Malicious PDF — malware analysis report

Static analysis result for SHA-256 4de430a7e360ce74…

MALICIOUS

PDF

69.5 KB Created: 2021-09-20 14:32:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a2c771c13f7d0e71a71b9c47a06d56ed SHA-1: b958bab15673f3b26a2063ffefcd2191fbc33c91 SHA-256: 4de430a7e360ce74e63de92f87fc28107c13b4e2a84431b88d103ecd2f086c79
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of numerous URLs, many associated with WordPress plugins, indicates a broad effort to redirect victims to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://ketchas.ru/uplcv?utm_term=pro+live+sports+apk
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/00b623jck5l7plt0s1mivdup7t/kuvetujogiju.pdf
    • https://maria-galland.ru/files/file/fobidataxovagitazetoz.pdf
    • http://tv-sat.cz/userfiles/file/59371226471.pdf
    • http://savages.lu/imagesRTE/files/19508170759.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161452fdac62c6---zizelodeduzerig.pdf
    • https://traffictkt.com/viking1/uploads/files/sabudiwitugujod.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133be5fe2939---lenulomafe.pdf
    • https://corpeverest.com/ckfinder/userfiles/files/savuboma.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae0f1dbf68---85940873529.pdf
    • https://jmbarrenetxea.soinuenea.eus/files/galeria/files/95123753337.pdf
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/25038555833.pdf
    • https://medbioplast.com/klucharnet/images/file/83335896841.pdf
    • https://hbphoto.ca/resimler/files/23996140035.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140bb248fb32---susovawuxajexupev.pdf
    • https://www.babetravelling.com/ckfinder/userfiles2/files/duvufufodijixutuv.pdf
    • https://stmpallet.com/ckfinder/userfiles/files/55213922184.pdf
    • http://tea-ra.com/user_data/upload/save_image/files/703379912.pdf
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/93472137842.pdf
    • https://drjou-vc.com/upload/files/17106584220.pdf
    • http://coachhouse.info/assets/file/ramuzomibawibemoziribamag.pdf
    • http://hoangduy.vn/vn/files/48672021911.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4ec939e10---71692128655.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/phh0se0du4fakm2g766kh2kqdj/jetuleguzawajinofafezum.pdf
    • 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_off0000b497.bin
bbe0420e4c2b097ff7aed99b639d646f994025274ff04b13a47b37f36fb6f871
pdf-font-stream PDF embedded font (sfnt) at offset 0xB497 14568 bytes
font_01_sfnt_off0000d8f9.bin
b2133152bb5ed0d1fb12a6e1d8e209b8b186873f8c10fd917637a5a103fa8a39
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F9 10300 bytes
font_02_sfnt_off0000f05f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF05F 16792 bytes