Malicious PDF — malware analysis report

Static analysis result for SHA-256 23aecec93e324159…

MALICIOUS

PDF

230.7 KB Created: 2021-09-07 04:38:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ff108e59b3fbe974099b708b4241a803 SHA-1: 248b7ddd03b299d0cb8f8c5a113f8e603f3a26d0 SHA-256: 23aecec93e324159ddbb79147f70e2421264a425be12ae18a75b83e74c0ca9f9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including links to compromised WordPress upload storage, suggests the file is designed to redirect users to malicious content or phishing sites. The PDF structure itself is also flagged for potential compromise, further supporting a phishing or scam attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9739

Heuristics 5

  • 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.
  • 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://huntic.ru/uplcv?utm_term=cours+complet+de+droit+administratif+g%C3%A9n%C3%A9ral+pdf PDF link annotation
    • http://grandp.ru/userfiles/file/jasusovatamobo.pdfIn PDF document text
    • https://bfull.ru/uploads/files/55898601096.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cebb9f63bbf---84268581973.pdfIn PDF document text
    • http://npas.ru/pic/file/61060520947.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/51111178870.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da9e89903a---juviz.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed8b9a8817---fokunegeredatawixuba.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788951d95f7---7988620920.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16072467020ce1---mikeguk.pdfIn PDF document text
    • http://meta-min.com/files/mafirobitepomoxa.pdfIn PDF document text
    • https://cyklo-wellness-penzion-palice.cz/content/kirozudupev.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080dd15a7b9c---rutejagumifejeruxuw.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d686dcdf99---5162131652.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/3pngis99lrmuesbp7cu5cvv9q4/siburesaxikiwidamob.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/637af7baea6e0ac0032112de95258edd/muburolozarijadavomakije.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/61036241627.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210629125147_93usmb.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/26017201862.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/rujetewivuxag.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160aaedaf1c3f5---66871253835.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/6prafgq000gm30eifp3bfm2utg/rejilupukuju.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607364ed59cb8---niwitasobika.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/wifoxagebinigenagok.pdfIn PDF document text
    • http://uhorder.com/upload/files/10238725217.pdfIn 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_off00031b07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31B07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00033319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33319 24008 bytes
SHA-256: f89954c173a449a1ed2dab6b77f6a72eaa50d71a240a5233028f165495866a99
font_02_sfnt_off00036f67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x36F67 11248 bytes
SHA-256: fa233937f7a8bc73f10fe06c8fdedb68f9ae570910ed6a712ae56f72f7a6391c