Malicious PDF — malware analysis report

Static analysis result for SHA-256 b22d44871ff2d4da…

MALICIOUS

PDF

85.0 KB Created: 2021-09-02 04:19:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d6456894eb7cffbda81797d3e4a37576 SHA-1: 028ff9ef31415ec5892b49ea57ff3560b26bb446 SHA-256: b22d44871ff2d4da0775940304bb86b6f45841ea9c04f68eb4bf98dfba090a71
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous external URLs, several of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple compromised host links suggests a tactic to evade detection and leverage trusted but compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://ropaalmayoreo.com/images/userfiles/file/jepejonu.pdf In PDF document text
    • http://klpa.net/userData/board/file/82038388711.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/pededekiwukopemixi.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/nibomimubuzojetuk.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/87523210371.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/d69bee4413590fcf9d0addc6f36a8897/39427937071.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/41413161627.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7bc3c7b950---zoxizuvivonedes.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/sipasarilazaviket.pdfIn PDF document text
    • https://mayersoffice.com/userfiles/file/98710822789.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/gexix.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/52667270124.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/sewoxafami.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/288c12fcd1c776d37dbc88eca0b5b9ec/kujijudetitebemugijeto.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd393f3273---zosiwumalorukug.pdfIn PDF document text
    • https://trieurodata.ro/images/file/jinufa.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/9688150836.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/neretafikabumametemoxuz.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/0f383879306ec23d67f4ce18da67b6d6/52827579552.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/79905906019.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/66783725289.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/vowev.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5372587cf---kakazajeratozobor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=what+do+i+need+to+study+to+become+a+psychologistPDF 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_off0000e60e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE20 17528 bytes
SHA-256: a9195f59e7b8c9cc880763b491113aa7621112f70545e95f0649adce51a1ca62
font_02_sfnt_off00012bc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC8 11208 bytes
SHA-256: 79abcf7f04b10c72a406feafa55de96936a07756da309e70d7aa478fe927d15f

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