Malicious PDF — malware analysis report

Static analysis result for SHA-256 f15f968d2c902056…

MALICIOUS

PDF

110.0 KB Created: 2021-06-30 08:28:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3247b61f38297eae1d100003d37086f7 SHA-1: 7cfab275c4d7892b72b8e5adf1cc4c0c8c2b5b69 SHA-256: f15f968d2c902056d00359a7f110351e3aee54fdf4869fd5dedd437f37da6f0f
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9756

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 http://technoculture.cz/admin/upload/file/vopejirutekomokotemu.pdf In PDF document text
    • http://olgapolyakova.com/files/files/57985059747.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/c52f5ef512f5dd3fdd8bcd575ddd0339/gagusubuka.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160915266d1863---nonawifalukulonirubepemu.pdfIn PDF document text
    • http://europartner2.pl/uploads/semijaluzezubufalejekibot.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8401dd04a---96199755767.pdfIn PDF document text
    • http://pauseforserenity.com/clients/1/10/1002a5d8b3740fc7390aa1937d1ec3ed/File/zufupuguferewuwumojutama.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ab255bbe2f8---8019449820.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/nujuwesin.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607234bdad4f3---50850702474.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083460e2a46c---fabezituxinatokegeri.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/b1bd51a3d0126feeed546c53c829b0bf/zinimi.pdfIn PDF document text
    • http://4bx.pl/public/file/fiwopozobazofamitip.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b31e9b23697---5553593934.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160c360cdaaf6c---faranopaxoxuw.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad7fd20d55---11631747959.pdfIn PDF document text
    • http://productosole.com/wp-content/plugins/super-forms/uploads/php/files/n3fknbd4n5pehkuh650nfmg2lu/3630592823.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607282fd6ee45---88391714758.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099393d7ae5c---xojazefin.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/90818564415.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/nusakojurixobub.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/1b8114b44da8c4c30417ae8b0c6ad9f7/73451806220.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf900850103---63870271771.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/xixogifidalegud.pdfIn PDF document text
    • https://efnnma.org/files/file/kalogivilijorisazerogawi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=gerald+the+witcherPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00014048.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14048 19660 bytes
SHA-256: 4328ea73270a67146b19643ae6c3cbed8630fe83752f7787fb75333effba00a4
font_00_sfnt_off000101cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CB 3932 bytes
SHA-256: fbf289e0040a27c2d7e83bb9ccc0e95269f525e490b12d5926381ac410ac3c99
font_01_sfnt_off00011132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11132 10200 bytes
SHA-256: e43a5289467a171c52892f3db6b09275dc6b46165891afded3570b8ddec7b134
font_02_sfnt_off00012837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12837 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00016242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16242 27432 bytes
SHA-256: 31db32a3baab901825bcaa13f912e700ee935ffa17a5685a476eb426e4604146

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