Malicious PDF — malware analysis report

Static analysis result for SHA-256 67548af9e9f392f4…

MALICIOUS

PDF

87.0 KB Created: 2021-08-05 17:58:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 48cde88686b30415a7eb4ba54c7c3a8f SHA-1: 3b23db84de25264d8dbae7e61f3a0d57466344a4 SHA-256: 67548af9e9f392f4a01b37b7529b4990d34d00f47a8e1836cfc36c6a66286545
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or trojan distribution. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt at SEO manipulation or traffic redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071209d17c42---vefewero.pdf In PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b9bd5e3b06a---juregapopabikaluxog.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/rumilogorukefokamipeli.pdfIn PDF document text
    • https://kuepancong.com/contents//files/kulobudaxafinilov.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/bgsvt1ejii5kvij8kr9v19hooh/42841535586.pdfIn PDF document text
    • https://monocroma.it/wp-content/plugins/super-forms/uploads/php/files/bd4ba7307ef2a4aa1fe489d36b6b71fc/wasewimonuzifudulef.pdfIn PDF document text
    • http://olympusflights.com/files/files/70114807491.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/b4826ad1a7ebd6b1f24253272a35bf9c/dizepodidalijumadiva.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a76ccc6ba14---wisinonajatirasipur.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/latepulari.pdfIn PDF document text
    • http://beulahcooleycollection.com/clients/870349/File/vatijepunarobupajo.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/37737908275.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/3891d3eae826d4fcbfe6e3f0ef2a7c5b/7982436258.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/7d922d362266153db2aaed2e6196a42d/99618187741.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/kbqk6u05o5g2j4n90qvf7dimkn/riruzovawixorejorepevo.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/zikek.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/ad8c8213543c398827b5e648d6a5d8f4/34804393186.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/wotonotawijemabapisir.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/wakiromijujidumobitan.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a95257829---92785333649.pdfIn PDF document text
    • http://citra.cl/userfiles/file/93283482828.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c278424fe61---6038924134.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=reading+comprehension+worksheets+5th+grade+multiple+choice+pdfPDF 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_off0000eeed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10704 11524 bytes
SHA-256: d42946cabe8e8f680b7df627f796b38a2286bdbad663b7e1b778a1aab859981d
font_02_sfnt_off000121f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F8 16604 bytes
SHA-256: 56b6a9ab95880e907d7ca624ea41a3aac73f87c44abd45d101ffd8f8aeba69a1

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