Malicious PDF — malware analysis report

Static analysis result for SHA-256 82c3b3d7aa247ea3…

MALICIOUS

PDF

91.2 KB Created: 2021-07-30 16:36:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 99a641d13bd67bd6b7a9d892cc8c3406 SHA-1: 9dd30170bae7855b9b8b5a4420d4466459a1f9f8 SHA-256: 82c3b3d7aa247ea37f00785252defbe3abcf066f420f6a7ace48124411531554
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and disposable hosting. The primary purpose appears to be directing users to external, potentially malicious content, aligning with a phishing or malware delivery strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://queure.ru/uplcv?utm_term=hoichoi+mod+apk+latest+version+download PDF link annotation
    • http://pkynfe.net/userfiles/file/59859959055.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/lou6p3ma6e7q6asq2glr8lr3c4/16382245047.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d58123d53---nerefetofiwuzolojoledupul.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c70dd0b34e---dinofekazilatefofaj.pdfIn PDF document text
    • http://webinside.pl/userfiles/file/47781932456.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/33829841994.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/46960408135.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/90d1642c1cf46ab53ccf41b8bd5c18aa/7139966428.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c76d8412efb---17247175737.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/86cb33f65d5d65e8ff24d79e0b2160b1/dedebegagikuwotefodupane.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/5f5bacec47ccbcea420b543ac00b6d22/gosimukizosu.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/zarolasa.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/9f71e8bbfecb8a6953fee80b4c0c1e8c/953608322.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/8fa06b59c5f59ac86ef8755bc5b7cd1e/tawokibikoxuwalunezaxivo.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608672a29206c---4274732546.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0546859d8b---54532913208.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/17ufiasttkeqfcggm4nk9pfaq5/pofivexudaxasezufo.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/c41fd21c9449eb48a1864992d69522eb/25335403226.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/5o6d0h9bq65ct5ps2sc7rprj5r/gadalurizonunudogexizab.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/ea5400582fb94e49ac04d86b63079c5f/farasanumirobesatewufik.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/91764966800.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608954d7d8b39---wewowemipijodoxixuv.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/zejimoxukep1626504798.pdfIn PDF document text
    • http://mastersequipments.com/ckfinder/userfiles/files/mawaxejexa.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/juzuvijuguwi.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_off0000fdf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF8 17768 bytes
SHA-256: ccad3fb601b0430c1bf2fe315ef279bb0d1f6f0b3cb7954176eac93e243c7339
font_01_sfnt_off00012cac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CAC 11016 bytes
SHA-256: 1741ebbd0239f024f96965ae043af37395516f01938d570d82873e6424e7fa82
font_02_sfnt_off00014625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14625 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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