Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d9a4a49489ae4ef…

MALICIOUS

PDF

84.6 KB Created: 2021-06-27 21:45:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cb2baaaa7440d694997a4343a47beb6b SHA-1: 9bc73d8daf523d6238203d9d8b445539b68eb40a SHA-256: 6d9a4a49489ae4ef38cc6db66f014743f18f3f159de65a7b1513d426ddc3708f
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to phishing sites or download further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd185f0076---28496048077.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/1e0b560f966e80042eac5cae06f486ee/79684613326.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce36ec7bab2---66084460425.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a0cb699beb4---xosavixapigelukinifemugo.pdf
    • http://asupuro.com/user_data/image//file/27685314762.pdf
    • https://bandai-k.com/userfiles/file/zigafefo.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609fee101105f---68261267979.pdf
    • https://olterus.com/contents//files/1234184713.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac53de65c66---juxegof.pdf
    • http://a-kamen.com/userfiles/file/vuxadajematidawekade.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076746613897---difelugikubomakus.pdf
    • http://aquatrustfina.com/userfiles/file/1679103302.pdf
    • http://adveotec.com/img/file/95130828744.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfa9c476a5---70022387959.pdf
    • http://wildpflanzen-planung.de/file/69395819447.pdf
    • https://nasikampung.info/contents//files/migalijeput.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/a176358213fb8ec0d0b7c2ea49931252/80345373529.pdf
    • https://mfdesign.hu/files/file/rajilupalewut.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d4285b6b5---mapefinorafobetawazux.pdf
    • https://landi-bg.com/images/file/gesug.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b86ad12117---jesuxiwamalivala.pdf
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/benfhrpo9nlafv750lcd76nai2/kakepukekimadasafux.pdf
    • http://i-daa-wl.de/userfiles/37269675654.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/41c9eda90abe445f020bb946cc659a37/nifajojek.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=retinoschisis+and+floaters
    • 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_off0000e6da.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DA 16792 bytes
font_01_sfnt_off0000feec.bin
9e9ea0e8f8701614a594d1c0ecf9602a3f8ab1d4b0e99a223465749a8e387d35
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEC 17128 bytes
font_02_sfnt_off00012b83.bin
6d53b8b9133f217655cea250c2bab779d7d1023071be7cc9772b9adbce23e3c6
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B83 10620 bytes