Malicious PDF — malware analysis report

Static analysis result for SHA-256 27f95163e7e0966b…

MALICIOUS

PDF

86.6 KB Created: 2021-09-01 08:38:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 28105496c9f9ce6746e44b60392db621 SHA-1: 777380118fcbab362ecd07ba8ee66b838c2feead SHA-256: 27f95163e7e0966b9a80aff2fa0619035e1693ebfd11e742d56036bc17780846
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to a variety of domains, many of which appear to be part of a link farm designed to obscure the ultimate destination. Several URLs lead to compromised WordPress upload directories or disposable hosting, indicating a likely attempt to distribute malicious content or conduct phishing. The ClamAV detection and ML classifier strongly suggest malicious intent, consistent with a phishing or malware delivery scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://laborke.ru/uplcv?utm_term=how+do+you+grow+nether+wart PDF link annotation
    • http://alnadaoil.com/userfiles/file/76045237028.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/63501254960.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/35989979206.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/70274690561.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/81257363911.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210706_3BA088D7CF5C5CB5.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/43200285978.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/fe5cded1b184560d843a26b1541cdeb4/36400147878.pdfIn PDF document text
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/zememukexodopokemebeli.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/30683136801.pdfIn PDF document text
    • https://ancoraeducacion.com/images/25609337533.pdfIn PDF document text
    • https://unifor975.ca/userfiles/file/fefewume.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/9cb5163bb837a38b53b2bf2b9bdac121/1615485044.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/c4065e024b08289ac46d46fb524afbd1/bufapafipotadetozapig.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608174b9107e0---lukugegonopidikirumu.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/90608982184.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/dewumajaketegimitewogarav.pdfIn PDF document text
    • https://pasarangroup2.com/contents/files/63043767121.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608df0817c597---7480080769.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc9b034e7a---53966333757.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608860b565d86---xopobegawizumu.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/56655830127.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/mowibekal.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_off0000ef43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001075a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075A 10512 bytes
SHA-256: 768bcfd085df2eeb247a0df12367292d571f19460b0a9346a84ec41aae19d4cb
font_02_sfnt_off00011f05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F05 17400 bytes
SHA-256: 65ed79ae9cdba2be76d112c9bd7062edc5cb55d1088b48f478216e865d92187c

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