Malicious PDF — malware analysis report

Static analysis result for SHA-256 90d1c5c494582b88…

MALICIOUS

PDF

68.4 KB Created: 2021-09-19 03:11:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 7d2385065cebc478f3aceb03e23a0ee7 SHA-1: 2a7e38b652deea940bb8cf686b46e4c3a239d1af SHA-256: 90d1c5c494582b8856e3818f812949c69d8fb5e8552be9ced9e07fbc39c01ece
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the overall structure points to a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://garglob.ru/uplcv?utm_term=frag+hack+download PDF link annotation
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/9g3crdqget51u5l3mpcg21pb4g/80824057923.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/161449955f1677---gonudesamerenazufopelarul.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/xosipigixudavite.pdfIn PDF document text
    • http://labonguyenhoang.com/img-chamthi/files/53930453291.pdfIn PDF document text
    • http://terhautz.com/upload_files/files/60952154743.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/22571752527.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///fetewagategewifarumap.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/ruvuxukofomosopasila.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/dexipixunijiromaloriz.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/92480370479.pdfIn PDF document text
    • http://alarm.pl/userfiles/file/tefukero.pdfIn PDF document text
    • https://loyallcanada.net/editor_files/file/19718606911.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/c80a7b580b7a20c9eed39a05aad522f2/38022313164.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/e3cdfd9d9e9defcfc3f266bef4da5ee0/junamenoxujomadogusutesa.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/6483511327.pdfIn PDF document text
    • https://generalaudit.pl/eurostyl/photos/file/33875106926.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/58771734607.pdfIn PDF document text
    • https://newline-eg.com/userfiles/file/veworojikaze.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/27869741255.pdfIn PDF document text
    • http://www.psyforyou.nl/upload/fckeditor/file/lokaborisemusilofu.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1b40d8dc2---5455524503.pdfIn PDF document text
    • http://keacg.com/upload/files/pekoxakigumagejutexewilo.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_off0000aea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEA6 15360 bytes
SHA-256: 1188a863c1063d72776ea93708490c1af8a5da11fe319e539d6050af430ae6e5
font_01_sfnt_off0000d546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD546 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5D 10316 bytes
SHA-256: 8e5f192488fd303721ad5d889a233816ccdb3db73f26b9476f8d06527f1e7a64