Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9922da11cbe8a6e…

MALICIOUS

PDF

79.0 KB Created: 2021-09-18 11:55:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0b6f1c2074aad5f3703398e97aaafab0 SHA-1: 96ee6ae3bd19e1c95ab485af9c737fa32cd80b61 SHA-256: c9922da11cbe8a6e967fec8fb1825c25292072ff3c35a9ade38035641c88e758
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a link farm hosted on compromised websites. The document contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm strategy. The presence of 'utm_term' in one of the URLs suggests an attempt to track user interactions, common in phishing or malicious redirection schemes. No scripts were extracted, but the overall structure and URL distribution indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://chcial.ru/uplcv?utm_term=most+unique+apps+for+android PDF link annotation
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/36068509568.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/92255866683.pdfIn PDF document text
    • http://xn----8sbfhu6ab4bqv.xn--p1ai/userfiles/file/49057706165.pdfIn PDF document text
    • https://springkasteelhuren.be/userfiles/file/36345433425.pdfIn PDF document text
    • http://ovecollection.com/royal/admin/images/products/file/78372161241.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a85738baa---1347358408.pdfIn PDF document text
    • http://astmasme.com/userData/board/file/32060582845.pdfIn PDF document text
    • https://topupdana.com/contents/files/gopapenegejupowagigetux.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139eaf4d5265---ribajevadozazevanob.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/novuvologalu.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/3d34bbf10d03b5244197acfb030297a1/86184417999.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/48866697306.pdfIn PDF document text
    • https://noventa.cz/media/files/file/puvizod.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/firelizi.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/tebukilusofaneratakufofef.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/615b28ceeb59eb64aadf61a83de3fe3a/dafovas.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16132827064537---28389517942.pdfIn PDF document text
    • http://lagerunda.it/public/upload/file/pelixepavawanemesepozevep.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/putokiwoxuvomeduzisitem.pdfIn PDF document text
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/35354040679.pdfIn PDF document text
    • https://autoskola-scp.com/files/48052668597.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210903_060445.pdfIn PDF document text
    • http://sibaco.ru/ckfinder/userfiles/files/99188367713.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/jutukowudidutaxezoxugox.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_off0000d37a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD37A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB91 10684 bytes
SHA-256: 3958441508d01859deeca90c86df2ae6a0c40c265bc73e512e9381379c3bc2bf
font_02_sfnt_off000103fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FD 16368 bytes
SHA-256: 2b9da051ffd215524d557c204a8f8db77ea1c2835cba7fda8bebd6f9900b0eec

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