Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e5000b642cf5052…

MALICIOUS

PDF

98.0 KB Created: 2021-09-01 12:09:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 41ab485b8593b08b639ec87d37f68ff1 SHA-1: dcc55eead813dfd409761e420ce6338358acca60 SHA-256: 8e5000b642cf50527f18b21cd788ba1269ea49bec8ed2cd80501c96550c83a9b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It functions as a link farm, directing users to multiple compromised CMS upload URLs, likely to host further malicious content or phishing pages. The PDF structure itself contains duplicate object bodies, which is a common obfuscation technique in malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb55b5a253e---62315552218.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b926c8373a8---54584566638.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608370274d6e4---72114367682.pdf
    • http://gddfboiler.com/uploads/files/lebuzisovubifuri.pdf
    • https://plewmal-d.com/Uploads/files/wababufi.pdf
    • http://burelomdo.com/ckfinder/userfiles/files/69189183012.pdf
    • http://slsnn.ru/content/files/47518021571.pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/0c06c6279cc4c4f9d3a7ad6ee3baa280/kuvumesugizitorase.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/1910b7b84ff2c2fdf42187d327673b38/sevanusobew.pdf
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/dibaxok.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f500cc8cd2---paxonijuladufi.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b73bb8e2d6---46227127312.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b856fb116fe---57473873737.pdf
    • http://smcertificationservices.com/userfiles/files/32199714827.pdf
    • https://daquin-ferriere.fr/userfiles/file/68519061721.pdf
    • https://jbdclothiers.net/emailer/userfiles/file/40170864570.pdf
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/6df53345b798679e5e00268efdd0b2d0/13184506320.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c04ffc82877---36087042582.pdf
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/febil.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074007619de2---75657065252.pdf
    • http://aryajob.com/user_upload/file/4597450152.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ce7c3ae7b---83609114317.pdf
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2a609bd61---19883989771.pdf
    • http://slmj8.com/data/userfiles/files/30637001132.pdf
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b6e585b6a---xitutinadekirigada.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=your+welcome+in+arabic
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000110cc.bin
270db9620642c12f4cf152e6a489be019fa41ab6c535b0fc056e3c398da09dd0
pdf-font-stream PDF embedded font (sfnt) at offset 0x110CC 22140 bytes
font_01_sfnt_off000149e9.bin
90f8c52ec6a9103e3ac0e183a5d734684f272133d039fcfab9a024e8ffd16c30
pdf-font-stream PDF embedded font (sfnt) at offset 0x149E9 10432 bytes
font_02_sfnt_off0001618a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1618A 16792 bytes