Malicious PDF — malware analysis report

Static analysis result for SHA-256 835a9e7daaf5b33d…

MALICIOUS

PDF

83.5 KB Created: 2021-07-25 07:42:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: bbdf5bfc0462c00846835766b3510ff9 SHA-1: 008976f3b5d921eeb285b8a9ac4f64d618a006ef SHA-256: 835a9e7daaf5b33d3ddda90b119d3acbc6483389cb7072e836dfcf3f7194f87c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or directing users to malicious content. The presence of multiple external URIs and link farm heuristics supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://pet.nfe.go.th/m_site/ckfinder/userfiles//files/68195244360.pdf In PDF document text
    • http://hongdanhaudio.com/luutru/files/1427476940.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076cc90cbd8c---wuwawemodavekuro.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c80a2cab2---pinefilum.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/2631982536.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4836e56a0---jegivaralijirukuwepotak.pdfIn PDF document text
    • http://dafangtour.com/fckeditor/userimages/file/11105254395.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16077d84dbfd14---kokozasexix.pdfIn PDF document text
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/73931f2d70fc1a5fbf828c750d41a5b2/50526758007.pdfIn PDF document text
    • http://altinay-law.com/images/file/12021431850.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/11357003526.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/6a95758c05019fea688c9bc4649b87e5/baribokatubekopufu.pdfIn PDF document text
    • http://goodwill.as/userfiles/file/48413794055.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/70fu0rosc4c56qvqe3p93ghjj2/jobopotijobiraxasima.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8ed362873---5472931963.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/2222365249.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/nixidowatoxuwibawinerok.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c9168705936---fadokodizininoromuw.pdfIn PDF document text
    • https://petala.gr/userfiles/file/tatumekumivogimi.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/pasefaritagad.pdfIn PDF document text
    • http://rld-carbon.ru/file/30420543456.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/mirifuwemiwen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=toyota+yaris+2008+owners+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_off0000ddf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF0 17608 bytes
SHA-256: 535db552df440c224584138d27e9eab877692d5f87db441d97007f7a13c1818c
font_01_sfnt_off00010c4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12461 11372 bytes
SHA-256: 2f5a3eaf6d181e508e1a61123c8c504620d08060ab3a0aff35aa4d86078ae93e

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