Malicious PDF — malware analysis report

Static analysis result for SHA-256 36ae941a515e9500…

MALICIOUS

PDF

85.3 KB Created: 2021-09-16 07:42:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f626b25c3e4430122573f44131b1ffba SHA-1: 86a2890a4f4b29900ec125028eca1c8fb96adfd4 SHA-256: 36ae941a515e95004f1291d6306f6b278cb0576d8759502899349ae6724bc709
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to domains flagged as link farms or potentially compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure and URL analysis suggest a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://komputerzagrosze.pl/userfiles/file/tebedejetadimuzazewerek.pdf In PDF document text
    • https://justforjetscatering.com/userfiles/image/files/23750971120.pdfIn PDF document text
    • https://photojet.bg/userfiles/file/92585027089.pdfIn PDF document text
    • https://hideab.se/tc/Mediagalleri/file/78973109129.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/90674710979.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/83153387631.pdfIn PDF document text
    • http://sino-web.net/filespath/files/20210902225120.pdfIn PDF document text
    • https://jeevadhara.org/work/london/userfiles/file/90974707329.pdfIn PDF document text
    • http://stl-hk.net/userfiles/xofovoridul.pdfIn PDF document text
    • http://imbirimbir.ru/files/zomulop.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/83783520692.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210905_05981D9EAEFFAF34.pdfIn PDF document text
    • http://tuzoltosagmihald.hu/userfiles/file/84008635081.pdfIn PDF document text
    • http://neuchina.org/userfiles/file/85860939996.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/d8eb8e7c78d6c8a656ed0bcd8c4da335/54468397199.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139f6ac5524b---18141464277.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/14341895253.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109021120525386.pdfIn PDF document text
    • http://xmzhj.com/UserFiles/file/fifoxezebuk.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141832e88c2a---22500066932.pdfIn PDF document text
    • https://comillaspostgrado.es/userfiles/file/19588080200.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/junexanugibutupatera.pdfIn PDF document text
    • http://fatimaartwork.com/userfiles/file/46883788645.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142c7524b0b1---genepepiri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=hbo+go+app+for+androidPDF 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_off0000e954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE954 18056 bytes
SHA-256: 0d3a2fdf291afa205591822d67b1d8606ebe7905b5486c400250d464c1f26acb
font_01_sfnt_off00011846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11846 10360 bytes
SHA-256: dcdb0810b1ab5901da804ee50dc4b546ed5eaf35fb793d0ed1746343bdb6f26c
font_02_sfnt_off00012f42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1