Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fba697ab23733cc…

MALICIOUS

PDF

103.4 KB Created: 2021-08-21 08:04:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 99326d0cf00ae8850c3308b25d489d29 SHA-1: c8f14bc36f9763d7ce11cac374d77832e912f0e9 SHA-256: 9fba697ab23733ccc1447b23232d2e210f00a67ca05d045d30ba770c99456633
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of links, many of which point to compromised CMS uploads or disposable hosting, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9549

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://elite-weekend.com/clients/9/94/945a7f92a07ecc721aac768ad340748a/File/1054098800.pdf In PDF document text
    • https://drvishweshwari.in/userfiles/file/ritonevafajiliwi.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfce9c08f4c---wibozivolusek.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/parijakunopadonijotot.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/a56e6094fb6185cb78a88088b242f495/koxawezeved.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bac04c6f2f5---17531579243.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/ba7aj5csfvfodqq6jffucg3jro/pirumutizidewunekito.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/84626fd765878014e88f5114bd439d9f/kajunomoxoj.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/5b198f9026a913563f6eb1c627d18a65/mesebezawanar.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/d35cb738cdaec1e8f42a14864cf7de4e/93127709219.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/7eeb68cee675e930f654c5e3bf8b911a/daropovuf.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/kilububizibukoxipixaku.pdfIn PDF document text
    • https://samudra99.com/contents//files/lupixomegikidagipu.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7b64b85374---2716979242.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/99450918632.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/moligumufariwazezu.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/gubutodijun.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdca31fcdd---kuruvimawosisutibalur.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/f0842329a7b6e7d5b293a655d387d871/sebomo.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/panumevixem.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210625_6561F567097050D7.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b0a0f0918---gufekonevew.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/bubkeian076ln3usmkrper9mci/73368027.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/f041a42a254d53d4823a89a82bc2abe0/81885408289.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/44903546114.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16087e3c723ab6---vubaxo.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/fasubobaketazubusuredixob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=schedules+of+reinforcement+worksheet+420PDF 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_off00011420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11420 11252 bytes
SHA-256: e9b43fa18accc68943f3a121c980c6f4a7237e3bedd4d8b45b0543b1be3bf250
font_01_sfnt_off00012e75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14686 16488 bytes
SHA-256: d0e02ea597b059e12c640018e4c0b859d2fbe31b167f59dc9fd0dc6423c65742
font_03_sfnt_off00015d6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D6E 18344 bytes
SHA-256: 0b8a4324ef2f10d07970ae69f21078ff4d8692756d6978fa16d06caeb136d6a4

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