Malicious PDF — malware analysis report

Static analysis result for SHA-256 211c4f831b19994b…

MALICIOUS

PDF

82.2 KB Created: 2021-09-13 21:57:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 45ff0eb4a0f804c7ed17ed78652ffebf SHA-1: 284e18aabb0f87ff24ae7136f41f17c40152552c SHA-256: 211c4f831b19994b8ab8d497a02a833e960e7ccee7e119a01a0a9601df829ac7
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

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 https://tutorbolivia.com/userfiles/file/guvudulajovakipupowad.pdf In PDF document text
    • https://dukupahit.com/contents/files/pokoja.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/dljmsum19nc5imk55ptcin3tlg/75022803013.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/92667288168.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/pobaxadufa.pdfIn PDF document text
    • https://sunridgecorp.com/uploads/files/202109071013467934.pdfIn PDF document text
    • https://ajambary.com/userfiles/file/40551364675.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/55484854260.pdfIn PDF document text
    • https://bizimpin.com/calisma2/files/uploads/80354287836.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/jinavubewiliwabuw.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/17441044853.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/14752334268.pdfIn PDF document text
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/sudolun.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/92197100231.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/39328254983.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/232a9ed96389bc096039baba8477eee7/duguti.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613037c7ad3eb---67557301248.pdfIn PDF document text
    • http://nikolalepojevic5.com/multimedia/file/legusokajejemedaliz.pdfIn PDF document text
    • http://airsoft1.ro/files/file/zidefesu.pdfIn PDF document text
    • https://fuze-pay.com/ckfinder/userfiles/files/xudemajesisepuvogab.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/76175765259.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/4ed5adea8205da9c3a30cfdddf1d682d/tegiwirigibob.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/38640814812.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210905000122.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/vilotexaxuvalapidom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=game+boboiboy+adudu+attacksPDF 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_off0000dbac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAC 17556 bytes
SHA-256: 14a02afd830ce791b7ba5e5fcf168725770c26d8a46f4f77488cbe43be897bb4
font_01_sfnt_off000109a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A0 10768 bytes
SHA-256: 79aa48d1f407921e920839debd8f34898e65f508c3ba90f90002c1bbabc496c2
font_02_sfnt_off00012284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12284 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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