Malicious PDF — malware analysis report

Static analysis result for SHA-256 377ee4e15768f088…

MALICIOUS

PDF

84.6 KB Created: 2021-07-29 21:10:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f4d3b6a628303417aec81195737ff3f1 SHA-1: ffed951a07c9ef1e321baa5cb76bd04da6a4532d SHA-256: 377ee4e15768f08860e7b91310de8d4bde76ff81f7fb4efedff50537c70ee1c9
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. The heuristics reveal that the document functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely serve as a lure to direct users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/mgak3jkug51ul7bau2kb8976cm/kivamipokov.pdf
    • http://nutrisoilvietnam.com/upload/files/mogexeromexax.pdf
    • http://sentezetutmerkezi.com/upload/ckfinder/files/sovedaxogafe.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098f6ec43a5f---xovopuzufete.pdf
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/39179658062.pdf
    • https://pasarangroup2.com/contents//files/3206770075.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080e9c7d2252---70291234397.pdf
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/2d6d7f13a29fe985c8db0d456003587a/31128628748.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071969d01636---88282681016.pdf
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/d0f5719a703c015dd624f32c1a6b2bf3/betekuzebesozusozuxo.pdf
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fff4ba7320---17777034406.pdf
    • http://fzsvybbs.at/userfiles/file/nasawemutasidobufosudekiz.pdf
    • http://sukhabalka.com/files/file/dupofit.pdf
    • https://zifu-tech.com/app/webroot/userfiles/files/54627564995.pdf
    • http://poltinik.ru/userfiles/file/majeve.pdf
    • http://dent-pro.cz/pic/file/lekug.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/ug4fdlt6epvfq304rqqc32ffv4/71548905602.pdf
    • http://firanywiktoria.pl/uploads/editor/file/dofowuvogopo.pdf
    • http://tasarimak.com/ckfinder/userfiles/files/levepatenatekafexomese.pdf
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/mezumite.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/a260a9a5636d271aa471b737b43e9e5d/31030394393.pdf
    • https://hanul-muresenilor.com/wp-content/plugins/super-forms/uploads/php/files/9i2ib01t4eodioore0shl00qtp/67973204220.pdf
    • https://palcev.ru/userfiles/file/62249460363.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+use+an+abbe+refractometer
    • 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_off0000e3b8.bin
f803f74240dd31271344ab8ed0d76e4901ec99edd4f465b63142723cad0dde01
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B8 18256 bytes
font_01_sfnt_off00011382.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11382 16792 bytes
font_02_sfnt_off00012b99.bin
983116e522ee6cb4d0a7f932d867f8d041b9ef1fa4a65e1157291b6698934f5d
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B99 10676 bytes