Malicious PDF — malware analysis report

Static analysis result for SHA-256 50e8ee29e7de80a7…

MALICIOUS

PDF

89.8 KB Created: 2021-09-01 03:25:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fef2ebd6e174dbc2b38ca0e057690748 SHA-1: e5b32447e7b3ff6e06355f40d369a2b3c49cc6f6 SHA-256: 50e8ee29e7de80a7de07b7914cfbe597f44c1e3bc8d7e1de88d7ec48a1bb779c
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other domains, likely intended to lure users to malicious content. The PDF structure itself does not contain executable content, but the embedded links are the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://equator-maritime.com/userfiles/file/nulatatikelawiba.pdf In PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e9fb10ce2---64148262231.pdfIn PDF document text
    • http://vita24h.com/uploads/userfiles/file/dekupod.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/rimigarewixonukonekadobe.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/6710469934.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/46406250417.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/67975066104.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/39279592929.pdfIn PDF document text
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/f9f59a2fb110bfc30b303dc1bfa71e5c/23364871842.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/036c29a7b3be33fc4159f722d65d3709/10662557686.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/e94b95f413728a3c78ce71d10dc20f3b/66510900429.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/d56987e49c339dea196dfc6947f7d0fb/kezivorulilame.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/7d4333498033904cd962bb08bd45251c/66636372936.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/6a6bfd0aed5332385f8c4a0adf27799d/68853468166.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/48651408928.pdfIn PDF document text
    • https://tomas-music.com/contents//files/63922970690.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/70427841451.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/gobugokixeziladorapafo.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/45136136706.pdfIn PDF document text
    • http://hoangminhceramics.com/app/webroot/uploads/files/folurofudexufuju.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160be8d8004edf---82814038955.pdfIn PDF document text
    • https://vespaclubcagliari.com/userfiles/file/21022328378.pdfIn PDF document text
    • http://connectcontrol.net/files/userfiles/files/pasewifumezakijefik.pdfIn PDF document text
    • https://fl-forever.com/upfiles/editor/files/14395182625.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/18715118071.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=the+watch+series+toPDF link annotation
    • 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_off0000f8fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FD 19232 bytes
SHA-256: 085904175feb7090132b1ca0df557c15e72328a28b670e40efb07497835a4980
font_01_sfnt_off00012a06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A06 10224 bytes
SHA-256: 4354a649fa45a3d500f2e0f5d778d09f70f7738395ff759b503ff0d81b8061bc
font_02_sfnt_off00014140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14140 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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