Malicious PDF — malware analysis report

Static analysis result for SHA-256 6181dcffd22bebaa…

MALICIOUS

PDF

69.4 KB Created: 2021-09-30 20:34:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: adcf76a776c670c7db9399726c832cb8 SHA-1: 11aba45566f658e36fe618cf33e83ea44162db2a SHA-256: 6181dcffd22bebaa687e69e982e6983693635afcc8719baca8baeb399f1dab63
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites used for hosting malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL analysis suggest the document's primary purpose is to lure users to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135e7f0bc991---lojufodipexi.pdf In PDF document text
    • https://festival-bg.com/media/ckuploads/files/zorukowev.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/viwikisivut.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/96611671034.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/dopupusume.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/d94d6428bf3a54634b4e0e24ff548ce6/disapexevobivaxaboro.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/kojidisun.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/80810018675.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132734283e3d---54864564933.pdfIn PDF document text
    • http://www.extramas.com/userfiles/files/97982151631.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/samufarefanoz.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/10555733556.pdfIn PDF document text
    • https://phunhai.net/upload/files/raxulososekinixagowijofew.pdfIn PDF document text
    • http://nenorm.com/files/files/musimoruvebukepuvu.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eec00ece03---kolubimexolipurul.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/jolulekepepibadiv.pdfIn PDF document text
    • http://gysanya.com/upload/file/210928015317764062lzd6l3gimymg.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/63068172225.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/pefipituxurelete.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/58230632365.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/kemodonakujufigajiga.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/86720207841.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=pokemon+tower+defense+playPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/96338181298.pdfIn PDF document text
    • 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_off0000af2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC741 15592 bytes
SHA-256: 4d8c08a1d6e07aa0f69dc1d22558fab5dc34aa58cb520074f22e65308406e613
font_02_sfnt_off0000eefc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFC 10860 bytes
SHA-256: eef9d86d0332faccd5a2200a9434f6764180a6c537a983304f3a762bdbe90f19