Malicious PDF — malware analysis report

Static analysis result for SHA-256 04948f0065b52665…

MALICIOUS

PDF

85.9 KB Created: 2021-09-16 21:24:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 60202a38e2943bb5ace807dca81a3436 SHA-1: 0b3977157ee45f510fc6228757655e5e3f84307b SHA-256: 04948f0065b52665b0786c333561601c67d5759d923b6bd58f3fb4d17424657a
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to domains flagged as disposable or potentially compromised, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://xn--49s538bo8ux8c.net/userfiles/file/86876490912.pdf In PDF document text
    • https://gymlesgeants.com/upload/editor/file/95556229769.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/sivovefulepi.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/koref.pdfIn PDF document text
    • http://landia-print.com/pdir/file/vimomeroweniwulewotokimuw.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613399249af3c---70033317732.pdfIn PDF document text
    • http://strahyi.ru/images/file/bexipudugofiwobesasok.pdfIn PDF document text
    • http://www.jobibon.com/admin/userfiles/file/78368642203.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/13822734939.pdfIn PDF document text
    • https://testgit.begurholidays.com/uploads/userfiles/files/10900580320.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/dc32f8b499c4897c59ad29cbab3b692b/fokaduk.pdfIn PDF document text
    • http://hkwwta.org/userfiles/96244860710.pdfIn PDF document text
    • https://anjingliar2.com/contents/files/5698396025.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/53931011512.pdfIn PDF document text
    • http://myredm.ru/uploads/file/42203825315.pdfIn PDF document text
    • http://precisao.org/files/files/68229135228.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/95505321071.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/59683755973.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/70599580298.pdfIn PDF document text
    • http://yuli-china.ru/d/files/79608896521.pdfIn PDF document text
    • https://eccdc.org/application/webroot/userfiles/file/92738039899.pdfIn PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/fodatufu.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210910030547.pdfIn PDF document text
    • https://ist-lb1.istanajp.com/contents/files/tamegopulodajorikip.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16132748a3f781---vuzudijesasuwobure.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/24574876454.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=meaning+start+from+yPDF 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_off0000ea2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2B 18276 bytes
SHA-256: 58929bf06bfa25bd05b8849e8887ca86eeb82d2561a6dd87f946d6f524311ed5
font_01_sfnt_off00011977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11977 10616 bytes
SHA-256: da47ec1358e1dce1aa3388c867a456c3583a2fdb15b5ae6debd10a837e83c5c3
font_02_sfnt_off000131cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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