Malicious PDF — malware analysis report

Static analysis result for SHA-256 a53256a66aecf836…

MALICIOUS

PDF

193.7 KB Created: 2021-07-06 22:47:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6b55be6227786f1a9882197d2f6be2cd SHA-1: 412d3e9826bbba2599693a3a4a9d851faadd2bcf SHA-256: a53256a66aecf83638063b1d84ebf7cc94d428df83c2853600e2af0ad80b9248
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites, indicating an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution through a link farm. The presence of embedded JavaScript, though not fully analyzed due to obfuscation, is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9575

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a37531c26---jasarapawubonawisirazuje.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/e212db3e6450e89a3db8fd09ad0c59e8/xinusaf.pdf
    • http://xboxheerlen.nl/userfiles/file/gerakuwuvozuxos.pdf
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/ea675aabe880f94d0ee5d8147eaea90d/zavog.pdf
    • https://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/64055487253.pdf
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/68109578057.pdf
    • http://scro.ru/pic/file/26547660035.pdf
    • http://www.buildingmalawi.com/images/uploaded/documents/18312971059.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/a1f0b5bbb57ff9fb44b5c3759babab72/davokozox.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160740510a544b---wugaxawefiriwol.pdf
    • http://heritagecarletonplace.com/clients/c/c2/c23aa4fb54f25340752d20cfcff880b2/File/pidozosoxozakapajek.pdf
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/72858be4d0ac998dc41bcff9532f00ec/15693743734.pdf
    • https://bd-sokolovska.eu/userfiles/file/kafuzovi.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb34c74914---pujufoxagerobuzujas.pdf
    • https://muguet.fr/sites/default/files/file/14272595913.pdf
    • https://alternativecarrepair.com/userfiles/file/61644832416.pdf
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/920dd8b398af43d58fdd7b9dd5848f5e/47883632685.pdf
    • https://fontaine-eva.fr/userfiles/files/99939939803.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/4b8694254b2bf8f1b5b82bb5dd4972f5/16113007414.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ce160f597---ruxobezixoxukerilabiz.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/pmvh2vg6hb2mmasvqjohl02peh/wibimewox.pdf
    • http://gymostrov.org/gymostrov/userfiles/file/57705888268.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=who+is+monotheism
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00023408.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x23408 16792 bytes
font_01_sfnt_off00024c19.bin
74936a4bfbdca0cf41d6b58630b9199570af2a76d3f633267aad7347fa9fcbc0
pdf-font-stream PDF embedded font (sfnt) at offset 0x24C19 19204 bytes
font_02_sfnt_off00026c3b.bin
68fbaaca7310a890c6bab251d83bb49d937a23136487aac152435ae983f028a1
pdf-font-stream PDF embedded font (sfnt) at offset 0x26C3B 10056 bytes
font_03_sfnt_off00028270.bin
59dd36ef6836527f9952b200a9e4bb4bf3dfe41d890f19ddb7a1c1549d40c169
pdf-font-stream PDF embedded font (sfnt) at offset 0x28270 17920 bytes
font_04_sfnt_off0002b6c8.bin
381d3c2d82707b7a16a1b63b5ed356ad28684e102e228fbc9c7c1a2c4ecec114
pdf-font-stream PDF embedded font (sfnt) at offset 0x2B6C8 28912 bytes