Malicious PDF — malware analysis report

Static analysis result for SHA-256 72c1fc1dc05f20e7…

MALICIOUS

PDF

78.9 KB Created: 2021-09-04 07:33:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 42dbe030b4f057a2f522d8502d839b6b SHA-1: 4667c35bf21a0083dfaac803e2ebfc773621481c SHA-256: 72c1fc1dc05f20e71dce85c4386b867b73ac9bdf2db0814d306b43f200570896
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://ocw.tw/uploads/files/52122515482.pdf In PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210719_C2AB368FA3A3D8F7.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/juwanolevegiwugawel.pdfIn PDF document text
    • https://meccanicagambirasio.it/file/govafuvakubuluvinojip.pdfIn PDF document text
    • http://evola.it/userfiles/files/tunexuteberexozadonatet.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/88229643206.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fffaa9701cf---15365707394.pdfIn PDF document text
    • https://elminhaj.org/userfiles/file/kebapizuxenuwimazana.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/xuseperikomefejuwebe.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160751c4673c46---bufobofuwapibumijelaxumo.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/81475099811.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/wiguk.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d3ab40675---sesifaresarenawerugad.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/e867e3ec541bb4b6cd0339e9374e7fe9/sijolipot.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609d33ca28c5f---woliledexalegetukezoxim.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e86aab58804---rufapo.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/3808204372.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/zedivizaxe.pdfIn PDF document text
    • http://franklinbristerharveyfamily.com/clients/a/a8/a8910385c57dfddac3c6311e2bd1422e/File/xeweluxafuvogigowuvexojul.pdfIn PDF document text
    • http://freetourscadiz.com//ckfinder/userfiles/files/gesojivu.pdfIn PDF document text
    • http://godswaynehemiahmbc.com/clients/878002/File/ragezusunepisinomodoti.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/98721752736.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/67579141790.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+insert+pdf+as+icon+in+wordPDF 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_off0000c78f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC78F 10644 bytes
SHA-256: edb86b8fd9c38bbde12f0748bbcc2ce2b15fab6f48a46c70326570903cba4747
font_01_sfnt_off0000e018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE018 20116 bytes
SHA-256: 7979529148cbe08aede0943473ec0f7ce876c9878e22653aaa6b4dcf58092132
font_02_sfnt_off000115d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1