Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcb074714f4849cb…

MALICIOUS

PDF

75.3 KB Created: 2021-08-09 16:48:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f9c43ce388715408b65f1e77a7c23835 SHA-1: e70f775a59f297385f19927b328656d541782654 SHA-256: bcb074714f4849cba58da596b6ad66d61d1b6177fd3c0a24e459865f77a98b8c
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs, many hosted on compromised CMS uploads or disposable domains, designed to redirect users to potentially malicious content. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or scamming attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ketchas.ru/uplcv?utm_term=how+does+low+dose+dexamethasone+suppression+test+work PDF link annotation
    • http://metalltechnik-kutschi.at/rawolekozinozuvim.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/88830983958.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/renopotogapopisabegu.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/d8531eb92b4065c8df5f85b7aeaee2ac/rorosifavuzekozi.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/tewap.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3232b1b549---99938655218.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/29782349316.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/fufewatagabarugilamepog.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/36915075073.pdfIn PDF document text
    • http://centrostudiapulia.it/files/files/favitomabakexoligibuf.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/jibozoripojegam.pdfIn PDF document text
    • http://wdnederland.nl/file/sudafigiwuxadu.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763e80c452d---85168282771.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/45408807713.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/xixif.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c6882df99---bejexirubesijojaju.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/7367762524.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/zevubeponoburevuz.pdfIn PDF document text
    • http://planbmedia.hu/files/42901764875.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/watub.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4116e80e0---38871411993.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/rg8hnpv3bkkf33ekfe3g949ql8/84536016452.pdfIn PDF document text
    • https://morabia.fi/images/file/dorovemafunemikamasidu.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/33462662559.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160af9259a4f95---sijifuse.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_off0000c369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC369 16408 bytes
SHA-256: 598c544bdd3334048567cda9781eb17db662f86c11e5622bd196fa40e751204d
font_01_sfnt_off0000edb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB0 11028 bytes
SHA-256: 43fc889ca8f751037976c9975ae35b151b87b7fc6151ad72610b6f66ee98975e
font_02_sfnt_off00010725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10725 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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