Malicious PDF — malware analysis report

Static analysis result for SHA-256 f39d1e975a06c12f…

MALICIOUS

PDF

80.9 KB Created: 2021-09-18 17:25:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0dbbb20b58276e47d50e0ac74d59e7bf SHA-1: b920c1d1d18d26b418922992049a84a9d1e3a8bd SHA-256: f39d1e975a06c12fc958b217bed2e1b050f217b1cab3dd3ff5bfad9a566d2c1e
172 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple domains, many of which appear to be compromised or disposable hosting, suggesting an attempt to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/161426c1471c38---raguwita.pdf In PDF document text
    • http://mackyz7automotive.com/js/upload/files/43454997273.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/61493569776.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/44507509116.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/dikusobo.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/23177d85f8d2fa70af9ac182cde04adc/rapozunoporib.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/pizopobusumi.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/tibud.pdfIn PDF document text
    • http://one9five.com/userfiles/files/tebivirelawowita.pdfIn PDF document text
    • http://kelkenaghshband.com/app/webroot/img/files/tunirumap.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/japujazonebu.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/98658666745.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/bawaxifeda.pdfIn PDF document text
    • https://5of7edwardstreet.com/assets/media/files/siturubutaxipewo.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134df142a245---8519335287.pdfIn PDF document text
    • http://www.globalnautique.nl/upload/files/93098273021.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/16372509717.pdfIn PDF document text
    • http://luatsugiadinhviet.com/upload/ck/files/gowudezasuxa.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/38978920681.pdfIn PDF document text
    • http://fkhd.cz/data/img/54022019976.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/bejetasaxoxejav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=android+guitar+tunerPDF 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_off0000d706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD706 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1D 10288 bytes
SHA-256: 1104e257d559fa6380888515efa70b6279317e0366d7ad2a620f64839a02bccb
font_02_sfnt_off0001062f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062F 18492 bytes
SHA-256: 7290bd34644b528e87de0e5a50568e8434f6eca8271eb100079215e22209825f

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