Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b99bcccc2ffb968…

MALICIOUS

PDF

68.4 KB Created: 2021-09-27 18:37:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 592d34dd5e21165157023960428ca2c3 SHA-1: 1b671532b897ee327d940b15ce7481b3fa6815c7 SHA-256: 4b99bcccc2ffb9688e6c2a19eed731731b4cdd37de77a427e3face7f464d3d45
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains a link farm with numerous URLs, many hosted on compromised CMS uploads or disposable domains, suggesting an attempt to distribute malicious content or phish users. The presence of external URIs and a link farm structure points towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://www.highlandernepal.com/assets/ckfinder/userfiles/files/deledewesedisezezewafo.pdf
    • https://chiuman-hk.com/images/file/33757440381.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/91heguh71c2cddoiri1tnjg7um/xuvijujamolijagufuje.pdf
    • https://soechi.com/userfiles/file/watesepo.pdf
    • http://liily.jp/upload/file/20210902081432.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614e9f23037c3---70101052267.pdf
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/94217811089.pdf
    • https://haltia.mx/sii/ckfinder/userfiles/files/nodajafozodinawuvuw.pdf
    • http://tpdw.pl/userfiles/file/45814433904.pdf
    • https://businesslife.com/content/file/57273932570.pdf
    • http://banglatalkies.com/dynamic-images/cms/file/78390479801.pdf
    • http://amkchem.com/upload/files/58819976763.pdf
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/xivaferelewoxamudegaxonak.pdf
    • https://cupanghitam.com/contents/files/bizofomofawikipifesu.pdf
    • https://tonere.shop/app/webroot/files/userfiles/files/95748890610.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16141eb7cb8f55---26447511281.pdf
    • http://prochem.vn/images/uploads/files/60471649835.pdf
    • http://yuilchem.com/userData/board/file/koselinewisavivuges.pdf
    • http://rwdwebwebdesign.com/img-aim/files/kuvedumurokonezorevakamaj.pdf
    • http://millionsdiscount.com/mo_images/files/70535155498.pdf
    • http://giga.sk/storage/file/fifeto.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=gta+5+online+play+now+free+android+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000adda.bin
907cc2fc03bc61bcf3e65a25a61db4401652784755e39fcf36c5ef53d55973b5
pdf-font-stream PDF embedded font (sfnt) at offset 0xADDA 10696 bytes
font_01_sfnt_off0000c6a0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A0 16792 bytes
font_02_sfnt_off0000deb2.bin
1e237b1d38d6de4472f13238d3874f4486e334afbf1d3da7719a37288d7a65fa
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB2 14644 bytes