Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d506c2d64a34e16…

MALICIOUS

PDF

88.0 KB Created: 2021-08-23 17:08:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7fb429f4a159ae20ed94d50237ca6f7e SHA-1: 6d081ed12820b2a20ae2c20003c0d1c764bc5330 SHA-256: 5d506c2d64a34e165ab93efe5f4925c12a9ceeeaab9367a84d204acd978f5e6c
156 Risk Score

Malware Insights

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

The PDF contains numerous links to other PDF files hosted on various domains, many of which are flagged as compromised CMS uploads or part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic findings point to a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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 http://bogieclassof67.com/clients/71235/File/75635990682.pdf In PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/99810564085.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/wafonuxidukawivafepise.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa51034fb4---viweve.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/790271f6877173539b241ea16c5d472c/pajilosilarifegesidewale.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/lfe064nlnfj00llqq36jf4msr2/susimexu.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/6c8fd623ee6a58da17e97cd2f3c29a25/26576255384.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/rudinudus.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5de35fe79---fomurud.pdfIn PDF document text
    • https://gotamsui.com/ck_imgs/files/kotumovivigiletowerijigib.pdfIn PDF document text
    • http://aal.tw/uploads/htmlupload/files/vozipibesorozilasagetoni.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/1622562808198.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210625231932_113019722.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/u9oasbfvo6ttfeurcqll3nmot6/ruravegajor.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/8ic0i5p571gng0716j9pckcrh2/15740076497.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/jutofan.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/newaxutej.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d563bc7de9689341dbae4015d02bc8e0/wigenunowipiwozibusefax.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc071cef7c---gosoxavusifagufukore.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/vboffphpash9qa8u2rktid5q6i/56946398621.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa848b5a0b8---70834096386.pdfIn PDF document text
    • http://thecoferfamily.com/clients/7/78/7892d776c92a08c80f86ebc6236678d2/File/88144453106.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/95214637607.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160af73ea1e13f---14244549149.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ef3128c8f---7206071012.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/menururofala.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=beautiful+in+white+flute+notesPDF link annotation
    • https://mediaget.com/userfiles/files/21763302154.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_off0000f155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF155 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001096c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096C 10448 bytes
SHA-256: cdec30683c5a6bf69100118f4b2755d41e012441729d027d9b5efbe2d2ac91fc
font_02_sfnt_off00012122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12122 18056 bytes
SHA-256: e1adc3eb694fc62b1fcb6eb08e24888ac5061e189a265553993a6dc3fb40c58d

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