Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b0b5dddbadb3de0…

MALICIOUS

PDF

72.5 KB Created: 2021-09-17 19:58:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c0a13aa737e9a670838bc391a3fb8539 SHA-1: 4d0f8ea49d84fed4228acabdb20597d1cb46e9fe SHA-256: 8b0b5dddbadb3de08d8df3b471e3ea4c08845ab2caa11c6541b3bcd9bdf71b4c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS upload storage. The primary purpose appears to be redirecting users to potentially harmful content or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://bhk-aindling.com/userfiles/files/lakijigibepazegakugivit.pdf In PDF document text
    • http://yucehukuk.com/resimler/files/fonabejefojizopiwa.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/tazitopidasajunil.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-10/20210910083004988796.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/cb9d24f5fcf04f100677971e742ad4d6/nonupuvolusetu.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/30267199480.pdfIn PDF document text
    • http://pincesorvarshop.hu/editor_up/pamoxularijax.pdfIn PDF document text
    • http://acunambalaj.com/adenoto/upload/files/xadigewerozamotisogebisos.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/3llk46gj247vqlu8iuch372jse/wiweregeve.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/rosowurugodowapekebogudeg.pdfIn PDF document text
    • http://ydyb.com/filespath/files/20210907033553.pdfIn PDF document text
    • http://baltyk.recykling-rejs.pl/imgturysta/files/62099280993.pdfIn PDF document text
    • https://fcimoveis.com/imgs/file/65866768587.pdfIn PDF document text
    • http://midospa.com/upload/files/99673156367.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/xobalinurasagesokozig.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f42c79dd7d---gubulanobiv.pdfIn PDF document text
    • http://tion.hu/upload/file/69837483304.pdfIn PDF document text
    • http://eegbiofeedback-leszno.pl/userfiles/file/fisurodofolorejuz.pdfIn PDF document text
    • http://sparkpro.lv/content/file/15295624153.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff8ffc4f6b---jumejuwepejoxapepafiba.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/17925437432.pdfIn PDF document text
    • http://letsfinal.com/userfiles/file/girativebeli.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/pipifulewaxikirireniwomas.pdfIn PDF document text
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/josudukinabobasolixe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=ielts+masterclass+audioPDF 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_off0000b863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB863 10476 bytes
SHA-256: 2f0e413b1a56fcc86561063345a5f68fe6ae6da4d5db8fdff5d90fdd843d5be1
font_01_sfnt_off0000d033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD033 17724 bytes
SHA-256: dc57950d0b996a656635746216eede43bfff1b6908dd8fbcd54a0a0e22119246
font_02_sfnt_off0000fc5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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