Malicious PDF — malware analysis report

Static analysis result for SHA-256 848314c52ce495c0…

MALICIOUS

PDF

81.5 KB Created: 2021-07-15 19:43:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f94b06bf9b2e7ea9fac61d0e7790264d SHA-1: c4ca298af327a88812bf148a5f7943d3d14cdca4 SHA-256: 848314c52ce495c0c76afed6161901e98d819092bb34d3b2af109f2920e9905f
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites and potentially disposable hosting, suggesting an attempt to redirect users to malicious content or phishing sites. The presence of multiple PDF link farm heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://jarosi.hu/files/file/35068044770.pdf In PDF document text
    • http://nhaphangmy.us/upload/files/94835434943.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/t09ojghr0dpqh2aof8l01k948j/39257951848.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/76080561214.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/545ca8895af4675f89536728242a9cd6/lekesegoretivenofopego.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609294f75cea2---fubuwoparuludam.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/mejeruwobodusosanumewozu.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16094e950ea989---soguxavixojinuberexeb.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/lupisametapenezati.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbcba93d592---zozoze.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/38833dnll2j53qo4kjb857n7jg/22307079203.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/eb0ba7519d9addfd21c16e5dcf47ef99/kivisikirigobavi.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/7219751700.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/gusesutisori.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/97610888781.pdfIn PDF document text
    • http://charivne.info/images/file/76584081295.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/14462157444.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/dibotunapizalufobed.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1607b624e93909---83132961096.pdfIn PDF document text
    • https://ijp2.com/contents//files/74216999344.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609496a965aa8---nuvogusirafe.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/8235e5722681d95971fe3556a460d395/gelamavula.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4650a3c71---33763315219.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16094b2b0d2623---jifawimon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=adding+and+subtracting+fractions+worksheets+pdf+grade+4PDF 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_off0000da53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA53 16688 bytes
SHA-256: 3234ae5b26607133d3978ce6b13aea166d84523e315a640f0bd9d7497ea5cb5e
font_01_sfnt_off000105e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E4 11332 bytes
SHA-256: 14830d9176c5b8b3bae89e5d339284c67d3dd58c570e1d5f60a570ecdc838517
font_02_sfnt_off0001203c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1203C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1