Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd945f6971e5f18b…

MALICIOUS

PDF

87.0 KB Created: 2021-08-21 23:21:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 65d49dd6e4e87e03864bf0c7a54a66f5 SHA-1: 1b2b748c6806c1b6a3c01730b526c8704785a089 SHA-256: cd945f6971e5f18b8c456fbb9203e5e5efc8d484d3d7f713ad88ee0891919a28
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The document functions as a link farm, containing numerous URLs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. The primary purpose appears to be SEO manipulation or redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://aclamerica.com/customers/CMS-IMAGES/file/86501813946.pdf In PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160dc6499e49c4---lajef.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/nuzopu.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/fdff7180f62cb8b21b1253e1af19698e/gaparamowadimamifagev.pdfIn PDF document text
    • http://geose.ru/userfiles/file/66974356831.pdfIn PDF document text
    • https://alula.com/wp-content/plugins/super-forms/uploads/php/files/20ae53ece6202f9d6c5bfe936a79a1a1/98853588139.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/8300106624.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/3vlm5gvajf4ug1c85guuhdh4e3/82629398582.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/31371991961.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/72b4349a7e3949f89acb30462879f7af/lirebasezosifedosovo.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/gopevijigutowobogeraf.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160974c7dd03ad---gumatojolanewuporovo.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c170c0b9c3---92433631178.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070873b58ef6---dubefizufunati.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/43203478707.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-5-22/20210522022141814174.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/2766374678.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/bupomanajesiwakezib.pdfIn PDF document text
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/21230495125.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b58f562ca49---74074796817.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/37432544851.pdfIn PDF document text
    • http://sibmetiz.ru/upload_picture/29548813665.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/xixazowezen.pdfIn PDF document text
    • https://tarsiman.ee/files/file/wigojis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=why+does+my+frigidaire+refrigerator+keep+beepingPDF 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_off0000ee1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001062c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062C 16744 bytes
SHA-256: 398c1f632f04cbfeb62e43ccc1c666153a8d92b0feb95dc9b5f79926e664c507
font_02_sfnt_off000131ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131EC 11240 bytes
SHA-256: be515adf83fec7a0e0bba02036cc73c5a2b9a360f837809dedc0468a1f5f32bc

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