Malicious PDF — malware analysis report

Static analysis result for SHA-256 e072c16807aae3b1…

MALICIOUS

PDF

76.7 KB Created: 2021-10-07 23:04:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 40fbc83e3501f46ccb87ebd50989c559 SHA-1: e9e05d23b6846b480e0d0d5159deb1d2751b1eb8 SHA-256: e072c16807aae3b187a8f6fb38d34f2a1f3baf4bff972b8ca4b34310cfa24941
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://laborke.ru/uplcv?utm_term=best+talents+for+balance+druid PDF link annotation
    • http://fabtur.ru/upload/files/31188459188.pdfIn PDF document text
    • http://wingtsunkungfu.ro/imagini_ws/zivexug.pdfIn PDF document text
    • http://www.superior-inkjet.com/login/ckfinder/userfiles/files/84314648717.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/dalifo.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/pofarefesatan.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/79859986447.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/4e72ccec603b3f1fdb3341b4b728e82a/12103425584.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/64839253768.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/18871165985.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/xuturofiporof.pdfIn PDF document text
    • http://lifecontinues.ru/images/files/bazajelotesafix.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/piwapogug.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/84479134457.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/lopumovumurewu.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/e92e79d324743b5bcfe55a7edba3aea0/72591614702.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1614d1fb7805ec---kobosajeliwaxateranew.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210909211933.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/26161028493.pdfIn PDF document text
    • http://domesticsolutionsagency.com/userfiles/file/fezogupominetowerad.pdfIn PDF document text
    • http://fpole.ru/sadm_files/tabamuli.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/88860919198.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/51833285119.pdfIn PDF document text
    • 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_off0000c44b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC44B 10760 bytes
SHA-256: 3f8695f8f5b67e44290fb727bf61627584f8f4d9b240ff9387b9688e07f7d9c6
font_01_sfnt_off0000dd33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF545 18072 bytes
SHA-256: 7ce5324fb1efe476c6b127d0a19885a24baa27a05aad1ed63095e7e5dfdf1993