Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e7b6e8a5fb75083…

MALICIOUS

PDF

94.8 KB Created: 2021-07-06 06:44:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 768369763815420482859d4b201c9b0f SHA-1: 2163f85bb72eaa16f4c64f5f26df26c075313742 SHA-256: 9e7b6e8a5fb75083d5b59b0bbe12ead4226d6ecd8f1d2c7b3d57842db322e97a
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/ddl4la8ame6ibganvvl8rsmsb4/nulowelanofura.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/bvfv7cfsj0pnjnq09ima7u4e20/koxamigavowon.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16073528212024---maleranu.pdf
    • http://moristas.com/userfiles/files/69244053432.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/2c69d942f4a0e3702a12224cced228e1/jafod.pdf
    • http://macap.nl/app/webroot/files/userfiles/files/20872566663.pdf
    • http://olsztyntransportmedyczny.pl/userfiles/file/13351375880.pdf
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/26bb9b0b26ebe52ba852b5ce7a2ab56d/83534504887.pdf
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/9068c2e3ed2445a9982fd0bd76d8e50e/13184566987.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bdef0a54352---48951775737.pdf
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/80d5947dd739a8186bb46da31c89bc88/33839606596.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4cc358fc6---46865582047.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/n1mtkscvi18k9g6bgo7gp30n3v/mowomaxarukuleralonezitog.pdf
    • https://afayl.com/userfiles/file/nalaluxoxetuxovitokinut.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a47eddc44ef---bimakosowazate.pdf
    • https://gachbinhduong.com/upload/file/70299626137.pdf
    • https://catwalkdogcome.com/editor_upload_image/file/vigaxotorakepononomobudi.pdf
    • https://paymentor.nl/uploads//file/xusogovugisenewoforobo.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab7a902aeb---wifexinuravolasagobuzewo.pdf
    • http://helderlive.nl/ckfinder/userfiles/files/rebitevise.pdf
    • https://1877painters.com/FCKeditor/file/welopunevuniwivakukov.pdf
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c17c36cd90---tiroruvenusebebadi.pdf
    • http://x-site.by/upload/editor/files/66971085217.pdf
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/26047266138fea8db34978dde5e21d1a/difuvizepulota.pdf
    • https://alihuata.com/userfiles/file/22391043967.pdf
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076108f5b73c---86052097852.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/87db998cc1561ac6bdb335639da17016/bipakegowukesilowelopon.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=heel+pain+and+numbness
    • 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_off00010bbd.bin
b0e7d8d6c2936177b9c2bec1243b9a9262ed0bedfcf05f4b41344c993d9be0c4
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBD 19844 bytes
font_01_sfnt_off00013e92.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E92 16792 bytes
font_02_sfnt_off000156a9.bin
eaa826977917f1f861e2a1c9b96813c056bc36089f4c8a92ab100656c6b414e7
pdf-font-stream PDF embedded font (sfnt) at offset 0x156A9 10468 bytes