Malicious PDF — malware analysis report

Static analysis result for SHA-256 705365bce5ccce21…

MALICIOUS

PDF

72.6 KB Created: 2021-07-19 02:23:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 327548c266322df307f0c57ca494d4c9 SHA-1: 8da1fbd20c5d5e49b2d85f5d1196d8aac6adbd57 SHA-256: 705365bce5ccce21b4c49f50ec5b39ecf975e2c265955a9b63b407f90ccf3850
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or use disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://zxsolar.com/d/files/junonig.pdf In PDF document text
    • https://atcotourismtravel.com/userfiles/file/zufidowamuzewakur.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093d96c0ab59---95204118857.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/90524444669.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/62203320183.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/a39758b93b3f3eb4375364a3bd214f0c/misutaweza.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/dijenoleledutumuk.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928630169de---45743632800.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/595768ef31d64cb9eb74fa70e857e677/tozomutozixa.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/96068787568.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/kixujemawe.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/lopavaribixidiraraxe.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/9a5f4bc73e360d89ff223e1781acbf61/megirodezozoxaroxowuv.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160904b9dd24a3---ranuj.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb0be1010f---86546170027.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/30054128731.pdfIn PDF document text
    • http://giasudaihocsupham.com/Images_upload/files/dijabonufamajezavavazax.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/sjuo870sr8290l6hpd8jhil3vt/mewifotuwi.pdfIn PDF document text
    • http://shiksha24.com/userfiles/files/vagiko.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b9470a5f3---jevowubagojibuvofejem.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160de92401f99e---zovekexesabitepuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=1.5+billion+in+numbersPDF 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_off0000bbb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D0 10404 bytes
SHA-256: 217b4a7d8295d9eb208860f90ad2ac54df6a9c3a1d5df5438a4d3315f5a0fd05
font_02_sfnt_off0000eb4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4E 15736 bytes
SHA-256: 2e1dffe6c32729530234e484a5fd959f3d9ddfc10d797a9ebf81489f64c93263

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