Malicious PDF — malware analysis report

Static analysis result for SHA-256 4acacc0e00e2c937…

MALICIOUS

PDF

82.5 KB Created: 2021-09-03 05:06:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c65c912fc0e9ec9b208b982433adb321 SHA-1: 43984ec95681742213c9159feb1d31bbcdf5eee3 SHA-256: 4acacc0e00e2c9371ea7a00cab59714b435447f3cfe5d8e07814f7d7780fdd89
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites and disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/7f1b731a4dbd1291e4beb598a67ec185/nexavobevinupojisupeb.pdf
    • http://supermarketdv.ru/files/file/14612327048.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f57e8ef6c3---47725165087.pdf
    • http://www.jindatunnel.com/up_files/file/tizigametitezuwi.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/a1ce5a10152c055dd70d1b876040a972/foxozarupizulu.pdf
    • https://dubaimotorcycletours.com/uploaded_images/files/soranunezuz.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/0a95ebad0e9533cd89ca15e2ad2a4a0d/ziwopotexujofosoxudiso.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3f1eccd6c---57559751760.pdf
    • http://lamekatus.ee/uploads/ckeditor/files/75233123026.pdf
    • http://s8radziejowice-paszkow.pl/userfiles/file/luvogina.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1837d59552---37709462781.pdf
    • http://artepcb.com/upload/files/vewuwi.pdf
    • http://eurekaelearning.com/upload/news/file/1575962085.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/cadad157180fb44a14c6da8a40468485/80826461138.pdf
    • https://jyapa.com/jhuoyue/uploadfiles/newixinurevabuvus.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/a6c9aeea9df4b387839870cac3c37041/82656914251.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e9866d04759---36889006877.pdf
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/21428051542.pdf
    • http://jevades.com/aircraft/fckimages/file/51629982888.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f8be398f5---72735516615.pdf
    • http://zimaletto.com/uploads/file/wizovowoligaxigugon.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/aipgsc30vphssdcm8dpflfc75i/15271261081.pdf
    • https://sanidom.pl/img/file/72343986737.pdf
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/4b7036204e0f432fdb2c4cb55ced9188/fevexivajurexikip.pdf
    • http://odessahighschool1970.com/clients/7/70/70263b1be1b93b62200e198143f59f20/File/38201075705.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=design+thinking+business+model+canvas+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_off0000d99d.bin
cd92bc467e9ab15de68b07a3dc5db6a40a1071dadf2f484b4fbd612ea34aab21
pdf-font-stream PDF embedded font (sfnt) at offset 0xD99D 18476 bytes
font_01_sfnt_off000109da.bin
fd9e9097f4db9d8825e41cee1f95ab1ed2a2f06decdb3d42202891681e6dda43
pdf-font-stream PDF embedded font (sfnt) at offset 0x109DA 11368 bytes
font_02_sfnt_off0001240c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1240C 16792 bytes