Malicious PDF — malware analysis report

Static analysis result for SHA-256 80b77a486cbbb752…

MALICIOUS

PDF

81.6 KB Created: 2021-07-07 14:07:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 9af620888acdecb20d3283d612806fe7 SHA-1: 3526a472b62ee663a5239a5980267c591282f190 SHA-256: 80b77a486cbbb752dfee4a0ac1c46ae583bf5b33af307659976becfcf7800d8d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm hosted on disposable domains, with multiple URLs pointing to compromised CMS upload storage. The document body is unreadable, but the presence of numerous external links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://primax.fr/wp-content/plugins/super-forms/uploads/php/files/ham4dbadujvnp69t8p6dm1ivq1/90423748138.pdf In PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab888de673d---wuzuvixekizo.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/87196432349.pdfIn PDF document text
    • http://digifast.cz/userfiles/xegarabomorumepotusofepul.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/b8a1dd3364235dc81199a50d8c6eec79/bemisafujivafijif.pdfIn PDF document text
    • https://xn--faade-zra.ch/ckfinder/userfiles/files/24375075710.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/eb3ee5ee314e2bba7ee298f726ae6993/dulikipod.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf0be2340c9---widepazax.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f09fb4701d---92021844110.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c462f564de8---80898700231.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/f49948ahfkprt3jfhuegq1262j/kukesomijukipir.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/88430338989.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/kezabunatinu.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/73ecj4fvliu20aum1j6to28091/33633827835.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/ec57075d54e8c9429f4bd888fb840fed/40743468869.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/70uki0aguln8874d8ipmei00in/53851658594.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/9f5fd374dd8d4260a3347b44e7583e91/zetolofinon.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210613_FD90DB5276EECDA2.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/birizedafonefosuwifoboja.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/5a35d5db50a37cf8f96ddb8c02f6fba0/34535579177.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffb18a6496---mepukasu.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/82c5500c060dee3f514776c1a7d6b249/17328925308.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a1ff4f2ca---wubisuxafe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=the+light+of+god+surrounds+mePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD653 18344 bytes
SHA-256: e0cda2dfe53fa48364a2a6cabc1585eb2fc6e1624a4a7df7940e99b84f4c5607
font_01_sfnt_off0001071e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071E 10700 bytes
SHA-256: 83172aab7c09edecd5f20cbdae51b58c41398420aa973f01870ac74b527339a4
font_02_sfnt_off00011f43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1