Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2c322c0c0519386…

MALICIOUS

PDF

89.5 KB Created: 2021-06-30 18:50:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8246a47a1a63d26ea20666e204c83b64 SHA-1: 6e5a4d973b35802cdf198a6fd2938eba32ee707b SHA-256: c2c322c0c0519386dab6d0a42da0c4f2065b5c0ab1482ba721d0e10e78048d9c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or credential harvesting attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, further supporting a malicious intent. The ML classifier and ClamAV detection strongly indicate malicious content, likely a phishing lure disguised as a software download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://crysiq.ru/uplcv?utm_term=lightroom+classic+trial+download PDF link annotation
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/c051bd30983761ed3e3e979c33ffeff6/65501097594.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/faarhg3gtcno77s2d1roqgl7v1/48652844512.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/29883774314.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/pedipewawezexusuwofapaj.pdfIn PDF document text
    • https://realschoolspirit.net/scauserfiles/files/gasewodipi.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6481300a81---rujul.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/67c835487ee5ef4dec4aaef6ac1d2385/56975513234.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/vegoj.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5fc8dd064f---kosusin.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/96231a2de6d67fc9022c6799d04eeba9/24200718722.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/fcdba5bf75179a462f5ab461922bc3a3/76644168991.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/5291167599.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16093a543b820f---32891087874.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/f0677a4d153593ad8708110878e6d18e/mesugunupafegewukusa.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/fuvisiwolumuwe.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/6139808213.pdfIn PDF document text
    • http://schooldistrictservices.com/clients/f/f6/f6ab1571d2cdf5e569af7b76e288b17c/File/73014954720.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/166uiamib1k28mkstm3ae6gj05/65993574378.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0cb7b7755---41743082858.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/5b95ef15b4d8ef5484722b0961f5fda0/dukemu.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607538008e626---lusobujagugo.pdfIn PDF document text
    • http://weingut-suppan.at/files/69988545154.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/60118980273.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/obmc1dcbm3b95rpmglchr81nt2/69439376727.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_off0000fa78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001128a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1128A 17584 bytes
SHA-256: 62c74a89269306ce6f687945377f42ef80a9304abf73107f728ee370821dd1d3
font_02_sfnt_off00014093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14093 10728 bytes
SHA-256: 5cad71f968cfb53287ab05e045e1f802a9add9a7802418d47111596f61b1dc97

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