Malicious PDF — malware analysis report

Static analysis result for SHA-256 adf401fdc90c3e2f…

MALICIOUS

PDF

124.9 KB Created: 2021-09-01 19:31:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 91649f8d7e86f57872b0cb8578ebc582 SHA-1: 8fc6c2639ff997b9c649fc3350539e033b7c0297 SHA-256: adf401fdc90c3e2f78aef38b7af9024f42ed7bca46bb80f0399a501b82e6d2ed
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm or SEO poisoning attempt. ClamAV detection and ML classification strongly suggest malicious intent, likely to lure users to phishing sites or download further malware. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afba0af2e6f---42229411532.pdf In PDF document text
    • http://hrjok.com/uploadfile/file/46500035174.pdfIn PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/20768653569.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749bdb5d107---barofejodobekaf.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160870c0d77d0a---vafulamowomanuloba.pdfIn PDF document text
    • http://alwaditrading.com/userfiles/files/80320225550.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/4537405122.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9eede5369---42039929425.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/fa05061ec49b565683e7eba9ed5848e5/82710293749.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/4326f9cb84daf6a432a89706c9ac8ca1/doragiwoxijamikirimu.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d48d4b5ffa---tajigekepirepe.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/86481370069.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/tuuchsqbpj47llllrkcn886j54/zoribaxujusoxupesibo.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///zepivuvexigurexal.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609427380d831---74386366273.pdfIn PDF document text
    • http://mospolytech.ru/storage//files/wodiwesulosupitenitik.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/18207039337.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ca0f27720---59514354209.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/1c98a2f0c71f96925d7c4106cda49496/95777921380.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/50817799303.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents//files/veruvuwixox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=computer+organization+and+architecture+morris+manoPDF 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_off0001813f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1813F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00019956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19956 11104 bytes
SHA-256: 7064d36b236bd9cea164c0515581f0166f35a74f3191dd856299e8bdcb97a743
font_02_sfnt_off0001b2e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B2E6 19404 bytes
SHA-256: 46e7069d23c9fb95d4bae137789f33c9e877d7fa9c46f62f3a2a386c0fdfa24e