Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff0a78e57b827044…

MALICIOUS

PDF

84.8 KB Created: 2021-09-03 15:58:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4f35c582273b618034698ba920f494da SHA-1: dfd528fe25f09a26a7a7ecf9ceecf02aa927f3ee SHA-256: ff0a78e57b82704446e08cb41a9af1d353992bd05048d30d9029d575876d062f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing lure designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://wfca-czech.cz/temp/userfiles/files/99230418238.pdf In PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/81643293433.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/5b695710d10cc43b0805a40c0d605818/35195917373.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/q55d5e1csitdhmr3n3rhfesj94/17180947274.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c6f81f2f8---41749788350.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/36851859175.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/59561792608.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/pupuzisidowedito.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613044477850d---26178412725.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/q7ilqo6os0dqh38ju7p1840mtu/fizuwivoromexizudus.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/zazovurikoboworuj.pdfIn PDF document text
    • http://dbexpertise.fr/catalogue_dynamique/file/71718703989.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/dekosuluribowi.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/87562263268.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/m48nj1sbqufv2lns9l3eekbhr9/ketipabukidiwipituzelezo.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/26200690797.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/tifitituk.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/wuvarogodeletos.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/vajivi.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/vadobekedemegebiwidazor.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/95f840a81e0240e7df052af341689aa0/19869753284.pdfIn PDF document text
    • http://myphamasia.net/upload/files/59278788526.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/96075525285.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160ed7c1f2374d---xavuzazijovopula.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/5c147305f08b2fd33a1ce8960fb56ae9/pafuribovonap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=subject+verb+agreement+exercises+with+answers+pdf+grade+6PDF 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_off0000e19e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19E 11768 bytes
SHA-256: 899a254737db13501f2cdafd63be2dcffffdfcac9b8ef1bf34035f75ad4327ad
font_01_sfnt_off0000fd2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2F 18496 bytes
SHA-256: 595176b0ea62885c54a039a199e36b423f55f32e1d89c90b0afa074cdb0b6bcf
font_02_sfnt_off00012cbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1