Malicious PDF — malware analysis report

Static analysis result for SHA-256 007eac31ca1ac346…

MALICIOUS

PDF

85.3 KB Created: 2021-09-13 10:50:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3073009ab95f76b79e532f71fa80beee SHA-1: 032ddab5acef17b0ebc3163a9567b00afe0f3e0c SHA-256: 007eac31ca1ac34610a49c024324609f9e95991f8d151d24bad454ef8daf4cee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document designed to exploit user trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://garglob.ru/uplcv?utm_term=ielts+graduation+student%27s+book+pdf PDF link annotation
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161392351ea965---fobixizitibajinori.pdfIn PDF document text
    • http://citysoupsbellevue.com/uploads/files/48393565870.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/51867424406.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/77289257047.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/61586835993.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/notidorupudode.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/5f9d5bfb969bf2f3f39e68118d1ca11d/75752644372.pdfIn PDF document text
    • https://seger.cz/userfiles/file/kexidibabexuzimo.pdfIn PDF document text
    • https://sanmuabancongty.vn/images/content/files/19289387360.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/vijazalikewedosamaximefew.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/vamabegakukewelexolizedu.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613407148d543---sogotevunavumanafe.pdfIn PDF document text
    • http://about-dogs.ru/upload/file/84824272532.pdfIn PDF document text
    • https://itchanoi.vn/uploads/news_file/pakamajiroxif.pdfIn PDF document text
    • http://tw-jia.com/uploads/files/202109081229056221.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/42698971960.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9b60998ba---55443055906.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/71752245336.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/jojatasibum.pdfIn PDF document text
    • http://bilcafe.it/userfiles/file/sedegedifofuzufodumuke.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/12818284049.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210909_A801029983E3F161.pdfIn PDF document text
    • https://jeanmarcrobion.fr/userfiles/file/26427201682.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE802 10992 bytes
SHA-256: c22b7fc412cfffd91276be1267296197b6beccfb0a47406f5a82be5d55c97bc6
font_01_sfnt_off0001013c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013C 17760 bytes
SHA-256: 2c17b01854164be74c39a6cc6b8b3134fbdf4231610199e526f7a40a47d70924
font_02_sfnt_off00012f5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1