Malicious PDF — malware analysis report

Static analysis result for SHA-256 63d5f9ecdbeb995e…

MALICIOUS

PDF

82.9 KB Created: 2021-09-05 21:43:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 61c8813f1121637359a1a27b090ec900 SHA-1: 3575550d568835bfd4c213c534a217f537c3d78f SHA-256: 63d5f9ecdbeb995e1dd11c574107caf1500740af77c6e5dc614353c1d6f87ef8
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to compromised WordPress sites, acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing or a trojan. The primary attack pattern involves luring users through a malicious attachment to these compromised sites, which likely host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/iid2vncgojdhmgo2sahrbvuh20/kaluvigibatizugalumikor.pdf In PDF document text
    • https://tenekedjieva.com/uploads/file/gusavobobudoposukuvabofuv.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/lulujarivibaxija.pdfIn PDF document text
    • http://music-summer-courses.eu/upload/files/zesozibur.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ecbf8cecaa7---66005431818.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/kizaluluwojibaloborixevuf.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/0uhlgrljgnbj9btamcpil7a5cm/71342308355.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16124eda68e8c8---88851315739.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/nozig.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac07f608a37---lamunus.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/47335223388.pdfIn PDF document text
    • https://enkaotomatikkapi.com/depo/sayfaresim/file/vodusesipubose.pdfIn PDF document text
    • http://coss-wynn-reunion.com/clients/d/db/dbe3622004495b304d8703879a486b7d/File/29295745405.pdfIn PDF document text
    • https://t2sc.me/userfiles/xemifevorekopepufirobo.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/47129949525.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4ec907334---19750969085.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/79ea63b29e30c074d9340803e179bf3e/pexinebopivonokabax.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6931db6f2---30504968059.pdfIn PDF document text
    • http://oodow.cn/upload/file/210727213623774914hyll0tpo96s9.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/64932098215.pdfIn PDF document text
    • http://palami.by/images/file/gowukegetibavaguduzadeg.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/85918297217.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=cuentos+en+quechua+boliviano+pdfPDF 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_off0000d8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D8 11100 bytes
SHA-256: 85c27f0a22ef2a5dd736c0a2ca310eb9cb588874c59611c99da7eadb74511816
font_01_sfnt_off0000f24d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24D 19372 bytes
SHA-256: 42d5df495054e783879183d050192347271b87838d49b1b492262419cd426893
font_02_sfnt_off00012406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12406 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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