Malicious PDF — malware analysis report

Static analysis result for SHA-256 83beb97fe638df9a…

MALICIOUS

PDF

80.6 KB Created: 2021-08-02 04:47:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b4267bbb9cf3bb935c59567909d888e7 SHA-1: d2dcd23edce7da622e69ab855a110ebbf541875b SHA-256: 83beb97fe638df9a6af69bb575bf390e714236208e537274d512f8117afaad7c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple domains, some of which are hosted on compromised CMS uploads or disposable hosting. The embedded URLs suggest an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://divinenine.net/userfiles/file/vopavakifakudukajeg.pdf In PDF document text
    • http://dok-vo.ru/userfiles/file/82340579242.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/ranunesox.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/70871315075.pdfIn PDF document text
    • http://zzweien.com/d/files/kavagaku.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/69564497704.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/82978169795.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/posijaxanor.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9ca536f85---sijudewinubiko.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/bekuzemefidobabefopebafa.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210728092525_6izeyl.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/gijubawelesolug.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16085acf1b3dac---guketigunofekepodamu.pdfIn PDF document text
    • http://strandedtattoo.net/file/berupozasad.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16088f1a42a6f5---fanefakukuxugevol.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a86726967dc---67034705337.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/wovala.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/finub.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/rciskjfskq7b1njlno64l3b19g/buwopelatige.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/30570195690.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/29978934144.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/b65481316c1796cbd7388996e6b21cbe/19603225202.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/74797842208.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/tr2btskfume1m1hnf4t23613e1/fuzesiwijoxumitejalu.pdfIn PDF document text
    • http://sacmacbook.net/userfiles/file/lofenabudamanurited.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=cpe+practice+test+3+answersPDF 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_off0000cfc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC3 10492 bytes
SHA-256: aa397574251ecbcc501048815446c77fbe0248c3f8c3b6db7b553df28d1bc794
font_01_sfnt_off0000e7da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DA 20968 bytes
SHA-256: f4e2626c0cc222a0ded2c256f27943b32ccff55534aa27970e352c31c132cc66
font_02_sfnt_off00011cef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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