Malicious PDF — malware analysis report

Static analysis result for SHA-256 abd21eff96b41be9…

MALICIOUS

PDF

88.4 KB Created: 2021-09-06 14:16:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: aeab211e3ad9dccd2411cbb88422ed41 SHA-1: 3b3d2161dccdf0862cfca26b3ee21da2bc23147a SHA-256: abd21eff96b41be9b9beb5e8988d057f9058818572635228d96ffbd530964721
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://kerrya.com/ckfinder/userfiles/files/juginizabiz.pdf In PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/fadegakuvipovom.pdfIn PDF document text
    • http://countryclaim.cz/userfiles/file/40269141441.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cb62d3436bd---53252718090.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607acd19e7443---sibajisorev.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/78775915532.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/fepogaxux.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/nudufowevogaj.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a86bb6c0ae5---jafawizipofebi.pdfIn PDF document text
    • http://xedaphcm.com/luutru/files/xatukufetavipotux.pdfIn PDF document text
    • https://vcvscr.cz/www/www/fckphotos/file/9063282542.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/cf3b41475c8aa5a5be98039ed0f56be1/setixakape.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/pofajesodevenozupij.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d71bc7d525---dozamawevimokegidi.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wolupakefijixinox.pdfIn PDF document text
    • https://tidaksusah.com/contents//files/5886884974.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/66128027877.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/xoxosimudemasazulimuwe.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/mifotupelaxepilabexowe.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/80126289684.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/mh5p7id742eakgtdhne9oe9257/60213914417.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad56870f778---2071814347.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/75d6f129ffe6937e132c4ffaf7801dd4/6049381252.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bc2302d24---58698816726.pdfIn PDF document text
    • https://c-effeimmobiliare.it/file/bajesemupibefobadazunil.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/xugapipigepegubupidatu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=the+handmaid%27s+tale+livro+em+portugues+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_off0000ec74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC74 19748 bytes
SHA-256: c12eb9fbdeb9c37c7296e2116356f3df78b124a3d9032785fbad6ffe67e3d1f6
font_01_sfnt_off00011fbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000137d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137D4 11108 bytes
SHA-256: 7da1666c8822838b0627e4935c379fd911315e8adf62b28d76d7b308f485dbbf