Malicious PDF — malware analysis report

Static analysis result for SHA-256 07c00027a4a1ee76…

MALICIOUS

PDF

86.3 KB Created: 2021-09-11 23:29:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4f9cf74bc00aa3f23110035333a162b1 SHA-1: e6756d1a53ca8dc2ccac1451151324f7261d5dd1 SHA-256: 07c00027a4a1ee763ce947f9ed3a1eaf2b687c51d0e2ec98116157b664076911
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Numerous heuristics indicate the document functions as a link farm, directing users to various external websites, some of which are hosted on compromised CMS upload storage. The embedded URLs suggest a tactic to attract users through search engine poisoning or by mimicking legitimate content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://huntic.ru/uplcv?utm_term=plague+inc+apk+pc PDF link annotation
    • http://dentish.ru/ckfinder/userfiles/files/zawaromijugulabazoxoweted.pdfIn PDF document text
    • https://areopag.ru/sites/default/files/uploads/96086922300.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/dumogozitu.pdfIn PDF document text
    • http://sedaciesupravy.sk/media/file/67801436092.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/46456179176.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/17173078085.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/18374311607.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/weramexuwozizalana.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/658926abfabd9248757a803717a06679/ladirusade.pdfIn PDF document text
    • https://interconformity.ro/images/file/baxoluke.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1613034b9b6b1a---78709767298.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/b233babd50bfac27fc361e8723803856/badalodekuxuwavizo.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/68330210939.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/zowawukadigepu.pdfIn PDF document text
    • https://tarsiman.ee/files/file/romugaromowogotezitoseg.pdfIn PDF document text
    • http://lngpetro.com/userfiles/file/26309517094.pdfIn PDF document text
    • http://www.farmaciabergua.com/userfiles/files/12724716227.pdfIn PDF document text
    • http://kelvista.lt/images/files/96243636690.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161357b9d7d2c7---25097779437.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/90856567628.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134af6b72e6c---46223433200.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/25490873208.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/792cc021add9e4578b1ae4ba44cb4e9b/19268569808.pdfIn PDF document text
    • http://majedalkarkhi.com/pics/file/65917027145.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_off0000eb3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3B 10256 bytes
SHA-256: ff712bd86067f1abd1bbd24612b1ba58d130f049d4276dfe8ff2d5a23ae50688
font_01_sfnt_off00010257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10257 18516 bytes
SHA-256: e63e1b5cb6b47c12419c4872ea38724a2364a2b7a42ded21652271d2fbb19df2
font_02_sfnt_off0001320a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1320A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1