Malicious PDF — malware analysis report

Static analysis result for SHA-256 63abc9a563af3aa2…

MALICIOUS

PDF

81.2 KB Created: 2021-09-19 03:27:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 09d22553bf10e3405f28eddcb725c849 SHA-1: d0c45974a6306d7b89414d25014e20d3c82ac15c SHA-256: 63abc9a563af3aa22ce40f208092c375df577c1a7cbe1f2298aa08a73f4cd3c7
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lure users to malicious websites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://thaide.org/userfiles/file/72620951517.pdf In PDF document text
    • https://etravelbox.com/scgtest/team-explore/uploads/files/vatekoxalonokifojazuj.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/59872314435.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/161321447d2c01---58792263673.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16141a766ddbf5---82365763137.pdfIn PDF document text
    • https://xn--pssa17sw71b.tw/upimages/files/nikameselivafesivezoruned.pdfIn PDF document text
    • https://tsegypt.com/file/nulufapij.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/jibaxe.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16135f45e4daef---14649123396.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/e05ec321a15586d65df32b95461422e7/lijotejugemi.pdfIn PDF document text
    • http://st03.it/userfiles/files/48756890546.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/6751009755.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210916_242EF264C342C3A3.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/29292893113.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/fonexoxadatit.pdfIn PDF document text
    • http://autolavaggiocraparotta.it/userfiles/files/gimaxevoxi.pdfIn PDF document text
    • http://objets.immoweiss.lu/userfiles/files/mederofisipapudevisezi.pdfIn PDF document text
    • http://servmed.net/userfiles/file/porisilenelixezixiwoxi.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/51b4f27156cfe530a79e03da5769677f/venavaxexeluxu.pdfIn PDF document text
    • http://e-motyle.natura2000.pl/imgturysta/files/78100532220.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/7369d712447d6a56317e86c88f2c938d/59504975685.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/10809536719.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=mp3+music+downloader+apk+for+pcPDF 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_off0000d6b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B1 11128 bytes
SHA-256: c9bfa2ec7e9c59b834dbdbeabad248d0b8bf6684ab4cc7237f61969d142234f6
font_01_sfnt_off0000f0b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B5 17664 bytes
SHA-256: 3f4fb0a41a808e1b06daff33cf58a7cbd7f9706f320b22e8c62852a9e5e1856d
font_02_sfnt_off00011f17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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