Malicious PDF — malware analysis report

Static analysis result for SHA-256 803dc3b4db3421e0…

MALICIOUS

PDF

86.7 KB Created: 2021-09-19 01:59:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9213e5bc6e419220a24c3e2ba8441646 SHA-1: 8c2a69a6f9308bb6b7436c7182b3f19e318acccc SHA-256: 803dc3b4db3421e0ba690e9c5175bce37da6fea258cc79bef570d9ad9949e222
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer, likely to facilitate the download or redirection to a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=dls+2020+file+obb PDF link annotation
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/0c6ddb2acb3f338bb065d37c585b952f/42955313532.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/xadefiwefuvotasolaremik.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/gafadisegexavidirejupi.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/52765221036.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/64539d1c8c5c6db97771352052b1ffab/40212768697.pdfIn PDF document text
    • https://woft-dining.com/webroot/editor-uploads/files/xivonulavu.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/ninijijudarixujepew.pdfIn PDF document text
    • http://gardens-spa.com/user_pict/file/novisesisikizugaji.pdfIn PDF document text
    • http://wuyioutdoor.com/userfiles/file/93294436886.pdfIn PDF document text
    • http://taihegas.com/filespath/files/20210909055003.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/42213902744.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/h9c9vt7ps0r3b82n54qt45vfe9/46693130111.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/wujofe.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/nivefenoxoregonadelafozil.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/28569627981.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/33132459601.pdfIn PDF document text
    • http://www.grifin.sk/files/zaligazasotufapefawun.pdfIn PDF document text
    • http://lulanjina.net/upload/files/lanifuvibixibetatilap.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/xinap.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/81720934380.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/90073815606.pdfIn PDF document text
    • http://thephinhmienbac.com/upload/files/laronofemujejuwopef.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/detazujipemizepurubixo.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161340591b1061---bewukedupajuxevizojoxo.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_off0000f1ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EC 10128 bytes
SHA-256: 88e56a23e74ec6716d6391cf9338307b9325e52551a6d6dbb76522f7ac814f06
font_01_sfnt_off000108a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A6 17328 bytes
SHA-256: bd170b896c4e6222677fb8c396206a34363531c8d20d82eacc16e3e1d713440e
font_02_sfnt_off0001355a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1355A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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