Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f4322355f9e6f4f…

MALICIOUS

PDF

85.0 KB Created: 2021-06-27 00:45:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5faac87651f88a71e4f473166e63d89f SHA-1: 404d119fdba2f1592c3fb4b22ed6b015c74d1d27 SHA-256: 4f4322355f9e6f4fd5d86888af4453bd92065ed61e4c085b7d94a9a830175906
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs pointing to compromised WordPress sites, which in turn host other PDF files. This structure suggests a link farm designed to distribute malicious content, likely for phishing or malware delivery. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://huntic.ru/uplcv?utm_term=examples+of+borderline+personality+disorder
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc52f5bef5---potigalanilopuxojugoxi.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/7bafc88d08e0150a9bf1f60cba27f547/giragatixujivij.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/db761c0617546c061363023e27204ce6/lebijijasobe.pdf
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608c91df92534---71308891678.pdf
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/4ba066617a497f09496bae0571a8df2a/45204655001.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16073f07f0e737---kerigenisonosisusaf.pdf
    • http://bygreenpure.com/userfiles/file/68350106697.pdf
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/6f9d895c63ce9139aa91647011ac9758/bajimusuxevuzup.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607552670efae---zofurotosisejotif.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d67afc54158---pevezonovime.pdf
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160bc467073034---rusudiruvujebupinegire.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16075afa8b2f28---levarufonugodomav.pdf
    • http://limoride.net/gallery/file/tisigavesifufugid.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab05ddecf06---xomiwitanavixivedodewo.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/885fab26e3e53bae852a796ab0651432/xuliwexixitezuluzolaj.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b3888446b73---savonajiz.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/3fa10723eac5252503a172fda60b68c6/1701955880.pdf
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/35c056e54a272f99eba3c185891b91b4/fejesikulazewuserituwen.pdf
    • http://kasintorn.com/images/upload/files/sadet.pdf
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701f2993d6f---reruzejulevo.pdf
    • https://telenovella-bg.com/files/parawuminowibepituzijira.pdf
    • http://studiotecnicoarduini.eu/userfiles/files/18769100258.pdf
    • http://accessiblevehicleservices.com/userfiles/file/96276848401.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_off0000ea0a.bin
d568b4f606efa857fa9fca21f3942054af00fe594f531a8107bfdc672239f37d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0A 16672 bytes
font_01_sfnt_off00011570.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11570 16792 bytes
font_02_sfnt_off00012d87.bin
a8a78398142c3b3af161a16f62598d1baa0e569869983b22c763a375eddec274		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D87 10996 bytes

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