Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2eaa19680bbf3fc…

MALICIOUS

PDF

75.4 KB Created: 2021-09-28 00:01:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 73637239b60e338652b1b63f66feb87f SHA-1: 12f3aeb71961f471eef91dcfccec3b4731934e94 SHA-256: f2eaa19680bbf3fcf2ee2cce33f741838cc80cea60e83e9fe9c60872583b54e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' reinforces the attack pattern of luring users to external sites. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://smidgel.ru/uplcv?utm_term=speech+to+text+offline+android PDF link annotation
    • https://bnovum.hu/downloads/94235715412.pdfIn PDF document text
    • http://otworz-biuro-podrozy.pl/userfiles/file/38920637961.pdfIn PDF document text
    • http://elfast.ru/userfiles/file/kunaxudizimexorogu.pdfIn PDF document text
    • https://nasikampung.info/contents/files/78812923066.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c02d9444d4---nuzerafobixasok.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/17407099294.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/69845691010.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16140c1b894111---21582892831.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/161505fde0a68b---tubipasexazutezifonew.pdfIn PDF document text
    • http://stringladies.cz/userfiles/68719212061.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/watasagerevumapiwope.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/xupavatuwepujidani.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/84f4809c48b6ce1e47e17acfd5977fbd/raderidu.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/16178523707.pdfIn PDF document text
    • http://levant-tekstil.com/other_files/File/mikiribapa.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161379cf267353---97110550892.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/58799729144.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/jimebomobojadiwikab.pdfIn PDF document text
    • http://findacommodity.com/upload/file/29633442789.pdfIn PDF document text
    • http://maychebiengoduykhuong.com/media/ftp/file/dojifasa.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/getok.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/40768147915.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_off0000bd85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD85 10724 bytes
SHA-256: e24bde786f9bc4778895ea688108ffde8b3a2fc9cac848ff176ed6567766f5a1
font_01_sfnt_off0000d616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD616 19216 bytes
SHA-256: b838fe1e00045c649ab21b585b811bcfd9274e204fc5285293429ad08dcdf77e
font_02_sfnt_off000107c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.