Malicious PDF — malware analysis report

Static analysis result for SHA-256 aef1484665f8cc1d…

MALICIOUS

PDF

89.2 KB Created: 2021-07-18 17:04:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1178f5940de8c7f8cffd597ee9da870b SHA-1: a8eda47c870ccdad039a5e4ec98861f68e396db2 SHA-256: aef1484665f8cc1d445e11d517090a4a94e1617aa2b36615d6b1b4aae689a77b
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains a link farm with numerous URLs, many pointing to compromised or disposable domains, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the nature of the link farm and the detection as a 'Pdf.Phishing.Trojan' indicate a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://almudenafernandez.co/ckfinder/userfiles/Files/33090880946.pdf In PDF document text
    • http://tubietelbar.hu/uploadfile/3047051794.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/6651716296.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/70566292751.pdfIn PDF document text
    • https://suksesunited.com/contents//files/63200551695.pdfIn PDF document text
    • https://mfdesign.hu/files/file/pujesituniwa.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/narirorojodukanaxijoko.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/a8eb15a4decd71bd2a24d64d8499e862/13869835429.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/0a4eb197d2288cf8e36aab7fc6020198/19171921742.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad3105ab78---vilodirajujitobopinulus.pdfIn PDF document text
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/0p8vulolcml5dn4tdlvb21sdvl/nuzusuvalesuz.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a804a46b4da---58135268976.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/80ef4a358m4tfjnss4l0d4httl/fuwegavarenibeleka.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/38730135861.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/ead9d23238640300c9ee1d71bd932ba4/nusarezewukiwakutafopabu.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/e4a72a067e712905e6bbf943456237d3/mozemaka.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607a51bade455---79144825171.pdfIn PDF document text
    • http://scro.ru/pic/file/89300529022.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/vopebib.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8140c6390---kuxurejopomawosezufep.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160829c8cc1475---3315876939.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/99610197400.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bed357a779d---5707709514.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=happy+holidays+picturePDF 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_off0000fc96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC96 10712 bytes
SHA-256: 712de71e3219d5d8f0a6d92794a22253c5d5b0c1a4478cf67788919b0be57ca8
font_01_sfnt_off00011551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11551 16584 bytes
SHA-256: 3de4ce2eb9b39dca23ef3a48c0757d2ca43982729e1df6547cc3308ea5164a71
font_02_sfnt_off00013feb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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