Malicious PDF — malware analysis report

Static analysis result for SHA-256 13aa06514010981c…

MALICIOUS

PDF

83.7 KB Created: 2021-09-20 05:16:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2ea44a63b00d2dabebf9984add5c0b1d SHA-1: 526e13abcef97565b623836700e4fd40f05cc116 SHA-256: 13aa06514010981c3a8d60d37d48bdce70d5e64abb345a6150ced105ffe680a2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external files, many hosted on compromised or disposable domains, suggesting a link farm designed to distribute further malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. ClamAV detection and ML classification confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://floridadressyourhome.com/uploaded_files/userfiles/files/wuvole.pdf In PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210902035850_MzY2NTUyNjMyMzA=.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/dasilalovunafe.pdfIn PDF document text
    • https://andhimazhai.com/images/files/sisusanekapefekebanepu.pdfIn PDF document text
    • http://www.520amis.com/upload/files/36678161727.pdfIn PDF document text
    • http://volker-issmer.de/userfiles/file/27611865655.pdfIn PDF document text
    • http://linkipt.com/_UploadEditor/files/69570760301.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/46618320276.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/julasugulejuwosop.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/davekotonusalarulavesum.pdfIn PDF document text
    • http://hkacca.com/userfiles/gifutevezomaje.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/37694229039.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/161341b711a771---poxezetezik.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/vozowusezuwumojake.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/7c9dd8ec8a2ff9ad400c9701a0625d55/29107630636.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210907140323_4gst2c.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613673c6992d8---92358721085.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/15459252387.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16143ae6869ea7---xuxijovipax.pdfIn PDF document text
    • http://mannaz.pl/userfiles1/file/zogowuvazafubefezemenemi.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/53190819652.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/5267eb758df2dd9834669ae4549a6930/3802824560.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/venofomusoj.pdfIn PDF document text
    • https://lekkermooi.nl/userfiles/file/gowewozowipogitak.pdfIn PDF document text
    • http://wirtrauenuns.ch/images/file/47091636573.pdfIn PDF document text
    • http://bronnicy.inhome360.ru/admin/ckfinder/userfiles/files/lotuxow.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/71344933361.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+remove+pattern+lock+without+losing+dataPDF 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_off0000df13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF13 11296 bytes
SHA-256: 4f58dec684cc77a07a22c76f9a399a6fd4524e8f5c71d3ad65282de05a7d9028
font_01_sfnt_off0000f934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF934 18440 bytes
SHA-256: 688f2155b7cacb5d3fae0314488b827232ae017c200b095362c5fdbc0f6724bb
font_02_sfnt_off0001285a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1285A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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