Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6d0453f12ccde52…

MALICIOUS

PDF

85.9 KB Created: 2021-09-22 14:06:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0a65749199714a30d20fd97869d3922e SHA-1: 727fe5e416333e092f2ff37aa4180001d8745cba SHA-256: c6d0453f12ccde52bc9f742d2fc29582acdf2216b821afec60e34d3c51d382d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous external URLs, many pointing to compromised CMS uploads, suggesting a link farm designed to redirect users to malicious or phishing sites. The presence of embedded URLs and the nature of the heuristics indicate a phishing or content-luring attack pattern.

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 https://pistant.ru/uplcv?utm_term=cheat+codes+for+gta+san+andreas+android
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc7b5ef8f3---98749176149.pdf
    • http://inbjnews.com/data/cheditor/0603/files/puwajagewifixapasuxiga.pdf
    • http://epicridesnepal.com/files/54060646414.pdf
    • http://geraldinekilkelly.ie/waxefisewadejenavok.pdf
    • http://goldenteriyaki.com/uploads/files/xidawirirolipixetido.pdf
    • http://struttur-arch.it/userfiles/files/43399385035.pdf
    • http://mertcelikkapi.com/userfiles/file/nufevakusurifax.pdf
    • http://doubler-son-capital.com/photos/files/vatuvoxepebak.pdf
    • http://sitoad.com/bbqjoekey/files/202109050943192628.pdf
    • http://sys-svinding.dk/userfiles/file/68915687181.pdf
    • https://minlinart.com/archive/upload/files/13008104271.pdf
    • http://seychelles-resort.com/images/blog/file/winilusasisitameromotes.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132e890f1810---gegur.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613cdcefa3327---60867488161.pdf
    • http://epmresearch.org/userfiles/files/4204513145.pdf
    • http://yarpb.ru/pic/userfile/70583456385.pdf
    • http://tsradviseurs.nl/mailing/images/photo/file/36813591879.pdf
    • http://saovietgroup.com/upload/FCK/file/lazegivamufanalu.pdf
    • http://mexvp.com/ckfinder/userfiles/files/61360636724.pdf
    • http://vasekurzy.cz/userfiles/file/petagowojofudajodupida.pdf
    • https://dewalt-naradi.cz/media/upload/editor/file/zuserejekazinoxemij.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161308fdd054e0---rujunidojog.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/7f583jk61pg4933rpn6kt7ic76pupvk6/98805226726.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/64e982ca2fc56ea541108d9f86b7aa99/jagorokuxufavadaj.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_off0000e992.bin
54b9682141da5b74aa43e32b69e7dbedb67aa454dc82326aacd87d9a8f0e9e24
pdf-font-stream PDF embedded font (sfnt) at offset 0xE992 10740 bytes
font_01_sfnt_off00010206.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10206 16792 bytes
font_02_sfnt_off00011a18.bin
fbcf60bb68d1d7d84c17df5ee3bda948556da28640e208dd667e4a4237c4f43f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A18 18348 bytes