Malicious PDF — malware analysis report

Static analysis result for SHA-256 899485427a3f24ab…

MALICIOUS

PDF

152.8 KB Created: 2021-08-18 08:57:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a4e835336a82912189516ba7525bba99 SHA-1: 0751177af06c0646ba14e5b770ca124c3fa2e3a8 SHA-256: 899485427a3f24ab9ba0a5e43e03cd54e3c4eb7de7c09e135ef05509e0e11c1c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised CMS uploads, suggesting it functions as a link farm to distribute phishing content or malware. The presence of embedded URLs and the nature of the heuristics point towards a phishing or credential harvesting attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://garglob.ru/uplcv?utm_term=gordon+ramsay+ultimate+fit+food+pdf+download PDF link annotation
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d23e944e82---25880275660.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/6d4624822e6670ad2b818ef606ccb23f/vowolinexegepaxoduka.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/vumodotudi.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/rilofixeza.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/77607569658.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/57135585364.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/xikadosuzed.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/76b2b2085892ab288902dbdc3409e0c0/72661422176.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/9ecf8431143aaf06f89102d3d1028827/sirasifirisuze.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160c184dc79917---27210705583.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607223f7778c9---94119689181.pdfIn PDF document text
    • https://manhremhoangvan.vn/wp-content/uploads/files/86272422160.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/6844981134.pdfIn PDF document text
    • https://iword.de/userfiles/file/91995579262.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/92962585684.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1d7d4e98ac---vozuxo.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/vebewa.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607a955c58963---xobosasavarizuwinususefu.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/e8c3838435d3fc23b89e3734b61095fd/62698072019.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/guxabagokemidasopexuvabik.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a2a4abad1f2d7fb4885d797c69c5f00e/fudukanijew.pdfIn PDF document text
    • http://epoetryworld.com/clients/53741/File/4878534583.pdfIn PDF document text
    • 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_off0001f1b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F1B8 19028 bytes
SHA-256: c0491b14a8a4e907d4d7c7a64cb1d284bba3fd4acb77d94a631197585220fe1c
font_01_sfnt_off00022347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22347 10996 bytes
SHA-256: 1d31bfc97ab21bee752117520d4cc78e1d05368a55fd72d7e2398bec6c7e153a
font_02_sfnt_off00023cec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23CEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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