Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9ab7c60945c23f4…

MALICIOUS

PDF

93.6 KB Created: 2021-07-14 02:42:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 561142fd81d554ddcc97989393b1c94c SHA-1: d2cc42e4d41f6d09e00ded65a9ecfafd5ab19e18 SHA-256: c9ab7c60945c23f4109acb42f947245e65c881a5109287210095ceecb678bab7
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, likely serving as a distribution point for further malicious content. The presence of multiple compromised hosts and disposable hosting links suggests a deliberate effort to obscure the ultimate destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://pizzeria-millemiglia.de/app/webroot/img/editor/file/26217197103.pdf In PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac44ff91ba9---19541688998.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/9188721b23557772a904dcea96250574/mesafotiwus.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/mepokodejoj.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ccbf85e04---14367988274.pdfIn PDF document text
    • http://huonglonghotel.com/uploads/image/files/natokufin.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/vojutirimebonadiw.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab8e45d718---3508354524.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16082554b9c8cc---benajebabajuwoze.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1c35623b3---10205885112.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/qkhkp09bftfj18qsu5te4htduf/6673813052.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079257847b32---21008180352.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/6i4brmgbd0vkuf7ga76vs5qk1u/87376074148.pdfIn PDF document text
    • https://nevisnews.com/userfiles/davalopomikikolivupi.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609312b56002f---36476928889.pdfIn PDF document text
    • http://southfieldhigh1973.com/clients/2/27/27a5067865c8334ad4a5a1fd7642c928/File/xolekuzivema.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/uc2taa42g79aluj0n89c8qfk67/3348909869.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/21023688615.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/67969331ff61240ff8bd13e800c1d7a5/48030825265.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/wuvixekesene.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/zijorafasuwigovuvelok.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b355da4a561---79122267132.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8dd1d057c---lenamiwejup.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/51753030789.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=and+you+know+we+are+on+each+other%27s+teamPDF 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_off00010936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10936 17844 bytes
SHA-256: 35b17cd2ee98b2b49501d0ed8ffbb00493ca04ffb5c522cec34df5d9e054d4c2
font_01_sfnt_off00013799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13799 10904 bytes
SHA-256: 69bfc4f256d4d022e039b45c2b9e43159d4c070330c851e390270a6c040ac700
font_02_sfnt_off000150dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1