Malicious PDF — malware analysis report

Static analysis result for SHA-256 938ec70656bb90cb…

MALICIOUS

PDF

91.2 KB Created: 2021-07-06 12:47:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 8a4f98498b11299c078c8334a758e704 SHA-1: ccf844fad5c5c5e2522f2f1846dc4f1a5e5e9bd8 SHA-256: 938ec70656bb90cb63db74fe7c634f29036740c844897209619d8518fcab6919
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, but the presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution attempt.

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 https://alshaabcoop.com/userfiles/file/55736610004.pdf In PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ecc0db6cff---josatorizo.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c77255603af---xakekor.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/wizeg.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/2234411044.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/19134312190.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/75745067960.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608333a3556c8---49202238929.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/bimivuvateromo.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16088831351806---36529166214.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c611b33d24c---mumurop.pdfIn PDF document text
    • http://teraval.cz/res/file/xotesakara.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/90a507765364131c026e14a80a262103/71367550878.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/terevawofexulejig.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160983afcaac30---83302305328.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe1b5ec6a7---xiwawalenalejazuxalejewuz.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/7stctirhk4dedrk87lcvl3it29/7677060625.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/lazisagozanojubujal.pdfIn PDF document text
    • http://atek-ent.com/upload/file/pirigupaledinonejumad.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/soxukaxebowujoda.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16082115faee45---fofebutovobiroga.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/0d776f38e15112b5f5ac13d84051e94e/94110014771.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=school+mission+and+vision+statementsPDF 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_off00010166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10166 10676 bytes
SHA-256: 588500fdeb0ec46bee82280af83e517b8f74a5d027da20f2b73111bfeb7e9565
font_01_sfnt_off000119ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AD 17520 bytes
SHA-256: 2e44afe4385d7cbb816d9eb3b4452ec515d818ad31ccd446b138d5ed19e0f3a1
font_02_sfnt_off0001479a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1479A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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