Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2fe7f4853997b34…

MALICIOUS

PDF

85.5 KB Created: 2021-07-13 04:49:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: fe11f02ce29c7bcb906491ba46085761 SHA-1: f1dbaf8e27cb2d40eabefd11cd5d3840606466c4 SHA-256: e2fe7f4853997b34ba0387e253f2efd4b36ea4d1acfc2c5945aee82fcc426f6e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous other PDF files hosted on compromised WordPress sites, indicating a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs are likely part of a tactic to distribute further malicious content or lead users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e10fd30701---69739360586.pdf In PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160a6084d2c558---46029019293.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160829bc9d502b---22667743834.pdfIn PDF document text
    • http://fenotropil.ru/userfiles/file/buxejube.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/97048199531.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7a542e05a---betuxelogatifip.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/47368658644.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160acb07ccb642---xifazeku.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/99003919685.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/12687363373.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/watosuj.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/98388106860.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f1d562c5e---gusipewusuzases.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/d3nvu0ln9t58ngd8dcb9l89cgq/pikefubijilegujire.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/22355089749.pdfIn PDF document text
    • http://leakefamilyreunion.com/clients/63964/File/9212444070.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/3e0085d5cdcf07a19630704886d38519/56184130503.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/ipi75kecitduq78bbsn78sps9h/69804910406.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160947841377eb---99558772514.pdfIn PDF document text
    • http://www.toeterloeh44.de/files/gupovowepototobevo.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608862e57070e---ladaxinudikeg.pdfIn PDF document text
    • http://cnzgks.com/userfiles/file///zarekutipefaw.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/p7rfl60lm4kav91ta01v3jhqi3/71028226315.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=where+to+find+network+security+key+on+routerPDF 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_off0000e9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BD 17592 bytes
SHA-256: cb7c6237dc50ae896a1fb13d7c8b25f19c305caa949d3ddd9fffdf80a09af181
font_01_sfnt_off000117ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13003 10752 bytes
SHA-256: 9f9262fe52cff052c2a036808be04cc07e7ad41a81aa18098f0588ce57b75b72

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