Malicious PDF — malware analysis report

Static analysis result for SHA-256 78c15e76e14fdad5…

MALICIOUS

PDF

77.2 KB Created: 2021-09-01 04:00:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 091b2cee182d4642e538c0aa0fb757be SHA-1: 0670cc8f4bd7ee8dd0f49355954ed0600e129b52 SHA-256: 78c15e76e14fdad5e4c76cc0f1600eb5bde1c3ba23c1806fa352a7cce1ffd631
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external URLs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure and URL distribution indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crysiq.ru/uplcv?utm_term=pdf+to+word+format+converter+online+free PDF link annotation
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e96dc4ad5bc---rerotolasowibavokiv.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/kitipenorotubidu.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/jasova.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210607074331_6ryjmj.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/98973784216.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d06968dfaf---45520943980.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/39c3b0e81e119d1b4deec6a37e243647/58698013012.pdfIn PDF document text
    • http://tchid.net/userfiles/file/silufejiretuf.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/gexojufavonibew.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/26011698320.pdfIn PDF document text
    • http://lawrence-spruill.com/clients/42275/File/fejanukizoxikemisutu.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/0e926887945429ad6ca6137e1a4ac07b/vezakekegijozimifaj.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/9dl2um5bs2i0etsertt96p78c7/94661694207.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/23275676531.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/oserv3cfom81b2aogn9nkjmmgp/nemiminaz.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/sarabokutebole.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/7861685966.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/nefare.pdfIn PDF document text
    • http://citra.cl/userfiles/file/42111040801.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/tr9ugo1cpio7d7qlmq9uod11f3/57345394733.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608401e8c276c---xokawikuputiwuzazegusiter.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/58119749871.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/76195813274.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/5oleb8ui5knvb78u70et99l3s8/39516585514.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_off0000c75a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC75A 18408 bytes
SHA-256: b15bb6210dc6ed8fe69adcc455ef30d3996c03ed18262f404860aa93798fea7d
font_01_sfnt_off0000f667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF667 10620 bytes
SHA-256: 407e87600336156f23890a989d8f8135ad237a55bd00ea111e371c9bb8cbe218
font_02_sfnt_off00010eb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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