Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e067007cce80b3a…

MALICIOUS

PDF

75.8 KB Created: 2021-09-29 05:24:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ce147838a8ddd7d47b826890b45c0f83 SHA-1: a082d9c32f76281cc0a24dbbdcacf83d71f27930 SHA-256: 8e067007cce80b3a5daa92cb426177b9bf8e2da3456d39ca8c7f315ac1afa8b1
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 high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to numerous disposable or compromised domains, suggesting an attempt to distribute malware or conduct phishing. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a non-clustered link farm on disposable hosting, and the PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristic points to links hosted on compromised WordPress upload storage.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://dichvu12h.net/userfiles/file/tokikorozox.pdf
    • https://firsatoyun.com/calisma2/files/uploads/xulilajolo.pdf
    • http://www.peritaonline.es/ckfinder/userfiles/files/29416415127.pdf
    • http://yonseri.org/userfiles/files/noxab.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/4bnml8f9m6lb5qip054be4jdq0/ponizebobebavagepodo.pdf
    • http://rhondachem.com/d/files/5948391914.pdf
    • https://vietnam-pump.com/userfiles/file/kisetodugifitikanud.pdf
    • https://kstraders.com/userfiles/file/kukigawop.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f81b92dbc3---zekilowasiguninab.pdf
    • http://hoangminhphatkorea.com/webroot/img/files/3227231470.pdf
    • http://krakow4you.pl/krakow/files/lalivejawivuv.pdf
    • http://strandedtattoo.com/file/80223221625.pdf
    • https://specialgarden.ro/userfiles/file/seduvigiga.pdf
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/zimonomi.pdf
    • http://munnarteabungalows.com/userfiles/file/jopiwiveroxazomuror.pdf
    • https://5974293.pasarantogel.com/contents/files/92695734353.pdf
    • https://ewastexperts.com/userfiles/files/zulof.pdf
    • http://opuspointpartner.com/ckfinder/userfiles/files/71863461112.pdf
    • https://tw-itemaos.com/ckfinder/userfiles/files/52008823359.pdf
    • http://tamtamphat.com/upload/files/58852616948.pdf
    • http://oreade-breche.fr/userfiles/file/rizaj.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a4f3bc9df---bakivamubamasepokidaxipu.pdf
    • http://assytekservizi.com/userfiles/files/wakavuribiromemusotolo.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3b06b78565118f88643368eab4ab536a/lesawolegajexesozerilo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=best+piano+tiles+game+2020
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b000.bin
0ae48a8350dc7bb9b11df056b94b84d970bae5d4afa8ec7c3f2aa8d06b3896f0
pdf-font-stream PDF embedded font (sfnt) at offset 0xB000 16672 bytes
font_01_sfnt_off0000da95.bin
01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA95 16232 bytes
font_02_sfnt_off0000f06f.bin
d42debe5aa43ecd5c676bc608e526d8816f2b5e5c4b64b6754de6b4eeee5cf22
pdf-font-stream PDF embedded font (sfnt) at offset 0xF06F 10792 bytes
font_03_sfnt_off0001095e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1095E 16792 bytes