Malicious PDF — malware analysis report

Static analysis result for SHA-256 f35848691b9a024a…

MALICIOUS

PDF

88.4 KB Created: 2021-09-23 09:03:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2f9224fd5764438ceaa947d065835916 SHA-1: 575b14854e72218f2d71b160fd085673c722247e SHA-256: f35848691b9a024acce0debe6f3414c1c85d636131ad526f77baa1e9e9d92972
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards a common phishing or malware delivery technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://krisoc.ru/uplcv?utm_term=john+wick+3+full+movie+free+123 PDF link annotation
    • https://magnettoptan.com/upload/ckfinder/files/kipavanelax.pdfIn PDF document text
    • http://chixue.com/uploadfile/file/20210907051242.pdfIn PDF document text
    • https://ofly.om-digitalsolutions.cn/upload/files/36197992590.pdfIn PDF document text
    • http://sententtech.com/file_media/file_image/file/32999059287.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/javemi.pdfIn PDF document text
    • http://designbyjoseph.com/uploads/File/xuromejosumi.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/0590e0f01f6b3e7eb254431a71430f25/sowifobitopebanoregagozo.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/66053490101.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/2a2lfkb1g3okm80sa2j168ulnn/givuloterunufurefuviniwij.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/ligedos.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/gorubugasemefazoduwefataf.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/88055447618.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fffb82b569---juxogenosototukoxukijaka.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/xabejejarimu.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/renofitebunutamal.pdfIn PDF document text
    • https://zhongzing.com/uploads/files/202109131955104317.pdfIn PDF document text
    • http://laguna.piyawatgroup.com/images/files/19869445705.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/jenejumebifo.pdfIn PDF document text
    • https://y3stwk65l-mn9.com/contents/files/jeparam.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/voziwijosepamemiboneg.pdfIn PDF document text
    • https://areicon.com/images/file/tasexuwu.pdfIn PDF document text
    • https://nepalonlineexam.tisaracademy.com/userfiles/files/34995865460.pdfIn PDF document text
    • http://strap.sk/uploads/file/39431883945.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_off0000ee5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5E 10852 bytes
SHA-256: cc47ba727b0afe1735fc5edcef91f31c22bcacf28906e1d4f43215b7da25b649
font_01_sfnt_off0001075b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075B 20008 bytes
SHA-256: 7d7f203d54911388e876004d702c2564f9eb12b197ef8f1e9f2b11263affc04e
font_02_sfnt_off00013bf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1