Malicious PDF — malware analysis report

Static analysis result for SHA-256 89005513c5e3d4c7…

MALICIOUS

PDF

85.3 KB Created: 2021-09-10 16:58:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1d1cc65f6629db5a95382ad2b9b24efd SHA-1: fc849ac9fb77e843dd0a833e9eebefb91d9f1c24 SHA-256: 89005513c5e3d4c7ad64d6a947b1165556a9cbbe4751d5554884518e7e09a134
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. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users. The presence of these links points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://gartenmessebau.de/uploads/files/74277953673.pdf In PDF document text
    • https://muzpony.de/obrazki/file/90731719695.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/96959007784.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/73613039637.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/55327786902.pdfIn PDF document text
    • http://gutachterbewertung.de/userfiles/file/17226306636.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/kqb2bql4e9qeb2e0gosloaab34/73189244726.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1613af89c2c3ff---jopeladadegukes.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/24885940481.pdfIn PDF document text
    • https://beamstraffic.com/amb/userfiles/file/julugipoxawu.pdfIn PDF document text
    • http://avandcie-energy.fr/ckfinder/userfiles/files/xabebi.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/36f103e539bedddf8ec817b985bdcdb3/95829433207.pdfIn PDF document text
    • http://xinge168.com/uploads/files/20210908072401_301491.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161383a546cecb---18568779999.pdfIn PDF document text
    • https://duhocblueocean.vn/ckfinder/userfiles/files/34598494099.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/62230274818.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/44472408.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/97039020842.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/41791920715.pdfIn PDF document text
    • http://xfswchem.com/upload/files/titijizajixiduwu.pdfIn PDF document text
    • https://computerzone.pk/file/lupewenixugako.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/godowidezuk.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393b2a2011a---49087806640.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/81283521002.pdfIn PDF document text
    • http://peter-crooks.com/userfiles/file/luzibujojimi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=vbl+app+androidPDF 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_off0000ea16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA16 10096 bytes
SHA-256: 0d41ef412e8d0a743464175170f4a993df2bff5b57622eb4c587c0ed63c54d51
font_01_sfnt_off00010052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10052 18292 bytes
SHA-256: 2b7673a42b3a6e7ecab29dfd13002c7bc8d251f30b2249c1f8fd3b192a12f7d7
font_02_sfnt_off00012fad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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