Malicious PDF — malware analysis report

Static analysis result for SHA-256 eea11049832cbc95…

MALICIOUS

PDF

73.8 KB Created: 2021-09-26 08:46:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 94b53d4c53daa41589385d5fd9129b47 SHA-1: 425327a24d02a935c32c064ed8b9be23802d7b08 SHA-256: eea11049832cbc95ec8f53e7749abc2e48fa2390dfbd2f4400afca60a9088a15
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to potentially compromised websites. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. Although no scripts were explicitly extracted, the nature of link farms in PDFs often involves JavaScript to redirect users, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://crysiq.ru/uplcv?utm_term=login+register+template+android+studio PDF link annotation
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613591400273a---98634871572.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/26424768940.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/fonelozigesagixoxuferux.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/savazuxixebosa.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///84198895153.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/lilogajipu.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/paxegorokemuj.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/53880694470.pdfIn PDF document text
    • http://tranindo.com/Uploads/userfiles/files/19192407222.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/49372502550.pdfIn PDF document text
    • http://hotel-ambassador-nice.com/upload/files/1088732021.pdfIn PDF document text
    • http://fpole.ru/sadm_files/5065912748.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/gujaweletadi.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/1ti8sbmfrc1l302ambs05vi78a/sawil.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7284cdf39---45585134573.pdfIn PDF document text
    • https://avenue102.com/uploads/file/damexadiz.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/kejolu.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/lukogujotuxamipuvifedi.pdfIn PDF document text
    • https://associazionebriciole.it/public/file/sugokobuz.pdfIn PDF document text
    • https://slavicchurchmississauga.com/fck_upload/file/madumemefijumolafalogo.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/55062450827.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/walenobetopanunofodunawoj.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/22085885146.pdfIn PDF document text
    • https://xcheck.vn/uploads/userfiles/file/54973580059.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/zazematukigifenatasa.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_off0000b4f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD0D 10792 bytes
SHA-256: d5e87b574d685618c6e3c4686307311494433b7d80bd4b90f3e14d6ea94f1d19
font_02_sfnt_off0000e5a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A5 18944 bytes
SHA-256: 4b7106983bd8ea8885e89f1d807f31717e943fae5f7948bd5a85e713bba89979