Malicious PDF — malware analysis report

Static analysis result for SHA-256 45d77417dd98e8a9…

MALICIOUS

PDF

76.4 KB Created: 2021-09-08 01:34:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c321ab738980b79770b2f9b566e661f1 SHA-1: 4303d8c3f7aafb28c8291d224d5d5eca96d8eddf SHA-256: 45d77417dd98e8a9d0e9135968e9fb46b2e6771f8215786252943b5d2b5f14cb
156 Risk Score

Malware Insights

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

The PDF file contains numerous external URIs and links, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of link farms on disposable hosting further supports a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://pistant.ru/uplcv?utm_term=endocrine+system+organs+pdf PDF link annotation
    • http://dh-cell.net/ckfinder/userfiles/files/15417450553.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/28282946703.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/sikukesob.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/4b0a650b64bc74518f549a90099d3a54/zetokevojewotupelag.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e6e7243b3e---gukepejije.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/zanabexaxotagefaxa.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e0bc6dc10---nimalolimo.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/14973943869.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/jajipavezetinawem.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/zirelulirapogexolunel.pdfIn PDF document text
    • https://grandmake.com/userfiles/78239407568.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160b84dbe86b34---79214441465.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c3dc56c55---97380880770.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/4b97e59816beb6ca1bd69d7037f99b6c/16224745763.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/72177469964.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/9213171127.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/11207160518.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/lulelutaj.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/94750941648.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161037347591ed---mipun.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/92405116540.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/c17020b23e353f089d8aecf389e5a334/55633000319.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_off0000c619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC619 11016 bytes
SHA-256: 872c3cde4f2c89d4dd391c2ddfb9f05544e82320a720e00554dfdaf3034f5482
font_01_sfnt_off0000df7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7F 17192 bytes
SHA-256: b764fbb6a772bd63189cd39b49b1a5bbf387c77a02352f24bf708cc79260fd77
font_02_sfnt_off00010c0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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