Malicious PDF — malware analysis report

Static analysis result for SHA-256 87c7f1f4e823a549…

MALICIOUS

PDF

119.3 KB Created: 2021-08-14 09:30:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 118103ab9a462234972d9fa9f038d517 SHA-1: 2e5c74bc04f29a704b5d32907716f8a414183d9b SHA-256: 87c7f1f4e823a5492554abc937773a547b27dcb83a5dab98410a9266f0ae98f4
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The embedded URLs are likely used to redirect users to malicious or phishing content, potentially leading to further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b65ee903bb8---bizokej.pdf In PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/48340803584.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/p3d6mb0lqjiu42j73ilh93c4ur/kujomibotolejekutotarores.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/napuzaxeduvomexudavu.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/gql9dkpjnf19u6sd984f1pfjtr/pomupofamet.pdfIn PDF document text
    • https://sayurmateng.com/contents//files/7586153264.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/nopil.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609be4e78625f---2612180659.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/wunatitinaxipoz.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc438b5c1a---sadun.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16080791acd6e7---bamopugoxakuboge.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/d87b7657b07afd78fabd8e27250db41f/11774591811.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/b02q2qfmema8pkvvphjdlqln2q/ribowepem.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/aa0a4e67b6c323b1387406aadb6ae7ab/vumusu.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/8f95037abb20d77679413683700c1885/92900683519.pdfIn PDF document text
    • http://babamoleskine.com/files/file/zagivexa.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/bajateke.pdfIn PDF document text
    • http://polloricowings.com/uploads/files/15725097006.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/riguxawumawup.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f58a33d20a---51343287901.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea4961080f---vazokose.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bada56d3cdf---30576635555.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/13730465707.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3887573881---45533448896.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775c0773f26---jurako.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+get+better+at+combat+in+sea+of+thievesPDF 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://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_off00016fd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FD2 11020 bytes
SHA-256: 8e0f6c612489bb50f1e4f40e684f1ba1d2cb377e9b6ff8ccfc379accfc0fb93d
font_01_sfnt_off00018958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18958 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a16a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A16A 17904 bytes
SHA-256: 8952676c7f4e93cf4ef0cd453e9220bb4c9304a101b3c1f9f003191ae60a1780

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