Malicious PDF — malware analysis report

Static analysis result for SHA-256 672d73ea7c737c80…

MALICIOUS

PDF

73.4 KB Created: 2021-09-25 12:42:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 02f5bb1743b567339d684324ce8f3a1b SHA-1: 9bca7c83df770b9dd8b5b253166ce98bf1950779 SHA-256: 672d73ea7c737c80ce90bc41bc9ae913ebe35ce478c34d7a54a0e74d39e14a00
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 numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The presence of external URI heuristics and link farm indicators further supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://huntic.ru/uplcv?utm_term=icse+class+5+science+book+pdf PDF link annotation
    • https://havadisname.com/upload/ckfinder/files/biwebexonix.pdfIn PDF document text
    • https://pastelbuilders.com/userfiles/file/57648711707.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/pev7gg5d2iehct3uau43u6adv6/96429301121.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1631508304.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/puvumebo.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/tewokemolunigiv.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/bf51574ff3ad9d4c6d716c54714424e0/xojasuzazodakadovi.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141df1075b14---42921833138.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/jodadu.pdfIn PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/86638217628.pdfIn PDF document text
    • http://sial.pl/galeria/file/zaxameguganuxobuxaviwefox.pdfIn PDF document text
    • http://decorstore.eu/upload/file/42501423448.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/piwobopixopodilul.pdfIn PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/jobisapijidimapis.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/7e8113f69f4205d42b36dfd80dfa4910/tonaxonekokifutazuko.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/71743589103.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210922_85E8A44133D3F91A.pdfIn PDF document text
    • https://ms01bet.net/contents/files/32799763360.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/efc6f502cd5b3c3ddf68dd906244471c/83251348580.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/8842864879.pdfIn PDF document text
    • https://demo.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/18824309271.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/lagoxevumekovovigitopolex.pdfIn PDF document text
    • https://unitedpetexpress.unitedreloth.com/ckfinder/userfiles/files/gujufu.pdfIn PDF document text
    • https://dolaodong.baohohoanglong.com/userfiles/file/49889099519.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/62920548528.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_off0000baa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B4 17312 bytes
SHA-256: 270486dff4a4d843ed2ee15368319c8ebd09dc4016d5f0f92a2e797ea427a20d
font_02_sfnt_off0000ff36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF36 10732 bytes
SHA-256: 4eb55e363fffd8cb2c1919b6b477d206d3d0b8d16128dc1fdd141656f9942cbc

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