Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0539e013f977227…

MALICIOUS

PDF

80.3 KB Created: 2021-09-10 02:04:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7bc11b6836160ef15ebd09ffdbbc76b3 SHA-1: a5ff97f54b7769a79b09505622da314794bc49b6 SHA-256: b0539e013f9772273235e991c729c5c076f6a4404fd34e263235569629d66255
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous external URLs, many hosted on compromised WordPress sites or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable binary data, but the heuristics and URLs point to a malicious link farm designed to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://philabc.ru/uplcv?utm_term=what%27s+a+widget+on+my+phone PDF link annotation
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sobijusuw.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/wupigozekitijitifewedet.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/18994681444.pdfIn PDF document text
    • https://morganmethod.tuesdaytrader.com/ci/userfiles/files/wonubipasawetizekelomal.pdfIn PDF document text
    • https://tiemhoamo.tiemhoahaibara.com/data/dulieu/files/bugubewegunode.pdfIn PDF document text
    • https://philly.drinkpoint.com/uploads/files/93967742918.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/15959445999.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/005f3ec1c792c1ccfd2810fa2945112c/36854224978.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/70334335821.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/sewebuxuz.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/26011022396.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/f74f84c0c444055f1d3288982b6d2cbd/wutimobi.pdfIn PDF document text
    • https://banghenails.com/upload/file/dapumur.pdfIn PDF document text
    • http://armanetti.com/images/22112830747.pdfIn PDF document text
    • https://hinodecoder.com/userfiles/file/nugutixelokunukafami.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/cbb67a29tt7g5s2ubkcbjbe364/98587672054.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/2979639059.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5fb558972---34203423318.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16134a3883dd92---fajepijumo.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349aee03d3d---jugedawiwajafus.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/dulinopunebigejupox.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/butojozefox.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/34986634129.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_off0000d898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD898 16360 bytes
SHA-256: 0cdf50c95b9be826e453e6927568b3168e309f3ef72080eb6b8ab314ba3f23ef
font_01_sfnt_off000102ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CE 10920 bytes
SHA-256: 659a21539cf1db1a912f695c18e9a0107ec00382b96519378f4ddb0bf6c699f6
font_02_sfnt_off00011bd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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