Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f6f82560ec3385b…

MALICIOUS

PDF

88.4 KB Created: 2021-06-28 14:57:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 29c3fb88d2c32ae324d8f8c601c0b52c SHA-1: ee77532b012c4c1f6aa2935e971ac7758f9e2cbe SHA-256: 8f6f82560ec3385b652cbf5bed295cde52ece96f4ca57787976356dfa666bf08
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous compromised WordPress sites and other disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to exploit vulnerabilities or trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://cructi.ru/uplcv?utm_term=example+of+offense PDF link annotation
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e2fcb5bc8---55318424446.pdfIn PDF document text
    • http://prmakeup.com/Image/files/8420377740.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/0d9558a357a3b75d7614b9827b8a9971/23414855365.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/78447229440.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/e40f747ea5c24bfab94fb948f885555f/fubizikef.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/sevuf.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/897d238a12504aaeae2008a45c61d33e/biwab.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/48712bbcb161fe84ac7821ec86f35c05/mijazotosowozaj.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/88180280331.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/lafobunu.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/joweko.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/ac77886bbcd298cb4e691e4553edfb78/kobuzijobotawenoposi.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce53835226---35529337791.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b75668855f0---wulisirozelo.pdfIn PDF document text
    • https://khanikango.in/file/dewanovunaruga.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf9e3a03ad---23060887419.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/poletetegan.pdfIn PDF document text
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/75befc1e756b25b84845b910ec93cb74/gugolisofumiwuxiwosupazev.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/zefekis.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/tanepazuwedogix.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/3c646b13a8e9976da352d7c1efc84a77/jakinadilisagafewop.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/a25c2e3b9dc92ff5164b97aa1d7ace4d/bawusibom.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/79384593194.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/46333921277.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/b05ef481f439e0ce4fda55a421d58adc/sodobejemi.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/78463170195.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF866 10312 bytes
SHA-256: 4787a7c18e04088696e9b446241995dafb5135304b2a146b6ad089d27f1dd9bb
font_01_sfnt_off00010fa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B9 17384 bytes
SHA-256: 74a9d617baa9355c70d1ee03c377dea74ff18a83cb8b5375787201f49c9ce467

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