Malicious PDF — malware analysis report

Static analysis result for SHA-256 a33a54428531a130…

MALICIOUS

PDF

90.4 KB Created: 2021-08-20 01:47:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 577f4fc6f79b699b318db8e1f3a33ce9 SHA-1: 7979623717ce4adc14e4f70d06818d7b3a5455bb SHA-256: a33a54428531a1307d7e6bde5a647a9be6421e684af246eff197e7e3f82075c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to compromised WordPress sites, indicating an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a secondary payload. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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://pneusmarene.it/images/file/79129770078.pdf In PDF document text
    • http://tnslib.su/userfiles/files/92016504640.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608af3de81876---48336939946.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/tfgmm08884nsiv4tbo69m98v92/kidom.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/8td2lnbcns7mn2rg9614fk04oi/puxewepuruvavuvefosej.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9a7b9e743---jepaxifugizovikutimekin.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736248b2911---samilapexixuvarurulifil.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7cded62b8---92141355400.pdfIn PDF document text
    • https://podgoricki-klub.me/userfiles/file/53263438706.pdfIn PDF document text
    • http://malifer.hu/upload/file/55464227732.pdfIn PDF document text
    • https://kocarbonag.com/luutru/files/sogevo.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/7afef1e17e07abba9e118aa4063cf452/91251099172.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/sesuxuxuwiwugufijutopo.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/5bfb0bce098fa59dd0f547f606ebe400/85788188199.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/ae55cb12189e41b6165351200f0ee2ef/vamul.pdfIn PDF document text
    • http://eva.am/files/8fdcfb1f0932e79a.pdfIn PDF document text
    • https://ewt.cz/res/file/75873130599.pdfIn PDF document text
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/cd97fd49ed17d0460878043e422925f8/23074894655.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ad55cdcc9---tolanigazidet.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074b74b8b49b---62843660693.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/mugizitiviwameku.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/no0i2mrdud9q2a5h9pi3nvumb4/6915698457.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/wuwisagivatajevinesogu.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160b588349bcdc---54180332190.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/47143668224.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/31279288829.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=sherlock+holmes+1+movie+download+in+hindi+720pPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off00013b58.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13B58 19064 bytes
SHA-256: 6b2404f524027f60b3211c2fdf3a147da7722f067d5582b6278f3242e489cc0a
font_00_sfnt_off0000dabb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABB 17448 bytes
SHA-256: 7daa5ed88a33d6356c93445eb195c9a56c57ff3a18b7e46d34d544fe39a15997
font_01_sfnt_off0001089e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B5 11344 bytes
SHA-256: 758f3642b1a8a92cc0fd4aa55463b77cfc8623429122bb19d364acec29cf962c