Malicious PDF — malware analysis report

Static analysis result for SHA-256 16fbf8b65a98a945…

MALICIOUS

PDF

71.5 KB Created: 2021-08-27 23:32:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: a98a7aca4c17a39b85abb881727c68ee SHA-1: 4f87e2be5a338bc792c7a8f2b17c26277a6d39e3 SHA-256: 16fbf8b65a98a945dbfae52e9d25cf88998c3312bdde57bb81122de454d0d341
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://chandravanshi.com/userfiles/file/66714543750.pdf In PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a18c5ca33d---87580795026.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/vapixiniwafevesorejetobor.pdfIn PDF document text
    • https://allianztc.ro/files/file/xoberedegimirubu.pdfIn PDF document text
    • https://clickbox.ro/images/file/mereranowuw.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/vibopojukodituvosi.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/36083135605.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/baxuwawalupaxumabagoronof.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/eovspkfbbkjgh1jtjjdoocjroq/migiguwolejum.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/mobatimimuvefep.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/52fa34361b6cb5b057ed257624bf9b3e/digegukosagakuri.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/c51e5362326f20145b3e49e549b5fe51/91419246725.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed0b93d575d---71588052214.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/nq62v6c0qfl61codnv3mp9b1b5/nusepatesupiwure.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/74447154658.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833dcbbeba2---kumedogazapeladem.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/62356880964.pdfIn PDF document text
    • http://35ct1.com/images/ckImageFiles/files/zanumigodegin.pdfIn PDF document text
    • http://gyobel.itpublic/file/jazugibaxobutitajoveluge.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/97045593525.pdfIn PDF document text
    • https://djecijagarderoba.me/userfiles/file/fijosoti.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/kedix.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1611c21388af1b---49174073728.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/71423466994.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=words+starting+with+verPDF 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_off0000b917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB917 15412 bytes
SHA-256: 1a15f5a8b3a0c69a1f4a6875ef15b2e578c8a2d17867a46973ff4c65bc69469e
font_01_sfnt_off0000e06a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06A 10628 bytes
SHA-256: 434bfaf44b674f3a1660f6131fe9ae3a137a4e9dcb6e69d8aa0f4720f4dea6d8
font_02_sfnt_off0000f886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF886 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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