Malicious PDF — malware analysis report

Static analysis result for SHA-256 04ae582c7abcbbfb…

MALICIOUS

PDF

91.4 KB Created: 2021-06-28 00:05:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 667b8e86cdbfad76f1384dbb085c0ccb SHA-1: 385648b5fc830ba7c1bcd9b5b8fcec9c578312c0 SHA-256: 04ae582c7abcbbfb29c483be17aebd18b10b3e1f8196db127dc87b4c2edad164
156 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://bagiez.de/userfiles/file/vivenunumezisoto.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/sj6vml73isut2ubl2uf4nrc1up/fonegopujusexuvur.pdf
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/1a7a6ad835f7322f38f5d1c3b16c90a9/kixif.pdf
    • http://amuseonline.com/absite/userfiles/file/rexogexepakikif.pdf
    • http://eyupsifalibitkiler.com/resimler/files/96861785147.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16074ff9b1f755---30311528464.pdf
    • https://artasedanasingaraja.com/uploadfck/file/69771730416.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4d950f617---kefivobewisule.pdf
    • https://yodobashi-church.com/pepivepodowizogita.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608777cb1084e---30824901639.pdf
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/68754849425.pdf
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/euof18b26jd6jg9dbhcjcndvd6/wasixoji.pdf
    • https://istanajpdua.com/contents//files/wuvavovidurivekojuwezot.pdf
    • https://aronabritcan.com/userfiles/file/papukuzideduwe.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776c1371d39---setegulodibelobokob.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c94ba11a8d1---vodinozevamonugefulujigok.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806a63308ff---42682599284.pdf
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/580da272380aff8c6f81bfddcade004b/ponovevitilewizaket.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d08187367f---fubokumiw.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608866b062141---nimesogavelawepazitovib.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a899472c2---ketegalibeposusifekatina.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aabe83cdbc---pakeriselepefaga.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+wash+acrylic+sweater
    • 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_off000105e8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x105E8 16792 bytes
font_01_sfnt_off00011dfa.bin
aa93179c129c407790f37ac6d2a86f40ce7068c9a37eeee6c282ce6186d3680e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFA 16544 bytes
font_02_sfnt_off000148dd.bin
91b18a9c0b5e240bc2463d4dd9b1518da80ff891f417e3edd25f459f2dcbcf7f
pdf-font-stream PDF embedded font (sfnt) at offset 0x148DD 10412 bytes