Malicious PDF — malware analysis report

Static analysis result for SHA-256 6804eab5dfa9df15…

MALICIOUS

PDF

71.1 KB Created: 2021-09-03 18:34:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3ba2a0647b2db06965b1871238c11038 SHA-1: 2ddf43ebba950f994c4ac78a40ed75c0af8ce1d7 SHA-256: 6804eab5dfa9df15e13b7b8853644cce3cf8bdc3be876be85678d7aef13845f7
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting. The primary attack pattern involves luring users to these compromised sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://sanders-scottfamily.com/clients/26926/File/tugumilofefewawiwapibapex.pdf In PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/807d3f0d82e0e2d6ed08ee0d1a71c83b/japaku.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/31dc7a33f04f50820c29c61fceaf7f0b/77274893241.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/70833415407.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/r7khq768829doclgk1phg5qoq6/61859725946.pdfIn PDF document text
    • https://kaptenhoki.net/contents//files/pupazaralavojubizifamo.pdfIn PDF document text
    • http://hladonural.ru/upload_picture/47183418376.pdfIn PDF document text
    • https://atputasbazes.lv/images/userfiles/files/powijizorovazonamogikelig.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/97gfu450bjltfo508d0mjjb930/tewinukibiwitom.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a67333e9a---95734967939.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop//contents/zilugal.pdfIn PDF document text
    • http://cmtsport.com/pliki/tegazosa.pdfIn PDF document text
    • http://chayka-svg.ru/files/wupikumobof.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d246b0fa4f---lekopitevobogewi.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/33795099760.pdfIn PDF document text
    • http://esejsc.com/upload/files/jatixilivudo.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a51e94cc395---80878798561.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/90894843251.pdfIn PDF document text
    • http://hiddenroots.org/clients/19739/File/sojarokapemedik.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d550af35b---98266558148.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/4324e5f758fe4ea994f57c335b34b095/75976042994.pdfIn PDF document text
    • http://thedigitalscorecard.com/userfiles/files/47116562575.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/20652065734.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=ford+transit+connect+service+manual+pdfPDF 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_off0000b65a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB65A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE6C 15460 bytes
SHA-256: 7c2159740987779243f4998555611da7e04031c743a801ec4d845dc8d85c2092
font_02_sfnt_off0000f5b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B9 10924 bytes
SHA-256: 188bfb6309390c210573d0742226b82f1bd62ceb77353dad82be5665a2e85748

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