Malicious PDF — malware analysis report

Static analysis result for SHA-256 faaaf01d678e970b…

MALICIOUS

PDF

73.0 KB Created: 2021-09-05 22:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c3bca51004d8407a78bafcf392fb6d20 SHA-1: c6ee3359ca404c2c40edac990beae30f718547a2 SHA-256: faaaf01d678e970bd9243ae5d970c108b4a58228d167addf3aed2b34e69720ba
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to potentially compromised websites or disposable hosting. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings suggests the document is designed to redirect users to external, untrusted resources, likely for phishing or malware delivery.

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://villalapinetafavignana.it/userfiles/files/2182657632.pdf In PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/3d929f3eaefe7d72d204fb0c57b527b9/bokinexogojusot.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/xusomofedetisobugowajutaw.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/d2dn7cn1cqts14ugku7c4jjoo9/kezitarinogegolikodenuwo.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/tebajimur.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/de9c370388f501289f39c38f779907d3/5679617387.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/zujarazilagose.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/gukogi.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/jesaruwi.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/jededutasefeb.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/83587701885.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608e18a96d06c---xodokixuli.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/55674792372.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/2400fe2df8b86576253c8ab1854c588b/63856938168.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/8d8e032edc9bcc17b2c5efab86f21a54/dofojesumadunona.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/xuzanixukakegizujix.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/zokunigu.pdfIn PDF document text
    • https://progin.ch/ckfinder/userfiles/files/24212117317.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/44165842936.pdfIn PDF document text
    • http://odontotecnicacoop.it/userfiles/file/95059763320.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/7697296427.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3e5fccf8da---futekawezapudazonikipanap.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/telabegubitafe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=medicina+ancestral+y+epigenetica+florencia+dafne+pdfPDF 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_off0000b91c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB91C 16972 bytes
SHA-256: e9e1104d3cb2dfcba5455b58f9b1b4b4a0e3886b39c74fc2e86f6b4ff590efb6
font_01_sfnt_off0000e4ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD06 10904 bytes
SHA-256: 34edbcb5aae4789fe39b552fa8e5a567e5088942dab35abd2e94b57ca4583039