Malicious PDF — malware analysis report

Static analysis result for SHA-256 10e643c981014279…

MALICIOUS

PDF

96.2 KB Created: 2021-06-30 21:24:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 682880c2320af770fc7a3cd622524949 SHA-1: 40779aa472b9ed7a955f5a63a01a4fd4845f760a SHA-256: 10e643c98101427997a633c00d233bdaf10da4efb2db1bef1afc68dcdaa40655
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links to external websites, many hosted on compromised or disposable domains, consistent with a link farm used for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://aiswaryamatrimonials.com/fck_uploads/file/30228716786.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/573137d6da9833cc83d4c670413ea0dc/kebedabulufe.pdf
    • http://antoniolescio.net/userfiles/files/boloduv.pdf
    • https://sjalikave.hu/pictures/file/17252808431.pdf
    • http://skolicka.eu/foto/images/file/46887387884.pdf
    • http://vtvxm.vn/userfiles/file/69474291554.pdf
    • http://adaviestransportltd.com/userfiles/file/zorisivikipisilup.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3def615a2f---ruvejejidovapi.pdf
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080033cc7ca4---laxeg.pdf
    • http://geologicatoscana.eu/userfiles/files/dapol.pdf
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/adfb0d14a12e791a380ec1480825ba84/vedakupekufonuziwipebis.pdf
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/73fef0a7d4363de60dd05eead8af42c8/40987739554.pdf
    • http://avanti-kuhni.ru/upload/files/mopotivesa.pdf
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/kiputozodeje.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/a6607edf5d551d4f2d9660bc0531f6d8/ratumixanobikezi.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a258d1b42c6---vimojozoxenoxujatawumovi.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/abee0b923d541caf152c291bb1834577/11761317918.pdf
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/nf7445ud3iv5iicvik9ggag10j/12096669778.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c9498915b---relinejirafat.pdf
    • http://workcoop.org/fckeditor/userimages/file/20210605222126.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607654a43a1e2---95269684539.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/f41f39631ff0132bf1cbde841e40a288/99921449493.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16078d1b69cc33---gugalijuk.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=traditional+sweet+and+sour+pork
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4dc.bin
7733630bbe3c5929f9cfe8a84d96efd820ccd333fec75f6b98438c3c3a5f0c30
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DC 9640 bytes
font_01_sfnt_off0001130a.bin
5f2e879f475379811c560a0fc172d0ebbb8bc295f23fb09d00576fc79bb9b423
pdf-font-stream PDF embedded font (sfnt) at offset 0x1130A 19012 bytes
font_02_sfnt_off0001429f.bin
52286f035218448e4560d012394c57e4a35874d95f2a51b5b7ea94f8ad556046
pdf-font-stream PDF embedded font (sfnt) at offset 0x1429F 10624 bytes
font_03_sfnt_off00015b18.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15B18 16792 bytes