Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bf62146daf9cc49…

MALICIOUS

PDF

82.4 KB Created: 2021-09-22 17:24:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e139b7c44641b07e513afcc3f73d2416 SHA-1: 7be48a24db148f924b926fbf097b33a3f8be9e1c SHA-256: 7bf62146daf9cc49ed0b678532be651fd721e6a310685b76716f8e9c7b2fb79d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The presence of embedded JavaScript and a high number of external links, many pointing to potentially compromised CMS upload directories, strongly indicates a malicious intent. The ML classifier and ClamAV detection further support this, flagging the PDF as malicious, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate malicious actions, such as redirecting the user to a phishing site or downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/rekakogine.pdf In PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/nufawozaropimerulegemazab.pdfIn PDF document text
    • https://ceccarmaramures.ro/userfiles/file/22220532633.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/jalisopup.pdfIn PDF document text
    • http://mobilenmr.com/files/files/toles.pdfIn PDF document text
    • https://loonbedrijfschimmel.nl/userfiles/files/24936672273.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16141a18165027---debegoraxirodimadotuw.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/josadipudibura.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/bamalip.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea47392fb7---91471993048.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/nizebibikozedokozas.pdfIn PDF document text
    • https://shinko-tw.com/UserFiles/file/lopidefasewikanaruvej.pdfIn PDF document text
    • https://miraclechuppahs.com/userfiles/file/nisofovadunuxefek.pdfIn PDF document text
    • https://xuanhongkhang.com/upload/files/97867403595.pdfIn PDF document text
    • http://slmj8.com/data/userfiles/files/batifigowimexivanugad.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/85018111176.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/nixumumezarixudakaxaxa.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161316bba47023---5723449076.pdfIn PDF document text
    • https://hamzakocakoglu.com/userfiles/file/51820996443.pdfIn PDF document text
    • https://lapakunited.com/contents/files/duduwixadewikopadomax.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/78scrldd710e4eoe1q8903b9fb/12997842572.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/51076828804.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/10957327843.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=do+i+have+screen+mirroring+on+my+phonePDF 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_off0000dcce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E5 10856 bytes
SHA-256: 4cdc5310ad09c0840dc6acf1252e11fb65087e3cc7aeeeda314844ebb7831e9f
font_02_sfnt_off00010dca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCA 17804 bytes
SHA-256: c53a151e157ccfae0b3a53002abfca0ffb217f8d022c08ee5bd0067819982e60

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