Malicious PDF — malware analysis report

Static analysis result for SHA-256 00bd28ebe62fb919…

MALICIOUS

PDF

93.1 KB Created: 2021-09-06 17:00:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e0cd1ea3c4dac6de24c6d19006227c39 SHA-1: 5a302e16f006b52032336745e5b0da50b88e6bfe SHA-256: 00bd28ebe62fb919c68dc8157609fbdc1cc1a454a9016783c0274efc84c83d0b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, many of which are associated with compromised WordPress uploads, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing lure or a downloader for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/nenuponenelodijofagetexe.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608758d32e969---pefufivutibanumazomak.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/91461bd254e0a72868fcd644632e655b/xaxuzonukemufosugelatep.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2c77f46958---20178590990.pdf
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/s92aok6cahnd5gplcbg53jat74/54651043190.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16072be57f142a---11651726989.pdf
    • http://seghers.kr/data/editor/file/845532856117a20ee9a07.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160efdadf34a40---lagojarugubas.pdf
    • https://kenhquangcao.vn/uploads/files/1477301098.pdf
    • http://auto-spec.ca/fck/file/fonezobewifabede.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/cb8084957c53cd6772d09bb1b1a9ce80/57298596828.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/ab6428ec7bb65c2dab1decfba2945d87/lumovarowevow.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109652a1b066---bafid.pdf
    • https://olivier-daulte.com/ckfinder/userfiles/files/84887520012.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983d9fcc1d2---rowijodutigoxigi.pdf
    • http://fiumaradelsossio.it/userfiles/files/56414072180.pdf
    • https://saksisan.com/upload/ckfinder/files/nujewegabori.pdf
    • http://mosvag.ru/img/lib/file/xogumekitevaladepini.pdf
    • http://isvpro.com/custom/files/nulomevamuxoreme.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a848a9083---1539590614.pdf
    • http://hoanggiaphatland.com/uploads/image/files/kuvurivajisonotu.pdf
    • http://industrialdevices.in/uploads/17462155237.pdf
    • https://hantverksakuten.se/ckfinder/userfiles/files/sowapezowesimugutiti.pdf
    • http://villabrown.it/userfiles/files/96568305135.pdf
    • http://autosvanbeek.nl/mindcms/js/ckf/userfiles/files/ridazipepusutu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=ccip+insurance+cost+worksheet
    • 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_off0001063e.bin
e095330000bc6508dbcd760e3d5de25c22d9a4359227760f2a497b2b7b382ce1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1063E 10732 bytes
font_01_sfnt_off00011ef6.bin
194339fc7672c6ffc8bc7c04c967b1ecf6b7f2f992c72a821de59f62a5674406
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF6 18376 bytes
font_02_sfnt_off00014e53.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14E53 16792 bytes