Malicious PDF — malware analysis report

Static analysis result for SHA-256 e45ee8fcc46bb30c…

MALICIOUS

PDF

85.3 KB Created: 2021-09-09 15:22:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 557663e5b6e8b924c0a842daaeff4224 SHA-1: 6320b255ce5d2f58c9484311216798031a161a85 SHA-256: e45ee8fcc46bb30c963cba751be2fa4968dc92a943b7ea6a06b3afec0a3deea5
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites and disposable hosting, likely to distribute further malicious content or phish for information. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://donghotam.com/luutru/files/ledewazo.pdf In PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eea8106568---84632856644.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/16898161082.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16130232fdbea3---wikedetevasunupado.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/66662318811.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd3567e1ad---83514441431.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/duwozafikafebotalof.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/54404918496.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/gobesiku.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/felotep.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/dubalokosinoxurewib.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/wijidowu.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/5745978484.pdfIn PDF document text
    • http://photopuzzle.net/userData/board/file/45756115270.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/guloriwupuvebumez.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/tgvh8nu8dpc4p2tsp0ph2hkrcm/55243262130.pdfIn PDF document text
    • http://yejiya.com/userfiles/file/89822718306.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f606b24ca---vataresitaro.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/tufenatib.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/42067852992.pdfIn PDF document text
    • https://amzentransportationindustries.com/admin/imagetemp1/file/9071874185.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/161301c149fd95---megawudumokuwet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=serial+key+office+365+windows+10PDF 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_off0000e534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE534 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4B 11388 bytes
SHA-256: 6f5bec117b2632fa9f3fbb84632f4d4ddd86a2a14939ff4538255dfff30a3529
font_02_sfnt_off00011855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11855 18036 bytes
SHA-256: fa26054bf22a73ab4cc7d0ba05d68305657a73893aac791d502c810d82220ecf

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