Malicious PDF — malware analysis report

Static analysis result for SHA-256 a17af1434ea7bc16…

MALICIOUS

PDF

87.5 KB Created: 2021-09-06 08:51:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 2b61dc6ae9d01c72a0d526009eb706e5 SHA-1: 3052b82ce2304723cbf12a3fa7c5b7a1563a2d62 SHA-256: a17af1434ea7bc1643ec5a75e2c5a4f4c489abbb1eaa119699cd4aa17c17a7f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites, indicating a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious link farm designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://pixomot.ru/uplcv?utm_term=que+es+el+consumismo+pdf PDF link annotation
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/dav66nqp4oi2ao9sf41u68guij/gofajev.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a32c06e00cf---60083602253.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/87405495345.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/takowijujar.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/18447409684.pdfIn PDF document text
    • http://normel.org/files/upload/file/74181382737.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/774u5kpltmvm43j1lqv03j3gfj/ribuzufeja.pdfIn PDF document text
    • http://onestep-tokyo.com/userfiles/file/21189338968.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077557d7c9eb---tazojotenafudolaxenavo.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/nugususumetoz.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/pitizanojavexebawumepaban.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5bbfc4ddd8---85625791099.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8d1ee2115---piruzabofu.pdfIn PDF document text
    • http://ezstreetautosales.com/clients/876244/File/benikig.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/3963494258.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086f0f43c9bd---difogarof.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb97545f330---27674132620.pdfIn PDF document text
    • http://clinicaveterinariagoitese.it/userfiles/files/46581124894.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/83206348542.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/33746638822.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/77803217397.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/romupekubim.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/2145243884.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_off0000efbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBD 10580 bytes
SHA-256: a24d965cb3c9ed28439addceaae0516bc02f001db0e74521e3c532e82310b531
font_01_sfnt_off000107e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E5 19224 bytes
SHA-256: 6d3ee4387b46b3738864d3a9977d50f0b8660ea36573d478baf027dee9865f17
font_02_sfnt_off00013872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13872 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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