Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8ac231a7c75ad40…

MALICIOUS

PDF

103.7 KB Created: 2021-06-26 08:29:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cbddfd62fec73a4d1280acdc558b1889 SHA-1: 4aeef2447fa9ba915ef8321614296a5faf79556e SHA-256: d8ac231a7c75ad4014865191d4be76c608b07193c2c046b121c3aea3fe11a5b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, likely to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a vehicle for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=friction+losses+in+pipes+formula
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160755b4698969---92745794076.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160819408e5c53---84553014261.pdf
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/4650f4eba0d8a0a96cf59ba2a979eb6e/24001717587.pdf
    • https://dudikom.pl/userfiles/file/37914187790.pdf
    • http://beastyenergy.com/userfiles/file/92607372560.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/2fe75da9891a8e47e621d3002b0027d4/63273985096.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abb576c09ef---56524654734.pdf
    • https://rpdev.org/ckfinder/userfiles/files/vemunakepoge.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6f7410875c---xuvufukinu.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160793ae43ce27---45944461806.pdf
    • http://mariamozharova.ru/uploads/files/rodifapuv.pdf
    • http://augustaelectricalwork.com/editorData/file/fevoxaxoloxogefekevo.pdf
    • http://morethancars.nl/uploads/edytor/file/90377851691.pdf
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/89a534i1s1ssns85ccbh7vheq1/3291409940.pdf
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/081656eb63cce00a44f5b4f162336afe/96457833379.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a88b0343df---74716538058.pdf
    • http://kimandyoo.com/userfiles/file/pepifapobawa.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4a08c0117---24376165344.pdf
    • http://evolutionchonburi.com/userfiles/files/64281564048.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee99adc480---sugirakuxosikek.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/de5db8e585a3f50c164b311eba75e0d4/61353166531.pdf
    • https://bluetact.com/locktactyuma/userfiles/file/13953871985.pdf
    • http://www.sphotobooth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f305b246ae---texetisu.pdf
    • http://cnzgks.com/userfiles/file///gatizemirasaxefowifazu.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011425.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11425 16792 bytes
font_01_sfnt_off00012c36.bin
d4659a125c3cbe5a441e1656420a62069f289d6c6eb106e67215cd25a4b13b97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C36 16156 bytes
font_02_sfnt_off000141c9.bin
f5fb8c8ba82a3f2763f032fbf3eb70e39af758ea4879ce73cabe69a8a136bb1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x141C9 10716 bytes
font_03_sfnt_off00015a5b.bin
1637ff782f590b36c46d256585fa69e98c33eab32825f0af003b619b29ee0929		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15A5B 21120 bytes

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