Malicious PDF — malware analysis report

Static analysis result for SHA-256 03595b5e91e58a3b…

MALICIOUS

PDF

89.1 KB Created: 2021-07-27 18:56:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 89f6273bbf2f3dbbd3a0b8241196b318 SHA-1: 0a1b78a639cb08e3e8057b0f7e3e8ad354258808 SHA-256: 03595b5e91e58a3b15b01520fb1919264be560565adc16e8230ed9fe3b5eb127
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to compromised WordPress upload directories, suggesting an attempt to distribute malicious content or redirect users to phishing sites. The presence of these links indicates a likely spearphishing attachment vector, aiming to exploit users into clicking through to a compromised resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c48370074---27357617551.pdf In PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a125ca16b55---xejomokonubodenupu.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/61951627712.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/62575907179.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1624757028.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c22e021d67---sigizake.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849ccf8f2ad---3314225869.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769212de2db---72009632496.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/powifoxaxifojelevogofu.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/2ff5ec7d26f71fcc08b3682c12827c0c/bopituvafanedotewuwidaf.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/podibamu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c74b6f0e02f---jupejenelofujamorurorevid.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e017e79494---45633500319.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/71033071854.pdfIn PDF document text
    • http://araonline.hu/uploads/file/78304043145.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c50ef35dad---jafaperogadotepise.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/71273286797.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc1eb090b3---xuzotakewuxevadav.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/33775086737.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/46314878199.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160851a719ee82---73364925376.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6e15161585b82342cb580bae79d1b93f/sebiredopijud.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/wurexipobaxebewerivagafun.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c79a0b94cd---76436651947.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/kiof9ktb3b0jts5c1jjgdnkrp1/99626985303.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=hayvan+%C3%A7iftli%C4%9Fi+e+kitap+indirPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AD 10900 bytes
SHA-256: 45d223204c4d70e22d03d70b48423f8c9277cbd498d9508f43e000b384997813
font_01_sfnt_off00010dc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC7 19032 bytes
SHA-256: 2ee662992ec9f8ddfb0d982e17b46979679e903a6a32789d51c76c27cc854e1c
font_02_sfnt_off00013c5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1