Malicious PDF — malware analysis report

Static analysis result for SHA-256 8916ffe765c4f95f…

MALICIOUS

PDF

88.6 KB Created: 2021-09-08 03:50:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 857b20b00f8e945d9bb2d32fcd2e6325 SHA-1: f8d54d59e33c31960e799bbbb19351c398887693 SHA-256: 8916ffe765c4f95f9e60196ee110a4b2c273f8392b0e8b865df2cef4be7217e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating it is designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to facilitate the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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 https://ketchas.ru/uplcv?utm_term=penang+tourist+map+2019+pdf PDF link annotation
    • http://mousike.it/img_ins/files/92705374741.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/26579df39e4553ee42016ee3f7b938f4/72229909055.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/uvgv067lm5132hcu481d2k3ikb/85163067662.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/xiloxidosubagajuxegu.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e8a9b3e99---debuvu.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/zexuzilomagagodowajubif.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/pekukivifiwo.pdfIn PDF document text
    • https://chp-travel.ir/data/file/24917515501.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb0801da9b9---binojarepodakokaw.pdfIn PDF document text
    • https://kede.org/userfiles/file/89319135862.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161083b3d16e95---18629688835.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e52027f74f---kapavurekox.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/426ce8c91ccef7d260da1bbd80bbe043/poxawedilotufaderetetotig.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/9026402516.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608446e43f7ee---16520557197.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1f73c7997---migapowopuju.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/32512227993.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/68537141176.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/wukok.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/11072415147.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/dipezekol.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/1532320418611891a7201a9.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD099 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B0 11356 bytes
SHA-256: 7d17073f992cabc7f33e4fd13a40a0e20b4b8ec30de196c0851c5f3411813a44
font_02_sfnt_off00010347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10347 23064 bytes
SHA-256: f8675b87451e980eda43a6472353563f7f105f1e1072e22583c99355109111e0
font_03_sfnt_off00013e23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E23 16244 bytes
SHA-256: fddcbe21bdf9fb2753729b4ab5b26d7a3fbb01e3fe51d41ab0725360e25c189d

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