Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cb793e33af9a481…

MALICIOUS

PDF

77.9 KB Created: 2021-09-02 22:10:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8cd564554243604de3b5ecd2dc04e9a2 SHA-1: 1a19935499b9a10dd793361ee92b611fb16ba481 SHA-256: 0cb793e33af9a48198ead83708ad4edeb221d5846395f26620698121639b5d8c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URIs and the nature of the heuristics strongly suggest this PDF is designed to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca42070c1a---37160301709.pdf In PDF document text
    • https://rjpexport.com/files/441775269.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/nbs127lgneulinq15fnvtsktf7/nijoxexojelimitid.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/bukorari.pdfIn PDF document text
    • https://vayoto.vn/userfiles/file/60735127505.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608b22f4f2375---30027216892.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4ea808e912---lakudagoloxafutufi.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/fefij.pdfIn PDF document text
    • http://healthywithhart.com/res/file/ruxos.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/speg8d8g18fsr07v418qniipi0/vipokoled.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/joworanamal.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/18312868347.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16079af7aececc---guruv.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d6657d2f55---zowivevoluvizu.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/62592979729.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/97574884806.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5qrdt4uvnjupb06f9r44lf9b83/jusuliwalakigexonop.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/7ed277c402d99e7de61ec7a0e16ec2a9/lezavagejojixogegide.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/wuwopeguker.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c84fdf9927a---78182019007.pdfIn PDF document text
    • https://lecormier-menuiserie.com/www/upload/files/vonirujebagobejawidewu.pdfIn PDF document text
    • https://voyageaventurenepal.com/upload/files/52404387184.pdfIn PDF document text
    • http://sinoorchids.com/image/file/30572310585.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac812194878---10321463066.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=world+map+country+with+capital+pdfPDF 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_off0000cbee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBEE 17340 bytes
SHA-256: d6229085dbd65bcbd8e52e458004dd32e9c6088045dd692678daef81de278b89
font_01_sfnt_off0000f892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF892 10876 bytes
SHA-256: 39ab74bf120ae8270435b97fac01c5981f3e8953798ed620c6638bbf4b185746
font_02_sfnt_off00011186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11186 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1