Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa5ae3363a7b7e25…

MALICIOUS

PDF

80.6 KB Created: 2021-09-21 13:58:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: def503235e2690d0d9bd8b27836820f0 SHA-1: 28ab5955e30f5664eabe0ad17ab0efdb74ce2594 SHA-256: fa5ae3363a7b7e258aefbdd5417bb1a113be54bdd23f8edba300bd95817ba3d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=why+cant+i+download+snapchat+on+my+android+phone PDF link annotation
    • http://autoklej.pl/app/webroot/media/files/gibezumisupokumu.pdfIn PDF document text
    • https://goldengatetaichiqigong.com/userfiles/file/nokijulexufuwimiwugazesu.pdfIn PDF document text
    • http://ave-france.com/pics/files/wozopigekumux.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160da0e2cf08b7---nabemisurinabavujaja.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/tajepowabadasa.pdfIn PDF document text
    • http://ailizia.com/userfiles/tonawuguwawi.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/gaxepesafitubosusubojelar.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/larininigupax.pdfIn PDF document text
    • https://conrays.ru/f/data/1953409073.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/1823720982.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/toxegatuterugipadiwuliwox.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/pesafegami.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021090701545473499.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/4432280474.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/limufetigumes.pdfIn PDF document text
    • https://network-italia.it/file/pejumenujiriruluxezixeje.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/31237206851.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/cdaa2e911362282c2b9f75d471f76f45/demoxiregaku.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161445f976a6ba---26171814467.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/laritowawogi.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/tamixadin.pdfIn PDF document text
    • http://markaz-e-durood.com/EditorImages/file/misiliseram.pdfIn PDF document text
    • http://surestegc.org/documentos/file/zekedofalezetevigisotebu.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_off0000d7a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A8 16808 bytes
SHA-256: a89623fd10188cd0f46aa2a710f240564786211da942953c403b3c3ea9ca0336
font_01_sfnt_off000102ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE1 10972 bytes
SHA-256: 1be6e3ad7862893603bff7157606cde7398ce4e375f94adafff6bc06faa326a3

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