Malicious PDF — malware analysis report

Static analysis result for SHA-256 6551360bc6f8e8c0…

MALICIOUS

PDF

68.9 KB Created: 2021-09-20 23:53:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 059ecbcb46968d7b0d6cda4cf8ea6291 SHA-1: 07a9cc17e1734eb32e701d3991d51f38fc0d12ff SHA-256: 6551360bc6f8e8c05f972d1d737f4f8008d260b18409f2cd70908794902a82a5
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress uploads and other disposable hosting sites. The presence of 'utm_term=download+more+languages+android' in one URL suggests a lure to trick users into clicking, potentially leading to phishing or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=download+more+languages+android PDF link annotation
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/13054388737.pdfIn PDF document text
    • https://www.znackakvality.info/files/gukorosozaxexitupubuzed.pdfIn PDF document text
    • https://fitness-sport.it/userfiles/file/69051138358.pdfIn PDF document text
    • http://kozhencherrymtc.org/userfiles/file/borozasiledozawolil.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/29913903626.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/joralosurifapexovikapigo.pdfIn PDF document text
    • http://eko-uklid.com/files/file/miwitazun.pdfIn PDF document text
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/85443814222.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161411a7565e17---pesageri.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/fopozatir.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/161356ef1dd19f---8792825606.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161484f05d7c7e---muliruzux.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/tuxirugezegen.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/10932736173.pdfIn PDF document text
    • http://rosg.net/sa_upload/userfiles/file/20210918040639.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8d8ae3bc4---25490023159.pdfIn PDF document text
    • http://solo-reisen.com/media/images/file/90763858261.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/jixumerunum.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///jukurixokegowopod.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614422f18f81c---71688133278.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/2d3c3e2434bad7214c52d0a16cc193d3/99703687343.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16147e0654fd43---68132426855.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/garobibobefovuged.pdfIn PDF document text
    • http://krupongs.com/images/file/17260746275.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/1624984101.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_off0000b23b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB23B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA4D 14292 bytes
SHA-256: f30911eb433e74b9cfd1cb581f6ee0c2e7eb2aaea77e563b5a5541deb2eecca9
font_02_sfnt_off0000edc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC0 10680 bytes
SHA-256: d373e8241f9d3c6030a129391476071a40dd807207545cb802a9bb7b04966fb7

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