Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f3c1826e9f21084…

MALICIOUS

PDF

77.9 KB Created: 2021-09-11 09:33:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 361c9cebd46106782853fbb3ff9b92cb SHA-1: 4b23febc5072b8a4df449e6b5054aec4f262a998 SHA-256: 8f3c1826e9f210843f623db7401051fb0794832a46947c0cde0915f6d2d30006
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple disposable domains and compromised CMS upload storage, a common tactic for distributing malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL heuristics are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://budapestpainter.hu/ckfinder/userfiles/files/jiniwosejolil.pdf In PDF document text
    • http://come2menorca.com/images/file/zakipubi.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/34888635910.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613a90493797e---dojirir.pdfIn PDF document text
    • https://redengewinnt.com/userfiles/file/janapapagigemodaxuzor.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161337088937b2---dusuburikagedosinulaxobow.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/nawuwavodadokibiwuwuxif.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/fovixavogesi.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/fogunajowakifuvazolujogij.pdfIn PDF document text
    • https://tamphuctriland.vn/upload/files/bimutajelotivas.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/gegenewegaxapumide.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/zowunejawinevuwijeni.pdfIn PDF document text
    • http://maychebiengoduykhuong.com/media/ftp/file/mutopefafunozakosira.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/76928261130.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613365a035f7b---mijipurewefemo.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/tokuwamutixe.pdfIn PDF document text
    • http://xn--989ap7r0xbd5x.com/upload/fckeditor/file/sajodadibubogusod.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/jabuxubukazob.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/80184887298.pdfIn PDF document text
    • http://huemin.com/fckeditor/userfiles/file/88275694912.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16132b95f47995---paxuvebadenajixubaje.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/wusaregejulujiza.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/totigudon.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/korabuweluvafo.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/78345164035.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=boss+full+movie+watch+online+free+akshay+kumarPDF 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_off0000caf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF1 11112 bytes
SHA-256: 7b4da1c913f049e5411ca392497ead1c2aec5d8f92eabbf36ef01aeb4cc21878
font_01_sfnt_off0000e4d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D2 17424 bytes
SHA-256: 075ee7b141221cad5c22d0202db7dfc43c53d89f36a9c1fc77b2525a2e7ca6b8
font_02_sfnt_off000111ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1