Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff9cc952fb6fffde…

MALICIOUS

PDF

83.9 KB Created: 2021-09-11 22:16:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 10e11a979c7fffdcf302d8d467f4e3f0 SHA-1: 83bcc2d0262720668a90b3f8f64c012fcff26567 SHA-256: ff9cc952fb6fffde40cc98d26ec5d5cf737e0321eb09546e87b4ade4a536fc6e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://tareeapartment.com/user_img/files/zetexamafuzifatolidutin.pdf In PDF document text
    • https://kligi.viart.lt/ckfinder/userfiles/files/buzikar.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/3466018a63cebe298d7633aa92d2f97f/97192185505.pdfIn PDF document text
    • http://asclyziarskyklub.sk/userfiles/file/kepozekekawajodafepatugux.pdfIn PDF document text
    • https://best-label.com/upload/files/xufepanetefesinabopaw.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/luzufakovu.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/gikapebizovaxa.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/36fb4cae2f429bfa84cb58fddfe8423f/71779070821.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/64486f96519225293e13208eeecf2c49/gibejomodikofuzupopilabod.pdfIn PDF document text
    • https://pasarantogel2.com/contents/files/xugatajusubesutolijuru.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613ada6477aaf---78237856412.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/34692248362.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/zuladen.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/25188493627.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/55805731134.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/jebuxefogegezilisutiba.pdfIn PDF document text
    • https://groupunsur3.com/contents/files/62780437562.pdfIn PDF document text
    • https://dallaslandscapedesign.com/media/files/24584037263.pdfIn PDF document text
    • https://harmony-lazienka.pl/Upload/file/zazod.pdfIn PDF document text
    • https://estatecambodia.com/htdocs/cljr/data/files/siwage.pdfIn PDF document text
    • http://coffee33.ru/archive/file/tijexobizetobomadu.pdfIn PDF document text
    • http://nakloboucku.cz/uploaded/file/lukokunibezazep.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/gigoboji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=best+tv+apk+2020PDF 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_off0000e044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE044 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF856 19536 bytes
SHA-256: 775a4783dcac81bde386a777b385c3b41cbad91d61e80f1ab4e4a35591153570
font_02_sfnt_off00012ae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE6 10236 bytes
SHA-256: 734b4fc673daeae02ff50ccca7ee326d60ed3752bb09795a6da5fb8dea1a1292