Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc1752e0f4d215ae…

MALICIOUS

PDF

81.4 KB Created: 2021-09-02 07:09:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8982ad21ddafe7423093637cc5e5ac29 SHA-1: 5945c9202f225af9fc696a01df4f8d46964c2656 SHA-256: bc1752e0f4d215aedb921e4fa074c3e97896082913d4bd39b8c20a72801f8b9f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish or distribute further malware. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/bsamegogevqegtj9l7e4vdq566/fulikinukikijoned.pdf In PDF document text
    • https://agrimal.pl/userfiles/file/dewipivumujag.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/menimenupagofuvesapulip.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/98902667964.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/44905584047.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/49373922198.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/djuq5dp52gp7ptqvkboifvc1oa/57695093377.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7e20eaad9a---faxesi.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/7efec1c24f8e9b87d20f49eefc6463e0/93130417427.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7921e5dc1d701552f6ecb5e36c240a80/sowigagopeniwuv.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/fulikuk.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/rokepe.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16078ec4e7ba46---34541804842.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/diwadepitopapebod.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a35cad657e5---wejinotomikogujo.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/6081104072.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/8c621e19896b85e3b790eb1123d73c4c/66086435299.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/baribiropoge.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823bf7adb49---ripelimar.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/fajunaburalamorodewaf.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/butaje.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/vipusegid.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160843f8bb90e9---55470629687.pdfIn PDF document text
    • http://grandchainfamilyfoundation.org/clients/85333/File/kevorezaxovezitovo.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16070a63b81a3a---jiwonarotodegeve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=male+gametes+and+female+gametesPDF 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_off0000d903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD903 17940 bytes
SHA-256: c43bb393b2a16a24bced9b5a50f7ab536d9bc87fcf0db3b8012e304bc8373a24
font_01_sfnt_off00010793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10793 10376 bytes
SHA-256: e5304aa7d5503cacf2083d30b0a567fcbbad53ed3e6a49a0bcdb78beb52aad01
font_02_sfnt_off00011ed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1