/clients/35589/File/temerodamik.pdfIn PDF document text
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/7202908984.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/43049177147.pdfIn PDF document text
    • https://liftsystems.ro/LiftFiles/file/22599073752.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/65687219493.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/lolapebuzaxaxumudavififu.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/fdcefd64b7770ae33e7cb33b4ac1ff97/70152255676.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b25ca43c60f---tojadoxefujojat.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611027b90998e---notexojara.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6517324e49---rukixo.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7cb2235aa---mavetexelepobonol.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/b946b67a948be7592f2f61e59bddc7b5/93607942627.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cff6139eb27---97067882514.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=2014+ford+fusion+hybrid+se+owners+manualPDF 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_off0000e6ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EA 11236 bytes
SHA-256: 993aed50f525b280039af13ab14d338abb23c445cbb318b20fb704cf406ca1cc
font_01_sfnt_off0001011d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011D 17776 bytes
SHA-256: c3595bd24415688e674da6e3401c78250815342c81019838e05c2a49ddceaa01
font_02_sfnt_off00012fbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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