Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9b20a3667a6b6d6…

MALICIOUS

PDF

76.1 KB Created: 2021-08-03 01:08:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a2803d00ada6c7232511b14c34298011 SHA-1: 3b7caf19fa33fbad26e53019b9b634dab1ce1df5 SHA-256: c9b20a3667a6b6d6a191586f99c5b6c06f0bb8f7f66d8ef0446ac308632a114b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classification strongly indicated maliciousness. The presence of these links suggests an attempt to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://puzynowska-kancelaria.com/userfiles/file/85539643155.pdf In PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aad0231ba9c---besasarewixu.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/mekokulanoxirelib.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/24326317372.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/zivafuluwaxugak.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091acdc15609---jejaripi.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d84ddd501fd---pewilerotewipisawuturikot.pdfIn PDF document text
    • http://4bx.pl/public/file/gigike.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16105520ed3daa---xotibulolozepazuru.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210626124611_j91ydc.pdfIn PDF document text
    • http://chsbicentennialclassof1976.com/clients/c/c2/c283bfa2537a82fb79a670aa087b4bd4/File/70671617433.pdfIn PDF document text
    • http://baominhlabors.com/upload/files/59257471802.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/urgleg2qh4irt1rqvvm7u0fqsp/rarupafuvuvu.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/xejokepuzizakimom.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/826dcd75072ec53afddf966bd85fc3d5/guxuxapabesevugeje.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/95529451597.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac99159a242---funoramixuruzu.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/25190059805.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/bdf42249c64b9220206ac2a48730bca7/78542447771.pdfIn PDF document text
    • http://mosjob.ru/images/file/zevewiwogivagakeniroma.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6cb67ee92---waxenuwezanepojarip.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/50029983840.pdfIn PDF document text
    • https://seitonsolutions.com/ci/files/26688118800.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/37258489485.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/pazizexewufege.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/bugadisomojanezuzeluvug.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608340dd0d7bc---wuzur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=bayapada+venam+di+female+version+mp3+song+download+masstamilanPDF 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_off0000c381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC381 11332 bytes
SHA-256: 8ab6d9ab9e8fccf9c101703cf6fc424ce1b75b3d6826dea86f95ac8765c2ec76
font_01_sfnt_off0000de06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE06 16496 bytes
SHA-256: 6b1be838d6785b4cb90392bda2b8861e6515fb2419c366ea3e59517640710f0c
font_02_sfnt_off0001091f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1