Malicious PDF — malware analysis report

Static analysis result for SHA-256 40f66e2501dc1022…

MALICIOUS

PDF

87.0 KB Created: 2021-06-28 00:16:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7a1bbe25cf3b9f2617b770d0c6277df1 SHA-1: 3d31aff5a29f213ae895073294648095a65c894b SHA-256: 40f66e2501dc102285c8ddf8c643ed55e9bc8aec821e9ecbbe4cb8c7998f5a4c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress sites, specifically targeting the formcraft plugin's file upload functionality. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt to distribute malicious content or phishing lures through a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077089a31397---zedadowobepumulopa.pdf
    • http://csc0532.com/userfiles/file/20210618050510_edfalu.pdf
    • http://homeopathyhongkong.org/files/detesudatofulediruto.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d316502a26---83205303058.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/3a53324777d94e2b9b9758785bee4267/22561441814.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bae5e316e49---sozivujefoteguketudunu.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a7824246795---remuviludufowubetufe.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160cc00531b76e---zokemesutaxopul.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086ee1b02290---setuvodopetoluz.pdf
    • http://rgn2u.com/userfiles/files/77280381646.pdf
    • http://alliance-ic.ru/uploads/file/vevipulogime.pdf
    • http://bagumul.com/file_upload/spaw_upload/file/20210516025644.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609461cce7f50---jugetiwixomamuxidugesa.pdf
    • http://haohanlegend.com/Uploadfiles/files/wufijipulurinokavuzadewig.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a745e47afc4---bobajuxetex.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16077a1c343be6---pamewovasire.pdf
    • http://chithanhplastics.com/uploads/userfiles/file/81008230191.pdf
    • https://arte-salon.ru/upload_picture/surozunejawak.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/b8929ebe8a56fc0c3d34fb9f7fa7a9ed/36972565839.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/a697ea7a7bb662702ff7a6e8c222b1df/dasomemexepu.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa14e8884c---93321773725.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/65d5abf0d24e6caee97c5a29eb16dd60/siwufaxa.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607f709c0154e---5324195747.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c1de6a43d44---40252456747.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=anything+for+you+mam+pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efce.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCE 16792 bytes
font_01_sfnt_off000107e0.bin
b7ec327646064e6564c4bd7ba832ec82e751a0d57ded1b3f7501f0af53343c2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107E0 17988 bytes
font_02_sfnt_off000136dc.bin
0742a557e8b5bdab6b67a0ffd89a696185e2fe4d8aa06cd36d2bdc7fab629c6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x136DC 10792 bytes

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