Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b886110aac12593…

MALICIOUS

PDF

84.8 KB Created: 2021-07-05 01:55:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1fd072b7504abe31dc1563d6d3703a63 SHA-1: 169ad24e86ddff1bfe3deff37cfdcdd105f02eb1 SHA-256: 1b886110aac12593be12e878ae75871b73cc56375ae113e85f7932c13e6e203d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, containing numerous URLs that point to compromised CMS upload directories and disposable hosting, likely serving as a distribution point for further malicious content. The presence of multiple PDF links within the document structure suggests an attempt to lead the user to a series of malicious documents.

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://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7d54067ce---1921767234.pdf
    • http://adance0112.com/upfile/editor/file/sawerek.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608820ec00554---muzim.pdf
    • https://commonwealthsportsawards.com/userfiles/file/67886274446.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/ru4ev8kd27ov7l3kskeoolqr6m/vujowolamazasesolago.pdf
    • https://marosme.ro/hirek/file/lojunonupiripoxinom.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/106c5f7929612083a827ac75632def67/73639691099.pdf
    • http://alituncer.com/userfiles/file/nekulobatomanibugab.pdf
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/bf50c211d5b361e13cf07a172cb2ff6a/tamulakivawo.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16082428763431---wunufidafagu.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/hpc7rjbaceb6m4of9eb0glhe63/jibatugeropezipopitonilup.pdf
    • https://tucarrorentacar.co/ckfinder/userfiles/files/firozisusasaragojo.pdf
    • http://msamerica.net/clients/873634/File/27138344374.pdf
    • https://organicfertilizerproduction.com/d/files/52046163693.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607281be12836---zusirevidoxidumegigas.pdf
    • https://alkalacarservice.com/public_html/userfiles/file/gumorunosinidiro.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b18207039ba---71949284751.pdf
    • https://alrukn.co/userfiles/files/76542491539.pdf
    • http://houstontca.org/Content/uploads/files/sarabuvukapovusebit.pdf
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f349b4344d---92211528904.pdf
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/kuruvisalupevovogujiz.pdf
    • http://cpgny.com/userfiles/files/85360134889.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/afef0accd35ba07bee89eea028d3d823/wezixuxukiv.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=simply+wize+puff+pastry+recipes
    • 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_off0000e65c.bin
d5d7c52366ce5aaa5399ac215fd64005ebe74553b12ff41d5ccefea756c7fbe0
pdf-font-stream PDF embedded font (sfnt) at offset 0xE65C 10852 bytes
font_01_sfnt_off0000ff8e.bin
91704af8d2f22973f5aeed7d9f2fd77b341c4f4b3ac6b61df001d036e34e048b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8E 17588 bytes
font_02_sfnt_off00012dc4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC4 16792 bytes