Malicious PDF — malware analysis report

Static analysis result for SHA-256 db649e0d0ee80bc3…

MALICIOUS

PDF

98.8 KB Created: 2021-07-14 04:46:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ad8fd7736d3b94f7bf7413934d23357a SHA-1: cf502b83fd9f73486671118685ed970aa0705ba3 SHA-256: db649e0d0ee80bc32fbf864e695b294e7a2559ec991b2354620db5b2a50f6f4b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to compromised WordPress upload directories, suggesting it's part of a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9862

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://wastran.ru/uplcv?utm_term=utmost+meaning+in+tamil PDF link annotation
    • http://gesundezellen.de/neu/userfiles/file/4484922611.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b337c8e10b---lekufufujolaravomodowi.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cccf80dddd---nanasepojaxalovidisuwu.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/fivejurogopom.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/c6tnjs8b6ipgojsspue57tia8a/60003472866.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082710218a09---15773128715.pdfIn PDF document text
    • http://jogforbigt.com/clients/6/61/61f7a61d17da296148a50ccd59c4a139/File/43414907873.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/42512287844.pdfIn PDF document text
    • http://www.climatisur.com/ckfinder/userfiles/files/3194045759.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/3034436f3782a23b8c3266b9557cd9a3/viwukofuturufik.pdfIn PDF document text
    • http://holzbau-napetschnig.at/82591664747.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/ir5c6u1vv47k8rea60sl2fq5vr/folugenefanupaxi.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/bumositoguwi.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/e8c5e8ca0517e0f9e7897b10e3fe2ba1/11649074584.pdfIn PDF document text
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/83089671718.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/satujowofezof.pdfIn PDF document text
    • https://baongochoa.com/upload/file/9891611349.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf32a9940a---93160875704.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/acefc97741e3c8858bf7decbd6815aee/29166835146.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/48897630804.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/nidofepovonugipulelulujim.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000d88a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xD88A 19676 bytes
SHA-256: 40ddea819caf331b98da3f6f970d731e717104efd146b6e47f3e986e3b49748c
font_01_sfnt_off0000fa13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001122a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122A 10356 bytes
SHA-256: 6b33a5e784a93d417747c03d972fd0c8f4c8a097caecd5ed760556989b899c6e
font_03_sfnt_off0001298a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1298A 27300 bytes
SHA-256: 3dd74c1dde7ffe3fb0bbe49b44805d555d83292c6715d36feeb6f136f4e1c9bd
font_04_sfnt_off00016bd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BD9 4244 bytes
SHA-256: bc5bde7809f311d705960b497d9576ca2068991ce0aa54463ebbcdedfaa8ae66

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