Malicious PDF — malware analysis report

Static analysis result for SHA-256 f789fc588eb27c0c…

MALICIOUS

PDF

87.5 KB Created: 2021-07-16 21:44:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f0171f799314c674694a2356d00cb937 SHA-1: ed45ca000fb5790abbc63eb0747e5e80cd755041 SHA-256: f789fc588eb27c0c64dce03229c9626c4b041e82d5e776fe514cab0af7ea017a
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable domains, suggesting a phishing or malware distribution scheme. The presence of multiple links to compromised CMS upload directories further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://boathousebrokerage.com/userfiles/file/57422096758.pdf In PDF document text
    • http://charivne.info/images/file/12986885780.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f311c3241---45173220647.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/hjgrsh6qrn0lf7kjab9a9dapvm/lobunerakisan.pdfIn PDF document text
    • http://ktcz.eu/files/files/13625979576.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/gelijobi.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/71970726777.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160abcd7e5ffbd---67761558328.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/lh59qajcogu9n7ibdn48uh15l0/30277858309.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c2961499d37---daxurodafefaluziluvut.pdfIn PDF document text
    • https://clinic4lab.com/upload/ckfinder_temp/files/20210617123041.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d51b6cdd1---39195914786.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ea962d61cea13acb221148b346911f11/5241400905.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/gijetaxafubanezefelex.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d87730b4610---jegiforumuzoxaturor.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8aea3154b---jikakivapujefabizabuz.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/18527317867.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/popoju.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/gorutigotoreximinuxofa.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac3bdb5069---20732011332.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/a5emjad29njh32cs9fkrk6ippf/vodulepopiwuwu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=review+sheet+42+anatomy+of+the+reproductive+systemPDF 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_off0000f18a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18A 16852 bytes
SHA-256: c82858a6bb50aaa688264d856e48c52584f468058b6ff5d3e6f380b3a04b6c80
font_01_sfnt_off00011d6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6B 11448 bytes
SHA-256: f196c15cbb1c3e7ef9c158bf0e4900c23f18e70806d8993e8d073bba2be78361
font_02_sfnt_off0001387c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1387C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.