Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab2a33ddb4006c97…

MALICIOUS

PDF

87.0 KB Created: 2021-06-27 07:46:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b8d159a855a379fa1f8a72e887347478 SHA-1: 6d2ac77118f4ff3cd307b0d63ca938a124825321 SHA-256: ab2a33ddb4006c97858af387f9d65ed6d65e27b4ab634b6ffe5aafe83b89fec8
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The presence of multiple distinct hosts and the use of UTM parameters indicate an attempt to obscure the final destination and potentially track user engagement with the lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://nomylo.ru/uplcv?utm_term=chemistry+empirical+and+molecular+formula+worksheet+answers
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a0f369270---27221591717.pdf
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16093c9d012e98---93434678147.pdf
    • https://nepalimodelagency.com/userfiles/file/33765285063.pdf
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/113677286560d5bde52d855.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b20435d5219---97782951941.pdf
    • http://alphabodysupplements.com/newerac2c/userfiles/file/semibinoz.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b02414c451a---24468807240.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/tgr20fhp572jvfd5965s9k910e/88586049652.pdf
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/6383da802d4f84e6e05590a890c57cef/54040548325.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/636e34c905f0aa181d2f0c27177cf62a/dezogepowegejuwexafamow.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff2dd046f1---vobanezepakofejix.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f7902419e---jemukolojoweb.pdf
    • http://magyaringatlanadatbazis.hu/dev/_user/file/7349567798.pdf
    • http://clinicoral.com/img/userfiles/files/84094347632.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824c8d60e64---lomaditafanofif.pdf
    • http://akinmedical.com/uploads/file/77739727806.pdf
    • http://automozg.by/upload/editor/files/gagakudupudevuwiwurawaza.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa56825290---62221322337.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609435adaa8b3---74343568485.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9e2161f8c---pisaxuwekosezoxini.pdf
    • http://maekuangudomthara.com/ckfinder/userfiles/files/wiridexijupipuk.pdf
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c1edd072e---magetafol.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/o2v0vh7hkimrdjv6r35618mnlm/31350135063.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_off0000ed8b.bin
193a7bc8fcfbe83a6a58b8dde1ad6321f9f663ea44897e300234c989b5e9fd30		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED8B 17684 bytes
font_01_sfnt_off00011ba2.bin
79309e4ec6d7db47167109d829e643ba2f4368b460d6c67e6479fc695d3ca798		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA2 11308 bytes
font_02_sfnt_off00013622.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13622 16792 bytes

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