Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffdb16c68c8df332…

MALICIOUS

PDF

87.6 KB Created: 2021-06-30 03:02:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6cf55cd4f2e6beaa9ff3485836f97eb3 SHA-1: 07df965ffe284e889bc17d63ed7572a75f9e777b SHA-256: ffdb16c68c8df332f2ef07a3968069c0f9e4577d079b284eeb19a490e0ccea5a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, likely intended to redirect users to malicious content. The presence of external URI heuristics and link farm detection strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://coretry.ru/uplcv?utm_term=how+to+filter+messages+in+messenger
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c92be458c5---taninewobelixumi.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c778bcd07c---81033093844.pdf
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/d580fd40657685ddb39ed4477f49ab62/waduxepatizonazelofivesej.pdf
    • http://begemot-rus.com/uploadfiles/file/2021051519192673499.pdf
    • https://voyagerf.ru/wp-content/plugins/super-forms/uploads/php/files/7b9c8ec68170c04072d4338aef158ca3/gaputugamidegumuru.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2b66edb86d---89108703138.pdf
    • http://erdbau-rauch.at/vanogemevarabozemutabete.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/e8b7dbf422d7893cf6385a94f7485024/91186527751.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d52243913d8---kevasexunozuxubufafegis.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/juov8npme31f42t62haogkmqbi/bisalegipimovino.pdf
    • http://hnkingdee.cn/Files/file/202165165611.pdf
    • http://www.europesolidaire.eu/userfiles/files/bupezagafavarezub.pdf
    • https://begili.com/uploads/image/files/75452522884.pdf
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/gufefojava.pdf
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/uihignbtqib971otpema36674d/56405556530.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608144122c8d7---69815729658.pdf
    • http://anhuicrew.com/upload_fck/file/2021-5-12/20210512030158198508.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a72520d4cd---nixajodalodagag.pdf
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/f48ibmua9mi2nnvq3mkq7cbef6/fudumela.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/be3ousrrhngsv92bja7rie100s/56286171690.pdf
    • http://ahsaipu.com/v15/Upload/file/2021430648267319.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f90f4b3a4---tureni.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f487.bin
a41f482fd3b978f8e69cf86f550534d16ac47eb58169d1e13c221b9cba0d2f53
pdf-font-stream PDF embedded font (sfnt) at offset 0xF487 10636 bytes
font_01_sfnt_off00010ce2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE2 16792 bytes
font_02_sfnt_off000124f4.bin
93163eeb4d7a8fa41de5660cc654306d8c2a4a6ec8d54f4459c6f49a8f0552c1
pdf-font-stream PDF embedded font (sfnt) at offset 0x124F4 17260 bytes