Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb6ef11629908386…

MALICIOUS

PDF

205.5 KB Created: 2021-07-20 03:30:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3ebcb57d1a9376eda96ca28ab6aa52f6 SHA-1: 584af7f58820ba8a235b93d140cb4b9f91cbc928 SHA-256: fb6ef11629908386ae282103c9befd9e2e5e7eaf37a59677d0667a0604f17e28
174 Risk Score

Malware Insights

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

The PDF contains a high-severity heuristic indicating it uses an SEO redirector with an image lure, disguised as a "free download" opportunity. The ClamAV detection and ML classifier strongly suggest malicious intent. The document body is heavily obfuscated, but the presence of multiple external links, some pointing to compromised CMS uploads, reinforces the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/mug39co46msd4r216kgopm6p67/1643643761.pdf In PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/0a1636c230ff156d8d1595975e4d6998/puzurivivelibelutorivo.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/b23cv16i6tadh6jv95089tee53/posato.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/dipobijofakup.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/97648651753.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/34336315790.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/38903918667.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202107071037582421.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783a76911c5---25938920109.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/cff78852e3668fafdf8dd08363c2862b/jajaxubegamesarij.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/pivono.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/28277682132.pdfIn PDF document text
    • https://bfull.ru/uploads/files/226024390.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160c68db3dc6b2---dunokobi.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/mdb2n1ik34fb5pcvah20jt94f3/vifun.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b726b5c6453---mabafusotuvetilejajaf.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/35910618376.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/5124426872.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/27977389918.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/88mnh8iha5jqk4fh3dajoqh8p8/14054764138.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f16ba0165c---2011729441.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/dd675a2bb20a03fb0658f0d88a6265f2/10426931136.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=easy+notes+of+physics+for+class+12PDF 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_off0002beae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2BEAE 20864 bytes
SHA-256: 8d4a404ce28ada6a9c4ce549775d5d2b31dbe01136e9caae38ef6f0d9eb3a315
font_01_sfnt_off0002f6f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F6F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00030f0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30F0F 10844 bytes
SHA-256: e66ec4cf6b5a0fc9208243403b2869e33a4019cfd698f2e036fa9e030177350c