Malicious PDF — malware analysis report

Static analysis result for SHA-256 617a8a028e0ad149…

MALICIOUS

PDF

70.8 KB Created: 2021-09-20 03:55:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5e9997c1ab36b4492b355a057b4d1f19 SHA-1: 94d60db611e016f389c30d353e7980d788b57d33 SHA-256: 617a8a028e0ad149279f6ab4873e88fa1086830b8074fee263bf264328498031
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://philabc.ru/uplcv?utm_term=home+design+3d+unlimited+floors+apk
    • http://viettruss.com/upload/file/47172128823.pdf
    • https://s-h.cc/uploads/files/202109160432203794.pdf
    • https://maconlux.lu/userfiles/files/wibisesesalobazomofos.pdf
    • http://adamex.ukrkarta.ua/fckeditor/userfiles/file/65308825577.pdf
    • http://es-iyashinomori.net/yamituki-n/uploads/files/gitepevepupefexipo.pdf
    • http://hzeiger.com/userfiles/file/tinanaxejonizi.pdf
    • https://moveo-sport.pl/userfiles/file/zulakubakikivifulet.pdf
    • http://nattukoottam.com/userfiles/file/44571412221.pdf
    • http://hnfhdc.com/UpLoadFile/2021091808570820888.pdf
    • http://gsnursing.in/ckeditor/ckfinder/userfiles/files/tunofaz.pdf
    • http://ehomeforeclosure.org/images/file/newenijej.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/c13a835d628b9d723232e7cac45f64db/33663008370.pdf
    • https://shturnev.com/files/foFKED/file/88560152686.pdf
    • https://myparrotfood.com/user_files/files/daporejulinekev.pdf
    • http://studiolorenzino.eu/userfiles/files/pexutirora.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161358845e535b---dewasodorubaxuxaxi.pdf
    • https://rireenfrance.com/images/upload/files/55439297915.pdf
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/virugisibilizebosifatob.pdf
    • http://mwflower.com/upimagesfile///zowobefefevov.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb7e783874---69881840341.pdf
    • http://www.moyekolodin.com/files/xomawaxu.pdf
    • https://kisikana.hr/userfiles/file/11069565353.pdf
    • https://creativekids.abcedukacji.pl/web/uploads/files/57840772938.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161319b650b697---93638001684.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b621.bin
35b8ff69614a7f1a6e8a267f1d7ca82c7df5a59c0076ed44f25213249edd7e57
pdf-font-stream PDF embedded font (sfnt) at offset 0xB621 14736 bytes
font_01_sfnt_off0000db68.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB68 16792 bytes
font_02_sfnt_off0000f37f.bin
44638cdcfd34b8ff7e1e974fd869003b90aaa7750cf15d2f9a349742493afa85
pdf-font-stream PDF embedded font (sfnt) at offset 0xF37F 11196 bytes