Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca66c20486d1704e…

MALICIOUS

PDF

83.1 KB Created: 2021-09-01 11:23:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1c75f1e04d24facc4b467207c3b5d302 SHA-1: c868576777142f8a5f9f96c7eff815bbfd31aeac SHA-256: ca66c20486d1704e6dceb7c680350af27e21c64b39821d73dd3e3e1559d790f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous distinct hosts, many of which are compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The presence of multiple external URIs and link farm indicators strongly points towards a malicious intent to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822b19bfb41---88758436243.pdf In PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/471f15337247afce4b6d89f820cc92df/98638539267.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/bosisapiwulemazazalupi.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/jiwufizifaludutogijufo.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d088173e6df---90471102464.pdfIn PDF document text
    • https://cecprint.com/images/file/24376952243.pdfIn PDF document text
    • http://fractinvest.com/uploads/file/97767811539.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/001eebcab2563784fe0deb1b9b4f06df/4195551280.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/45421352456.pdfIn PDF document text
    • https://kasihpaham.com/contents//files/rikelowekegegiwaxevo.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/napibakubiwi.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/b59df056095b6cf01c520bcb94b1084e/moxaniguw.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/fadofulasoganunanetat.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/8d7752982710f94692b6103e7aac3662/65335213567.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/4c82c5f0189702e05c6533df77bfe539/39556141775.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/6598efb89d2e86348de7315b485bc1c0/1101266364.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094ff9d5f4d0---fikaziripamaxowazibaji.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/toreputukodunikejaraneri.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/perifeli.pdfIn PDF document text
    • http://longhornrings.com/clients/0/08/08da48574b41509ac7bedcf2500dc652/File/xifebebatujigepinora.pdfIn PDF document text
    • http://moda-minulosti.cz/docs/momin/file/82182297615.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/terexerejazedo.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/penajusos.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/menijesumatafawokagufi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=holy+holy+holy+the+earth+is+filled+with+his+gloryPDF 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_off0000deb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB0 10720 bytes
SHA-256: 4d801df2b5535d220e971a336e35cab7ee1704e42e0ea90a9e2f02df158efc91
font_01_sfnt_off0000f742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF742 18100 bytes
SHA-256: 4c36f7eaf121c3703455b898da33f094a52c6102f7c2a9e9523a49a2067e4710
font_02_sfnt_off000125a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1