Malicious PDF — malware analysis report

Static analysis result for SHA-256 353243af64862abb…

MALICIOUS

PDF

78.3 KB Created: 2021-09-09 08:10:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 329283fb351b219714084d7e5576ebda SHA-1: c39a49d40119b09fbca8bcdbc4319422f4879704 SHA-256: 353243af64862abb3a2259ce86f6da08d47bcc8bad4d01b3dc54787effe38909
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript T1553.005 Security Software Installation

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The heuristic 'SE_SECURITY_BYPASS' indicates the document likely instructs users to disable security software, a common tactic in phishing and malware distribution to facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://krisoc.ru/uplcv?utm_term=there+was+a+problem+parsing+the+package+solution PDF link annotation
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/161316a1e754d3---68150762210.pdfIn PDF document text
    • http://rabotatver.ru/userfiles/admin/vawevibulevepolegobip.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/fovobunikaruwep.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/lofedibugulawijunexorezej.pdfIn PDF document text
    • http://kerekesvillszer.hu/UserFiles/file/jofub.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/13002255112.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/42695069332.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134164c445cc---90071063739.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/5b5f3678b07b1c348fd3bc09703c1100/63185954703.pdfIn PDF document text
    • http://traktor-tv.de/sites/default/files/file/mezoxige.pdfIn PDF document text
    • http://changjiujz.com/uploads/files/202109082125518996.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16138dd0573316---kizogezesewi.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613936daa4e05---siwigikisafolete.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/91807708899.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/forujajusekeromogageme.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/fokev.pdfIn PDF document text
    • http://eskuvotoszkanaban.hu/editor_up/naximu.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210904020106_1617214342.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/6a442b4bf96cd7fb1ffcbd9ceef3579a/89813285561.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/magtr2n83hdjc9mvnur8v4hi96/tenuvovukaxawiguda.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/37689436970.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613959585f234---rozenowojo.pdfIn PDF document text
    • http://kingkady.com/uploadfile/files/vitoba.pdfIn PDF document text
    • http://zaiger.ru/img/file/jofip.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_off0000ce30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE30 11200 bytes
SHA-256: 85206824763bd2170d701998a945649992a184c140b05e2ea82a54a05d800861
font_01_sfnt_off0000e817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE817 16604 bytes
SHA-256: cec7cd1e846948a90c1c4395ae6551bd6d9f2d019a527377eb3aeda5496d80ce
font_02_sfnt_off000112ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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