Malicious PDF — malware analysis report

Static analysis result for SHA-256 f31bce526bffe54a…

MALICIOUS

PDF

77.6 KB Created: 2021-06-29 04:10:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9fe292ff327a9b2cb8b641d16c0f7248 SHA-1: cb946a428ffea8eed20a125bd8c92b1d783e3012 SHA-256: f31bce526bffe54abf18da4cde65d7a51bc562b2cb2baaee4b6cd0a261acce2c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to obscure the true destination. The presence of a fake "Austrian Post tracking" link in the metadata and the ML classifier's high confidence score indicate a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://debcopharma.com/userfiles/file/10692391766.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/vewesoxoripepasa.pdf
    • https://eatorhours.org/e-bussiness/fckimages/file/46460117074.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c55d79ee461---lukezuriri.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/3e8fojglhhoqti2t4tr2j7ks3o/siganalasoxinanabojelo.pdf
    • http://burelomdo.com/ckfinder/userfiles/files/77646007170.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/4ad4661b85a87dbf2291e13567c4d30b/96236582784.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd427aa760---81192842873.pdf
    • http://stellarp.com/userfiles/files/loledudurasetedodufi.pdf
    • https://schmitz.cz/res/file/jefodalabedafevaniw.pdf
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/1d10a3d3ebc6ca3a9634236b02705e14/75849334374.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/1704699c07f708432bbcc52e46b47700/67571556718.pdf
    • http://abwgulfport.com/uploads/files/bumatidolatezup.pdf
    • http://alexlunacoach.com/img/editor/file/56740459543.pdf
    • http://ithaca1962.com/clients/41687/File/69802191144.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c8ffc7a39---16158402580.pdf
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/07s5akhh3lvju1mtks4g23urin/40812164157.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16073c25106ffa---63593932264.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160855880ea518---48720425690.pdf
    • http://longchimvac.net/app/webroot/uploads/files/xixikip.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af7c513b027---xidovuke.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607301f53c912---2185298938.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/6601d0d40730938d794c06c8c09275a7/xedirizig.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=austrian+post+tracking
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9e1.bin
4d23a71533c4ae1078d5d4789e803388c15ad799c2c3dacab36758e3eb8d4315
pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E1 10544 bytes
font_01_sfnt_off0000e214.bin
5f3d5a982f11518fa5df4be20d254a098bfab8ca4b563146bbc17d5b0aff63bb
pdf-font-stream PDF embedded font (sfnt) at offset 0xE214 17500 bytes
font_02_sfnt_off00010fe9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE9 16792 bytes