Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0e1a69b83aca34d…

MALICIOUS

PDF

96.8 KB Created: 2021-09-04 21:09:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b9deafa3b2be8f9aa256310f29afe0ff SHA-1: a6986ed7cdde037bd1a342f2cacad2a21bb4a4ab SHA-256: a0e1a69b83aca34d8453fb0d5f4053800c51734c3cc340d08bb7dadd5c7d1a46
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://fullcolorspandoeken.nl/userfiles/file/xixiwir.pdf In PDF document text
    • https://maisonforville.be/documents/file/11822076407.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/busesetexozetazuk.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/45ee1231581e883f8a6db442c73eb27a/tezexamakebemol.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/75553518831.pdfIn PDF document text
    • https://atavio.ru/files/file/kuripapezinasuw.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/fd6d926245dc404528a738dd6028217a/70741631323.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/c4c17ed4a299d337f954f0a3c8ff74fc/revedipilujus.pdfIn PDF document text
    • http://deltastal.ru/userfiles/file/76094526491.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609262f56a0d7---natovovi.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160809f453c639---mewijiviroguzaxorasaviwa.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/62208338987.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/kevujutezoximazepube.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba83ba9768b---favigifivebipaxokijakox.pdfIn PDF document text
    • http://insei.eu/userfiles/files/91534097891.pdfIn PDF document text
    • http://www.tm-africa.com/beta/public/uploads/cms_filescms_files/jomuperodezipimolonasopo.pdfIn PDF document text
    • http://gitimohammadilakhimpur.org/ckfinder/userfiles/files/56321283007.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/jiwixajokebev.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/gijexoliranadasiriw.pdfIn PDF document text
    • http://devveb.net/userfiles/file/97609424806.pdfIn PDF document text
    • http://myexamadvisor.com/fck_uploads/files/vuwavini.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/gufuriboku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=download+ph%E1%BA%A7n+m%E1%BB%81m+chuy%E1%BB%83n+pdf+sang+wordPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE458 16716 bytes
SHA-256: 5d72ef517e4fc6e790dab8ec32d252efff387294c159ef0a77ea2f72fa57c2f5
font_01_sfnt_off0000fc0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001141e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1141E 27940 bytes
SHA-256: 108332ba685e09d48279f1ce514f828bbc195437c3227993f3bbd8176c0ee3a5
font_03_sfnt_off000157fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157FE 11672 bytes
SHA-256: 9eab1682bbc09c28874ccb8feebcecc8dc4cc99a4ba7cf0dace5221fd85d0ad7

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