Malicious PDF — malware analysis report

Static analysis result for SHA-256 98a73ac9fb2bf537…

MALICIOUS

PDF

95.4 KB Created: 2021-07-02 10:51:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: b6f1d1bea09a5b849a8ddfeeff71d1cd SHA-1: 849f31539636010f8894a59c339ff80d7e12d364 SHA-256: 98a73ac9fb2bf537af8b7f284c5a2d0cca3d66dbd59bf8b5817d14c6e2cea3f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress upload directories, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered via spearphishing attachment, aiming to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/3c6e4d7685998b16678d0b4fcf27b9a3/11378109233.pdf In PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ef4fd5878---ziwepivulubologoruz.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b7e9abdd4---90614684364.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/6resefmsn1c9ln58t3v7jr7jk7/mobusotiwuzigeraj.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f6d7c35d5---kemuxejobosojejamojovi.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/1538206474.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/wobasofukonogevux.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/38696690762.pdfIn PDF document text
    • http://nfc.soo.jp/file/kinawifagapofonadivuwuzal.pdfIn PDF document text
    • https://memoservicesrl.it/file/tibilarapugu.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ade503a5d---zudagejesak.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607c06d0b421a---dapanit.pdfIn PDF document text
    • http://valeneighbors.com/userimages/perajitez.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607127d27af6a---kaluvisatutatiwi.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/4mnaes7l1r8ollel7qif1pqd3k/3891799352.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b11d4d1ca5b---mixamipepitotujutozub.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/simitilakewefebonuwid.pdfIn PDF document text
    • https://martabaktelor.com/contents//files/50111469194.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fef86c7a29---52836845223.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/954cc5b23f4512b7d603b631e2c81c6b/68782946324.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2be489497---fanujilagamufelexaka.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d21ad12ec0---30706650541.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-6///20216132353187916.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/ab4e7bbe696a18ec51ea950d30aa091b/87840103800.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=best+gynaecologist+for+normal+deliveryPDF 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_off00010f7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7E 17892 bytes
SHA-256: 63088a69aaeda51dd464ebfb6ca5dfdaf78f4e25a9bc767f0aacc709c0fd9840
font_01_sfnt_off00013e99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E99 11052 bytes
SHA-256: a9c20b504dea818b1522437dfc1cc1fa30067bc5c014ed5854c5adf72827d2e5
font_02_sfnt_off00015839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15839 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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