Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcc632b1ed2b98ae…

MALICIOUS

PDF

73.9 KB Created: 2021-09-18 15:01:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: add646f5c0ff8cb4f152fb0313439853 SHA-1: 1a1acd240e669a64fd73bee54e8ef3b2f152af5f SHA-256: dcc632b1ed2b98aef37cf0d4da588c22e7b0b4849a66e419e7ecd8a90fbece0d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised WordPress sites, suggesting it functions as a link farm. The presence of 'utm_term' parameters and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate a phishing or malware distribution intent. While no scripts were explicitly extracted, the nature of the links and the ML classification point towards malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://garglob.ru/uplcv?utm_term=gold+instagram+apk PDF link annotation
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/828a4bbaf346b5df779fcb566ed0e6a1/totajatokul.pdfIn PDF document text
    • https://beldapin.com/calisma2/files/uploads/bawudimezijaxad.pdfIn PDF document text
    • http://lemma-studio.pl/userfiles/file/69713725317.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/52400342054.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-5/20210905081756426720.pdfIn PDF document text
    • http://ore-processing.ru/d/files/magiwupapazoxexifud.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/28606114552.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/5308424548.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/8241245647.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/84901372522.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/83799110185.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16141629c80b50---59166690421.pdfIn PDF document text
    • http://expertworker.paraleumarian.ro/app/webroot/files/userfiles/files/pidexewikejebalumetadiz.pdfIn PDF document text
    • http://vers-ma.de/userfiles/file/sugurerefopalixafu.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/ls3f8o8l7ltqr9vprmn22a8dg5/lojolupule.pdfIn PDF document text
    • https://rtquery.reitoken.org/Coaching123/images/files/mebakuwezoramufo.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/30655675055.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16141667f6f3a9---jarovedarefi.pdfIn PDF document text
    • https://vitanov.rs/files/53433754293.pdfIn PDF document text
    • http://kvrhousing.com/uploads/99380693067.pdfIn PDF document text
    • https://infosantiere.ro/userfiles/file/voxanevav.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/mnkdi6tgjr7p7fr9tap3pqt0q6/relupujudoposisavirog.pdfIn PDF document text
    • https://bacsionline.net/userfiles/file/soleboji.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_off0000ba5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD272 10736 bytes
SHA-256: 4ece179a600e53996a320a0d68c94c71fe4a6291ea0cf0703076cb334ece19cd
font_02_sfnt_off0000eadd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADD 18904 bytes
SHA-256: 8651cac58fe6956df23ea3fb0921d0900b19cfc262c36a143c3adfacb60c495f