Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6c59f86a0f526f3…

MALICIOUS

PDF

92.3 KB Created: 2021-08-07 03:09:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 71c41bbe69920edf9c17223d158709ad SHA-1: 78eb580c1f91d77bdefa7f90e63c55ed883efc8d SHA-256: d6c59f86a0f526f390f7544c60fec44e7b1eb11484253bd5e7f7ec84f143989c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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 https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/cc3fb90d7653f28c3f0bb1c2841fa7de/65561983430.pdf In PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/04c37f56a89714d516adf88f029133a4/43718268560.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/wemitusebomezew.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0441e6b1f4---jojinolibodilifakazego.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc26e95284---remomududazagalezejo.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/turenodejosaxese.pdfIn PDF document text
    • https://heyratacademy.ir/file/98198001066.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609c68270c713---nufelagovaseja.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad639d4e301---povixo.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/3340664329.pdfIn PDF document text
    • https://efnnma.org/files/file/kazuv.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/xoruneroxonobi.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/dee1322f56a7e45c4001f50e2327ca72/40959605525.pdfIn PDF document text
    • http://lhs60to70.com/clients/3/32/32806278e47d7e4d905c37b1d6ebf04a/File/nizikorerepij.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606dfdbd64460---98989701373.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/88558012064.pdfIn PDF document text
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/28090399515.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/4a923ccf3d7b4804d8e398573cdf5fdc/repudetujumakun.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/tugoguruxazixazovis.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/1120783146.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/cms2ifvd2mk5eb7hs7bb32jmao/juzixumogugoru.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/sidasefulotuvok.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1236f4a075---difasasa.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/23984027210.pdfIn PDF document text
    • https://nffcd.org/userfiles/files/jixavazikuxuv.pdfIn PDF document text
    • https://capecoralliving.com/media/file/22659263004.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/36700388199.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=can+you+play+among+us+on+pc+with+a+controllerPDF 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_off000102cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CD 17308 bytes
SHA-256: 3916edc37132b64c21b6cff151d32eb9f5621c814f2aa98c9140eec288b9c699
font_01_sfnt_off00013002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13002 11152 bytes
SHA-256: ff17211438f27c753ecbe9387e40ffa3472bac30a40d947b8a7b4995e42df40c
font_02_sfnt_off00014a02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1