Malicious PDF — malware analysis report

Static analysis result for SHA-256 e670d7a50e26eb8d…

MALICIOUS

PDF

89.5 KB Created: 2021-06-25 23:10:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e39c96dc09c92c51a26c833dafbfd786 SHA-1: 44a39661171bc07993de108972c5110b52de0d8a SHA-256: e670d7a50e26eb8d99cb3cd6177f299946292ad45cfef5da7204479328db7a4c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded links, many pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution campaign. The presence of external URIs and IP address literals further supports this. No scripts were extracted, but the overall structure indicates a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 https://krisoc.ru/uplcv?utm_term=i+might+as+well+try+and+catch+the+wind
    • http://architects-desk.com/uploadsfile/86213539024.pdf
    • http://bindashnews.com/userfiles/file/87143074085.pdf
    • http://martonaroniskola.net/userfiles/file/99006324130.pdf
    • http://bielwod.com/userfiles/file/mevogotinutowe.pdf
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/a97a08122bbb641c6aac735974684b5a/3674196978.pdf
    • http://universalestetic.com/userfiles/file/josisopojuxuduraki.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f0639101f---44566514085.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/6142edd96985863138696e5756b1a48f/44498364288.pdf
    • https://xn--arbeitskndigungsrecht-best-5zc.de/userfiles/file/75188450753.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609406902ccf6---20201901774.pdf
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/53ab43d32e17510d03b80993e2844604/wajapefaxagaliweveta.pdf
    • http://colescastle.com/clients/875019/File/10102713964.pdf
    • http://bscartridge.com/pic/40195895496.pdf
    • http://niszczeniewaw.pl/userfiles/file/63317612129.pdf
    • https://abofahed.com/userfiles/file/25697452996.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/5fddca4155c4e97d7ed416afd362f913/disiza.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbe4740a37---pelosanop.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad1560c73c7---98341537766.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/8c528c7f39fab63e512c2593860ec387/kenegaxa.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160bfab326a7b5---2738238441.pdf
    • https://alternativecarrepair.com/userfiles/file/41719102148.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b38ddb23c40---luxaborumarugefewi.pdf
    • https://stpeterscbs.ca/ckfinder/userfiles/files/buvojamaradujuliwa.pdf
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc62a06463---56369609395.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/121dea8a800227459c2d09d8557d1b45/30304263153.pdf
    • 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_off0000f853.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF853 16792 bytes
font_01_sfnt_off0001106a.bin
45cd38e6fb1a4db799ecc12e7537e49eef9d95c720ba6a0dfb0bb72df83db351
pdf-font-stream PDF embedded font (sfnt) at offset 0x1106A 10848 bytes
font_02_sfnt_off0001291a.bin
80e95cd798f277c584fe1296268fde5e42c44c13a6c76efc8c4ccd44b3615b62
pdf-font-stream PDF embedded font (sfnt) at offset 0x1291A 17412 bytes