Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2fdf10fb42373df…

MALICIOUS

PDF

80.2 KB Created: 2021-09-15 14:03:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b36e7c1d8a839efc9a81af4bc4ad90f9 SHA-1: 93a9b9972a19e38cfab1fe7b3828e24295c1e136 SHA-256: a2fdf10fb42373dfac37892c13d8cbee1d26f9bc9ea1b4f56d39dacb8ddac760
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised WordPress sites or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings clearly point to a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://vpecargo.com/userfiles/file/gaxutelunapiwoti.pdf In PDF document text
    • https://actorconseil.com/files/file/zebolopegogitoz.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/27493667317.pdfIn PDF document text
    • http://canshu.dlzj.net/upload/files/20210904181424842509.pdfIn PDF document text
    • http://goang-hann.com/uploads/files/202109022248327224.pdfIn PDF document text
    • http://kanizsakran.hu/userfiles/file/xuvokufidajiwawupeg.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16141a088aa767---19998617286.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/jomug.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb5dd2f2b6---97916435189.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352e12b7431---12361996998.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613df0301f4b8---sebarokexi.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/dekudoponefawitew.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/e95c12e938179df8ebb5859e90b9909a/43184310783.pdfIn PDF document text
    • https://anfauglir.com/images/file/92948592942.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/donefagifosukiviton.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/66390571221.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/zewakipekadesixilos.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae1565c539---70384613613.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/39985496802.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021090921483982.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/56876437290.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/didamiwok.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9aadd5c46---31713816480.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/zerekogemareme.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=shreemad+bhagwat+geeta+pdfPDF 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_off0000d5d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D3 10716 bytes
SHA-256: 369d29e3c8638aad061f183ae5b13368667b8f022dfc224399248cb32d8255bf
font_01_sfnt_off0000ee1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1A 17168 bytes
SHA-256: 2401376a158299951d39b654745f83e697d73f1879b21a381045222e6d1e2e8c
font_02_sfnt_off00011b0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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