Malicious PDF — malware analysis report

Static analysis result for SHA-256 808cb6f5ca5dddd3…

MALICIOUS

PDF

93.5 KB Created: 2021-05-01 01:15:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 00e029b4400e0a510ae455e749061b6e SHA-1: c821598a5d93d244cf6492c08d805b8c1feeafbd SHA-256: 808cb6f5ca5dddd30f8683273201c8d822b3cb95276f5ef2b2ed4c84b6cf7c70
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/df04d228e24415f40e0caaa98ea7c4fb/82734406327.pdf In PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/rdjmrj2kblmtbsa0b9au701c1t/20346004356.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/c580cdbf0c232710ebe054340203437c/vuvabetedekidewabeva.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/bd56bcd50908cf6ae87f506e29ab032d/kiridedulamipiwoduzasud.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/37052411dabac26a63d3eb39cb2ccfd9/38575086251.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/4c1cb51c6a2460ffa88f8e594a17e2d2/99306525079.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16078cb33872d6---92652316362.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/xozajowilo.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b47d74f395cae30b18315e10c20bdb2c/babuzut.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2d8dcdd93---90712245770.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e26206d2c---nisasadevugoxefawebe.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160857b370b7dc---watedoxewubow.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606edaaddaf4e---6361023961.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/f85d883d14c5cf38e518aab53c8279c7/rutuzelodi.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608305166bbd7---28409916874.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6515d7eb0---dogifefap.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6207d1fbc---lawal.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=hypertension+guideline+2018+pdf+%25E0%25B9%2584%25E0%25B8%2597%25E0%25B8%25A2PDF 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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000fb5b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFB5B 17016 bytes
SHA-256: ad4a4391279a833582ff7fdcddf8f4ca32a5a516a0314a188d113c734c17e916
font_00_sfnt_off0000d814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD814 5584 bytes
SHA-256: abd9f3677a216ca7eafb38286f06a5386f97e8e20f958cca1a0b6c43a2bf8550
font_01_sfnt_off0000eb33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB33 6228 bytes
SHA-256: 5be5f0322c98a35acc55a956f2ccb4c48cb8f18c502ad166c7ac80bc5ff749af
font_03_sfnt_off00012ae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE5 10316 bytes
SHA-256: 37b59e2d9db83df93a2b6161db3c93e3e298846612c5daefaa367b5da0e54abb
font_04_sfnt_off00014e58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E58 16368 bytes
SHA-256: f890c55e1edb843fa0180e6f97d13c3b135131217c3093ef2a1c97e4a0ad5c3b

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