Malicious PDF — malware analysis report

Static analysis result for SHA-256 5db7cd8b801afd18…

MALICIOUS

PDF

74.2 KB Created: 2021-09-02 22:36:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 62d562c1ce634c22a4a291e6ce4af905 SHA-1: 97c4640abccecbc2e1a369840cfe4267c7868346 SHA-256: 5db7cd8b801afd18ba96590dff8153625c95c01640398062672babe9fbbd016a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous URLs hosted on compromised WordPress sites and disposable domains, suggesting an attempt to distribute malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs indicates a likely intent to redirect the user to a malicious download or phishing page. No scripts were extracted, but the overall structure and URL distribution are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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://jn-zhsc.com/upload/80810485446.pdf In PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/f90a252d01f5682990f9c3fbb3484a81/belasalobujogamubiwukuje.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/m7mc1sgi2n6rvu888f05n4ffpr/tozivulu.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/c72431e1a278a4cbfb010df979412987/dokiralubikopivid.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/b18389c5bc52cb7bd2988d1a0b32d30b/tisalekododexotakadafurib.pdfIn PDF document text
    • http://idevicesplus.nl/app/webroot/files/userfiles/files/bepelobinamederopoba.pdfIn PDF document text
    • http://stpetersame.com/clients/9/91/91902b33218228c9a3691be2563b71f1/File/xajudopetodego.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/jutipusiziwijul.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/pifepanaxuzojuseri.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/eca00705ad9679ddd974952df5f4992d/telitifolopetalanisulu.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2e083aba7---fodavamonelarololaxi.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab322ed5da5---lemirixepipu.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/kebolulep.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/17142766491.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/7426786812.pdfIn PDF document text
    • http://vienkiemis.lt/app/webroot/uploads/userfiles/files/tagewepapowaresuvekep.pdfIn PDF document text
    • https://jcpcdesign.com/upload/ckfinder_temp/files/20210704073150.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c4a659d7282---josade.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/mopizavuliwotovep.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087e48b0c4c4---ganex.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb7625682f---78639454308.pdfIn PDF document text
    • http://snypes.nl/img/customer//files/lakidupobo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=first+aid+usmle+step+2+pdf+downloadPDF 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_off0000bcad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCAD 10940 bytes
SHA-256: 06120e836a4a2903fbfc7f26ea03a708564d619284c6c17f0b57457097e4ed81
font_01_sfnt_off0000d619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD619 17228 bytes
SHA-256: a8da58fd10cc2ebb3c1a883e18194451cfab210c5936b939f65028fc679ba16d
font_02_sfnt_off000102ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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