Malicious PDF — malware analysis report

Static analysis result for SHA-256 71824c82d321e66d…

MALICIOUS

PDF

82.2 KB Created: 2021-09-15 15:07:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 282f26654af5cd437a7d1199c313ed8a SHA-1: 33c3f584193857e3c47850b98ea28765e660be81 SHA-256: 71824c82d321e66d055905b67dd18ac0695a6f412dda90e712faa0b1ac3cdb62
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve a second-stage payload. The presence of external links and compromised hosting suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://medvor.ru/uplcv?utm_term=opening+vidmate+app PDF link annotation
    • http://gesundimjob.at/images/content/files/wudinoloripuzele.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/57791863735.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161382de87e276---60242179843.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210910/file/19273549960.pdfIn PDF document text
    • http://chinalabware.net/d/files/wabujopofosu.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/maxodubib.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/161335f46ea654---15979787274.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/fuxefizev.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a7a886ddd---tifupudelow.pdfIn PDF document text
    • http://krishikhabar.net/assets/ckfinder/core/connector/php/uploads/files/80195825504.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/31435172416.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/lijore.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/keravinokokole.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/96060197987.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d605d32b1---58984659966.pdfIn PDF document text
    • https://edusfera.pl/upload/file/fumorumitimumabe.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/vebomewiresaforenatomin.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/70446710036.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/virapijipujoxexaz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ff7b3fa39---jesonij.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/zarunokerosarodarepebepat.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/bewuwibitogosazuza.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161305bc4e2ed4---rebewo.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/gesefabefovidenaw.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/91616286840.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_off0000de98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE98 17492 bytes
SHA-256: fd482eaf0cad2a194ea863d4cc229f22e5c31b2992cb8a688d66dace0fab7c80
font_01_sfnt_off00010bd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD6 10392 bytes
SHA-256: 5aeda8532d901e8cf58844692ff156b21f2e5f4bc37dd9db8ae5ae20a341dcb2
font_02_sfnt_off00012333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12333 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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