Malicious PDF — malware analysis report

Static analysis result for SHA-256 964d6b4c24733d37…

MALICIOUS

PDF

75.0 KB Created: 2021-09-15 11:56:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 23622ed99942d7bf8d47c8bb46146417 SHA-1: 274124f7c982ba4bc4254a15d0a0d7b14ae5d12a SHA-256: 964d6b4c24733d37251b23c4f32eda37301e61409774c0b4ac0928dd07a06a6b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to redirect users. The presence of these links and the overall structure indicate an attempt to direct users to malicious external content, consistent with phishing or malware delivery tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cylinder96.ru/admin/ckfinder/userfiles/files/rovedaz.pdf In PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/59538891690.pdfIn PDF document text
    • http://e-sportis.com/images/upload/2883120505.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff9c65d07f---tokoxiker.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/jiwakejaf.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613baf1ddd57e---bigumapedejevafipe.pdfIn PDF document text
    • http://perseverance.cyou/updatefiles/file/5192921440.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/40433665150.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ea0435b61---gowokenad.pdfIn PDF document text
    • http://yourhandmadeitems.com/userfiles/file/86317051848.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/rivijaluxirogenes.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/nebade.pdfIn PDF document text
    • http://smelawservice.com/file_media/file_image/file/pesisekizidasukamunazipel.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/631d1464d04396dc7baa33177005a996/3853262061.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/79198207501.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130412c42f88---13518396509.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/solonibudogakosizuz.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5bd4bd653---37658955564.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/panexuzoxowomanun.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/sotupelelipawipigimozisu.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/sakinat.pdfIn PDF document text
    • http://leadingedgecorporate.com/user_images/file/69132549626.pdfIn PDF document text
    • http://brbud.pl/userfiles/file/butaforotidivofabi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=cpu+overclock+apk+no+rootPDF 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_off0000c253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC253 10396 bytes
SHA-256: 671b2545c1f688025068c0d1d9ba73bd0d8f0d8a62dd65ec594659a83235d3ff
font_01_sfnt_off0000da06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA06 17108 bytes
SHA-256: aab7741b1f1b259a69da75c2a87ff315d2af10e4e5f4233ad975f0039fe14ee7
font_02_sfnt_off000106bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1