Malicious PDF — malware analysis report

Static analysis result for SHA-256 65b3a946164a474e…

MALICIOUS

PDF

83.8 KB Created: 2021-09-03 20:23:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 51a615136226c61a528e1c24cda07eb3 SHA-1: d80d8e17aeb1d65c8d185c1343fe4d12656830eb SHA-256: 65b3a946164a474e8fc34d5dd1d9a34a7da9e19fca4f8c92ba78d01f7f94197f
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://mygoaltv.org/ipp/images/uploads/files/mutipuzu.pdf In PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/18863604946.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/ek1op7fitjere7k11vrbf0gk84/batonabatofaporapema.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/04s0geb73iktgpo50u47oun483/72106289692.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/5937882426.pdfIn PDF document text
    • http://jerilyndavisrobison.com/clients/870655/File/jetojemabif.pdfIn PDF document text
    • https://tiemhoahaibara.com/data/dulieu/files/kivurasogugoxajod.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/9bf530cd526a64af6c8502c6bca5b899/73567554576.pdfIn PDF document text
    • http://dogninja.com/userfiles/files/zenudanixevidujob.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/girelidabolimo.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/87712426374.pdfIn PDF document text
    • http://24cvety.ru/upload/files/56399808928.pdfIn PDF document text
    • https://coevent.ru/upload/files/8557430804.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ad205a1e780---24698304050.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/rozitijexibuzolimed.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210623221839792887.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16083b87538b79---73896465978.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b8104859b---33347659628.pdfIn PDF document text
    • https://charming-dc.com/uploads/files/202108191017456357.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/go1qjspdn61k77aak8ka9sv78g/75241769157.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a78b26d2764---49681831314.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/lk8fpre60k037nirled0r2kgn4/mepuvunufovatesuzokafenin.pdfIn PDF document text
    • http://marymo.ru/uploads/files/92281351714.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=cooking+recipe+book+pdf+free+downloadPDF 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_off0000e559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE559 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6B 16844 bytes
SHA-256: 29e9625cfc58e088d671c38ca4378a08708b14c6d49afc90ef057f73ae867cb7
font_02_sfnt_off000128e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E1 10880 bytes
SHA-256: 77a5b2ec1b9cefb8261376f360418b07978f0632701cebd2c886a732387f6593

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