Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcdd8c999887ab30…

MALICIOUS

PDF

208.8 KB Created: 2021-10-06 05:21:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 5b4656501eebde9b175975017ab3a253 SHA-1: 0a9974b7436da2f3f48e514c61c3a8eb2c83aa7c SHA-256: dcdd8c999887ab3060da882538a84fa609058fdb61731432193a129cc0946917
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, including one that appears to be a lure for academic exam answers. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the compromised CMS upload link suggest the document is designed to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9747

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://chcial.ru/uplcv?utm_term=penn+foster+bookkeeping+exam+answers PDF link annotation
    • https://vzglavniki.net/data/file/5577733044.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/52e7f6e9a2fd0b0255e99d9c551e037e/60879171801.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/2adca243305a23ee2b1f8f61af6b7c16/woxatumisobezazofo.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/77745980656.pdfIn PDF document text
    • http://houtackers.nl/userfiles/file/79046196280.pdfIn PDF document text
    • http://okwmd.com/upload/fckeditor/file/5149478286.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/jorejaje.pdfIn PDF document text
    • http://mcserpenti.com/userfiles/file/89959515945.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/35878553574.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/wafibikizuj.pdfIn PDF document text
    • http://minerva-collection.net/files/files/9837565751.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/poxuwimaj.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/garipira.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/66528133407.pdfIn PDF document text
    • http://baove247.org/upload/files/74355102458.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/34d5db7127bcebfb5b1963e3954eed74/22804068288.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/zuxajorovujebuvufonopup.pdfIn PDF document text
    • http://bekescsaba.varosom.hu/userfiles/files/16361672618.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/rulapoxos.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a05be5db55---86730028668.pdfIn PDF document text
    • https://chineseclothingonline.com/File/bimonavix.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/jobutasifabug.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad6518b36e---sexisedoxo.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/d4e0c02dc090e89fca871599fd48d20d/18882893695.pdfIn PDF document text
    • http://iiiemjobs.com/FCK_Editor_Images/files/67923178520.pdfIn PDF document text
    • http://pfanswersagg.info/followingIn PDF document text
    • 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_off0002cbab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2CBAB 21564 bytes
SHA-256: d4f931f6180059997a64d3efcf9fe1c14da9854508365f9a87fbe25653497994
font_01_sfnt_off000302c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x302C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00031adf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31ADF 11076 bytes
SHA-256: 08b0ecb635019fd15cb38c8e823e56ea339c8abe8adf9d3a8a2b6f34d9e29b1c