Malicious PDF — malware analysis report

Static analysis result for SHA-256 f76325130553ceb7…

MALICIOUS

PDF

82.1 KB Created: 2021-09-04 23:02:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5ba4ce89b3130a19a22c3e7439cb2f82 SHA-1: 4b8853af7644681af6303b9f16741f30507024e0 SHA-256: f76325130553ceb7725c0270c3ed7f706d73f94e5680f38ba95704f259e3f671
196 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content. The 'SE_CLICKFIX' heuristic suggests social engineering tactics to trick users into executing commands, further supporting a malicious intent. The ML classifier and ClamAV detection strongly indicate this PDF is malicious, likely serving as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743cf2379a5.pdf In PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a78fcbca022---57164738736.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/eaf4e0a57645d597f9f8a83c1486109e/98579702271.pdfIn PDF document text
    • http://7tec.ru/userfiles/files/ruxulunodipozifupubalox.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/84639433713.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/wosevurijilidajupoz.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/61279259348.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/8acf0b7894f3f8a359ecfdc8e2a38600/fukujoxif.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/306b5d50da0e6d159adaeb11a501436f/76611427069.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/zexij.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021081913324532.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/8ddd1c917cbfe4992178259ac297b92c/38806592583.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/gijobivularaxulapejokex.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/09888tdidnpbmp52pmval3ub22/21212100845.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/96377679684.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/bixotudivenawijodumem.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/2466847086.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/4e20b789f4d33055c4418f2898981119/27028033186.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a8547359b80---87569355452.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/52503be0305dce07a54d41d64582b9d3/28511194411.pdfIn PDF document text
    • http://ewinghighclassof1963.com/clients/e/e4/e4cb61fc1babc639533983e887b7272d/File/fupetabubulitawuzotut.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/wunusu.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/59995280046.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1611b196ca8d3a---refaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=file+pdf+tidak+bisa+dibuka+di+komputerPDF 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_off0000ddf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF4 17280 bytes
SHA-256: 62e5b22b651277d7e43f183a22204495d5f601a3a36f9701215fde5f38c45845
font_01_sfnt_off00010a0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0E 10864 bytes
SHA-256: cebb20c031c019be8c6d51b16781928e6bd2ecdad25fbefab7953b91fbd9551f
font_02_sfnt_off000122f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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