Malicious PDF — malware analysis report

Static analysis result for SHA-256 8be38a2790d975f9…

MALICIOUS

PDF

82.1 KB Created: 2021-09-07 00:58:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9d0d2f59ac967786b6572d5ddf079c89 SHA-1: fe14984f33dfa9acde2e2f9d00e1f33d5d709b22 SHA-256: 8be38a2790d975f9c121e17f7e4336f16a3aad8f169582f1e316407b0c1eade7
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://haithuanphat.com/uploads/files/salajotifipufigolepojin.pdf In PDF document text
    • http://lucann.com/Upload/file/88164043582.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210611035656.pdfIn PDF document text
    • http://lukinserv.hu/file/64337321107.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b08f0e3fed9---jejunoxepirisuvirag.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/45941562267.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/8oe32a1vu0617qec7u46r1jdvh/42275429450.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160b79f0579269---divizimijex.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/38f25a2bd641f915cbfddf2e3cd42d5c/gaxepuzipafu.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/tinezeduvojo.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16079bff205839---bejudu.pdfIn PDF document text
    • http://patroha.hu/file/tofukujoroxojuduzo.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/i6qnq4id8oko30dnt2gf9f5p0o/1616407036.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccc6b5f9f6---4681961861.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/87578864050.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/tikafabuwa.pdfIn PDF document text
    • http://ypperfect.com/ckfinder/userfiles/files/83023207255.pdfIn PDF document text
    • http://ilkemymm.com/image/files/sevaketagudofobunine.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/pisujolojesarero.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/eb56518bfd1e8a45b834f35776605a8c/vemiramewa.pdfIn PDF document text
    • http://tano-cable.com/d/files/susejonukebitomome.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/5168975941.pdfIn PDF document text
    • http://jr.ac.th/ckfinder/userfiles/files/28243825836.pdfIn PDF document text
    • https://havanic.com/cache/fck_files/file/78648501285.pdfIn PDF document text
    • http://smeclassof1987reunion.com/clients/37165/File/53364879165.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/fikix.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/6797259504.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=business+english+11th+edition+pdf+downloadPDF 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_off0000d7c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDD 10968 bytes
SHA-256: ab6e4c8c6c640ad847a025dd4e917f0afd729405aacc7783d6a1977b5a187048
font_02_sfnt_off0001092e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092E 18960 bytes
SHA-256: 8023bbc77cab17e577f9dd27999d36aba1654298d7da1799e15b14384cfc06c4