Malicious PDF — malware analysis report

Static analysis result for SHA-256 82386345a6014234…

MALICIOUS

PDF

95.5 KB Created: 2021-08-11 15:59:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 971ef76dbdaf0e6d3d2efcdd82bf106f SHA-1: 11e03e6a6c6e9cf2446036680631638413058d21 SHA-256: 82386345a6014234c0586cac3d7fb12bafdf775034e19dfa31f8af76d68c9970
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or delivering malicious content. The PDF also contains numerous links to compromised websites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=total+gym+workout+routine+pdf PDF link annotation
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160833d7325427---79787250511.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/da657f812c41c8da4be6ccc3aa89b47b/zisofujibinapase.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/e30a83884fe17ec2f29051d93727258d/40415838520.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/pijobo.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-8/file/69268665970.pdfIn PDF document text
    • http://eternoohydro.com/d/files/dirojoseloxizu.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/soloporanojuvi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4324d6041b---xodafaxeraxisaturemat.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/zofinapim.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/masivizesofuni.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c6aac78305c---devizekaxos.pdfIn PDF document text
    • http://aquatherm-graz.at/files/fopan.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c29876dccb8---revopu.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/gubelagowa.pdfIn PDF document text
    • http://nfc.soo.jp/file/14008327516.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/jakuvet.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/10150212930.pdfIn PDF document text
    • https://aedwea.com/upload/foto/furifazoneded.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606faccdd6959---lexobifaxigigewu.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/1bf6e2347a6dc3afb22a8c47a2e783fa/95900584566.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/c336b66467228a57732680f6f39285ac/buwobovabo.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/xujakibiwiberigijerumijog.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/ruk1f1u6uhsgnd2cf1inirml95/88780591230.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ba2913d92f3---gegulizoxodujokafeva.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/livunajiwofon.pdfIn PDF document text
    • http://latexindia.com/userfiles/file/78798489450.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_off00010f09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12720 11028 bytes
SHA-256: c81afef7c757a036412eb76ab82f971fb17f7f66cf2f54d1effbf30dfed81fef
font_02_sfnt_off000140a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140A2 17732 bytes
SHA-256: 15466fcbf88f842727852df7ee5c4f03a14e697401e448f624110d8fbe11bbcd