Malicious PDF — malware analysis report

Static analysis result for SHA-256 443ba76797331b49…

MALICIOUS

PDF

83.4 KB Created: 2021-06-25 13:27:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 30817fcaa21b9d32a825aa8ade76381c SHA-1: 80cb3e0579a7f3e6b80d3dc9f0849601e72cd6c4 SHA-256: 443ba76797331b49ccb20b800d9eddae21f7191d79b7b8b1582e4bfb5f9a7791
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage, suggesting it is used to distribute malicious content or redirect users. The presence of numerous unknown URLs further supports its role in a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722e80b197d---88247415002.pdf
    • https://myphambambi.com/webroot/img/files/kosotiwifenobaze.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/390fdebb96696eb65bf2bf49965b8b44/52808365765.pdf
    • http://asahiru-ban.com/files/files/nelorajajozubu.pdf
    • http://linkingpeople.info/userfiles/file/47332154467.pdf
    • https://muratay.nl/userfiles/file/16732231111.pdf
    • https://csodamalom.hu/files/files/losanuxixibuvil.pdf
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/isnadufjdb1gdm44rgrpuml0k4/zanivakibavu.pdf
    • http://hcvitamin.com/webroot/img/files/subad.pdf
    • https://soechi.net/userfiles/file/movewux.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/mnlh7j512c0j722gqvj083h3l7/daxuzikesepis.pdf
    • https://menlopark.com/wysiwygfiles/file/4536095505.pdf
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210619103339.pdf
    • https://demircanticaret.com/userfiles/file/3726581957.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=deepest+condolences+to+the+family
    • 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_off0000e210.bin
6645f5d6f13b493d171cb34df696130f0f3297f16548456488b52d43290adc50		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE210 17456 bytes
font_01_sfnt_off00010fc8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC8 16792 bytes
font_02_sfnt_off000127df.bin
9f2ff596db2beb256639147d03d4c679737511572c74e283a977aaf5d5540309		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127DF 10900 bytes

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