Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac34aa478d7390a4…

MALICIOUS

PDF

83.8 KB Created: 2021-08-19 15:17:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e1f149428cb860f5f565412c3f5ab326 SHA-1: cda03c2bef31ea8afdc3400e8c2aff9a3186f25b SHA-256: ac34aa478d7390a4ae16561821ff261b2244d15582b4b0f6c83f751325a468a3
164 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, detecting it as a phishing trojan. It functions as a link farm, containing numerous URLs that direct users to external sites, some of which are hosted on compromised WordPress installations. The presence of 'utm_term' parameters suggests an attempt to track user clicks, further indicating a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://garglob.ru/uplcv?utm_term=partituras+villancicos+piano+pdf+gratis PDF link annotation
    • https://rybczewice.pl/userfiles/file/vuzupopolukewawidabu.pdfIn PDF document text
    • http://svx.su/ffile/file/pafogavameganitejawadino.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611422a5a8835---jatavodadokurobonog.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/1142a0f566bc70674ec57162e88632eb/60195507648.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/54969446830.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e3d6b1c9c---bofepowilaka.pdfIn PDF document text
    • http://kavtas.com/images_upload/files/getoregad.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/50391661689.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16081d5dfb4174---36333278455.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c648758fc4d---87241042438.pdfIn PDF document text
    • http://schooldistrictservices.com/clients/f/f6/f6ab1571d2cdf5e569af7b76e288b17c/File/73807102195.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e37dbddf63c---bitige.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/6ho3rhn6er39chkg4i49nthshi/42063711058.pdfIn PDF document text
    • https://www.leeja.co.uk/wp-content/plugins/super-forms/uploads/php/files/f27e21cdf3afa0b62a5a30b0fbbdf247/41522263356.pdfIn PDF document text
    • http://ehhs1969.com/clients/6/67/67a0fa02f482ea8575b7cec7429e43a8/File/64412649179.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/35233463329.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d798715324---xanosebisitoruto.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/kgpav6g55pncf41c0cc94aacs2/rafejuwiwusenevutufape.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/mesidozuresinudukevedo.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/16ca70de350c62f2644a7d5b78ee4280/razexesidipevazul.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1b1a83030---9393434498.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/78486844509.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/gonop.pdfIn PDF document text
    • https://havanic.com/cache/fck_files/file/naxake.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_off0000e0ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EC 17752 bytes
SHA-256: 13ac83afdeb23690336a0214a0996108f24f5875757025d0352b721616775662
font_01_sfnt_off00010f9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B3 10832 bytes
SHA-256: a8811132c7e802c9f0cc87abfe79376e31fa6becf0117ab077fbd12e09f2a57a