Malicious PDF — malware analysis report

Static analysis result for SHA-256 afc95bdf033953a7…

MALICIOUS

PDF

75.5 KB Created: 2021-10-08 18:13:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 01989f1c5a9052d17eee8587cb193f10 SHA-1: 6e0eb1dd533ec6da5077497125e4b51918d1d163 SHA-256: afc95bdf033953a7841bca82eed4d93e6c0244c647c1089c0a87422e609199b5
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL distribution are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://inwebjor.ru/uplcv?utm_term=gam+add+user+to+group PDF link annotation
    • http://xinge168.com/uploads/files/20211001031505_800349.pdfIn PDF document text
    • https://siemreaptraveltours.com/userfiles/file/boxipivuxep.pdfIn PDF document text
    • http://www.hgekc.com/media/userfiles/file/28635642763.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/digamasurit.pdfIn PDF document text
    • http://fgosvo.ru/files/files/91058360529.pdfIn PDF document text
    • https://fivetc.net/uploads/files/figiduduwexupiwebixeviwo.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/97228825465.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/11377599891.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/kipebosiketofot.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/8896675521.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/3ef41c1272b2db3d04f6c0687f4b22ea/dalisawexelinasowewar.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/567aeddcf81c935e2af6af6613c2be86/30510320297.pdfIn PDF document text
    • https://emartdeko.pl/galeria/file/73917443561.pdfIn PDF document text
    • http://choragwica.pl/userfiles/file/banadixizupepuxeved.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/vodukigibiside.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/89947257296.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/lomajofewatamo.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/722692a9815dc2d298f93319f6201a8d/56631267661.pdfIn PDF document text
    • http://canadanur.com/resimler/files/lexixana.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/64641583932.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/pelibum.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/84331964011.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/64330675685.pdfIn PDF document text
    • http://lifecontinues.ru/images/files/semabarijotujili.pdfIn PDF document text
    • 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_off0000c4dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4DD 10632 bytes
SHA-256: eafd039f308894f565dab01310feca17923c504c71482d33655f736827039b5e
font_01_sfnt_off0000dd09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD09 16780 bytes
SHA-256: 900123454fd27b8a21d3dc75a2e1853c34adb4065b0a7e7354bb031e519b9157
font_02_sfnt_off00010887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10887 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1