Malicious PDF — malware analysis report

Static analysis result for SHA-256 a568056322e9efce…

MALICIOUS

PDF

80.4 KB Created: 2021-09-13 18:44:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ffc9beb820a9200da4d240a3fbb6efac SHA-1: 702858f88a098c9cd8401c2eb1d54f9b385cd2c6 SHA-256: a568056322e9efcedbe5f682b831162dd74378ee2c2d0924ea774e85612fd848
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. It contains embedded JavaScript and a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting it's used to redirect users to malicious sites. The presence of embedded JavaScript indicates potential for further exploitation or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://darangyi.com/userData/board/file/46983916294.pdf
    • http://studioriggio.it/userfiles/files/37054261746.pdf
    • http://vinaktv.com/storage/ckfinder/files/96877727182.pdf
    • https://doublehaircenter.com/upload/ckfinder/files/niderujexoraxowuwoful.pdf
    • http://hhoasis.org/app/webroot/img/fck/file/7993651921.pdf
    • http://galluccifaibano.it/userfiles/file/lomijijozuzofosifot.pdf
    • http://malifer.hu/upload/file/57088371444.pdf
    • https://transmar.biz/ckfinder/userfiles/files/33222572205.pdf
    • https://invision.buzyhub.com/files/jitefisewamavifunevano.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/d35a837c69c331e445f18e5a4cb25d22/424278494.pdf
    • http://allseasonsart.com/uploads/fck_uploads/file/luxevewefo.pdf
    • https://oykufestivali.com/ckfinder/userfiles/files/61147619396.pdf
    • http://anchor-m.com/js/upload/files/povapuvegudavumujite.pdf
    • http://heizler.hu/files/file/foseribom.pdf
    • http://nyett.hk/uploads/news/files/64170325545.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/d3f5b562abfee2ff083abc8b400314ff/bisemonirifef.pdf
    • http://wonderful-foods.net/userfiles/file/27101388954.pdf
    • https://hamasataccessories.com/userfiles/files/petusunizajajafizuralero.pdf
    • https://wrd13.com/force/file/90329972135.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/g6vvtrt341lcp1mfblqg7ieta5/tamewemakemasoka.pdf
    • http://halaljones.com/uploads/files/71033409358.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/vme1ntten2osba70q5ememn9k7/nizezoka.pdf
    • http://theheavent.com/userfiles/files/27658747000.pdf
    • https://hchoanglong.vn/userfiles/file/79668411573.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=2nd+line+phone+number+apk
    • 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_off0000d84a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD84A 16792 bytes
font_01_sfnt_off0000f05c.bin
af8358787331d096707e7c692d58165fb64ce978a4463b90a0450b4d7ab52b69
pdf-font-stream PDF embedded font (sfnt) at offset 0xF05C 16748 bytes
font_02_sfnt_off00011c11.bin
d4a577fe5ae41b4e2b76e5fba7161565a0be8832aebdfd0d806d4a2658156f1c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C11 10744 bytes