Malicious PDF — malware analysis report

Static analysis result for SHA-256 39ff45d9d2131a53…

MALICIOUS

PDF

83.3 KB Created: 2021-08-01 02:51:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 551bc7cb2379de4f084546a930a2aaa4 SHA-1: c1e511a0bdf1ae5f056ba08b1520a7aef5e72358 SHA-256: 39ff45d9d2131a53d725fa90675e071305e4f7d5cef8c02a4681a57ba35249ac
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, indicating a link farm designed to redirect users. The primary purpose appears to be directing users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/af23ebef7cb7bf681c9f988a3e01c132/54246528281.pdf
    • http://highendschmiede.de/highendfiles/file/neneviwisitafefujol.pdf
    • http://bindashnews.com/userfiles/file/69159112573.pdf
    • http://princeworldwide.com/multimedia/userfiles/file/ruzinifekijabum.pdf
    • http://texmet.pl/userimages/file/foratikebulifixazota.pdf
    • https://oversaslogistica.it/file/loferedirapuwupupir.pdf
    • http://filtrydokoparek.pl/img/all/35611795902.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/b5abcfda4a8cd8141e172419493bdbe0/63610957042.pdf
    • http://viviapalermo.com/userfiles/files/55002814232.pdf
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/76647142173.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16071e3be5d5dc---92281333443.pdf
    • http://deficanderel.org/clients/6/67/674a09facce11b7629d390eef9534ff9/File/9324988357.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810dae8be4f---31739022721.pdf
    • http://mayjack.com/upload/files/kusirupupereminamis.pdf
    • http://files.ibiza-ferien.de/file/26393246545.pdf
    • http://dansecyr.ca/pdf/file/58091855971.pdf
    • https://actor-conseil.com/files/file/vomizafi.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/92sdcgivnjt3qqnu02lcle2mcd/37713440092.pdf
    • http://blueyee.com/upload/file/172214206430.pdf
    • http://lamelove-zakryti.cz/userfiles/file/2993966743.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c295f97685a---34790704485.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/ehaqokcgksvcpnervt8i8l38r3/56848545305.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/2c8fb7ecd3995f40f2d52ae0b7e8a29e/metemafixerixemile.pdf
    • http://iweldbot.com/ckfinder/pho/files/39009652349.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=actividades+de+lectoescritura+para+primer+grado+pdf
    • 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_off0000dc00.bin
28a7dfcb0b1c83aa2094ede0652c156f4e961116728aeb9e65595b3239e65f24
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC00 11004 bytes
font_01_sfnt_off0000f574.bin
6f35af87814f047cb77be616416d1f275f900ce50fd30dc03894be6b1509cbfb
pdf-font-stream PDF embedded font (sfnt) at offset 0xF574 18644 bytes
font_02_sfnt_off0001242f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1242F 16792 bytes