Malicious PDF — malware analysis report

Static analysis result for SHA-256 abf9b79b08a2e509…

MALICIOUS

PDF

76.3 KB Created: 2021-09-13 17:17:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fdd5e955607d070c115d36f931f8d2a5 SHA-1: d72ea592bbe5714a98d822a742971a6b6c0f2554 SHA-256: abf9b79b08a2e509c368b0c9cdef8716204ec45648507f7762fda715cf444c6f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external URIs and is flagged as a link farm, indicating a likely phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity, potentially leveraging embedded JavaScript for further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://krisoc.ru/uplcv?utm_term=dream+league+soccer+2019+download+free PDF link annotation
    • http://hwayinn.com/image/files/20210910_092936.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dda4907151---75309923501.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/38100292830.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/a67d88a4b3eb238140199af8585bea17/62595017000.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/jugawofabilemotizefe.pdfIn PDF document text
    • https://equimat-cheval.fr/file/sedofiri.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f636f092c---vufosozizibajeguwojiratux.pdfIn PDF document text
    • http://sibzakon.ru/ckfinder/userfiles/files/zotix.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/3182116099.pdfIn PDF document text
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/junuj.pdfIn PDF document text
    • http://kursverwaltung.fit-n-essen.ch/ckfinder/userfiles/files/zokodukal.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613235471861f---96815618004.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/japuzipe.pdfIn PDF document text
    • https://luxurybaths.marblobaths.ph/app/webroot/img/files/87621120639.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/91282183611.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/tisameferi.pdfIn PDF document text
    • http://shiraz.sk/ckfinder/userfiles/files/93466567716.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/80579527158.pdfIn PDF document text
    • http://boldogelet.hu/media/mamavukesafimededoxuxak.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/7684347624.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/77734456423.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload/file/58011294819.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_off0000bef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEF2 18852 bytes
SHA-256: af03d0c7d0d7a5dfe4d578c0d6f9ebc55b4d3ed4ee75a181ac27f43d5657e312
font_01_sfnt_off0000f0ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EC 11276 bytes
SHA-256: 4020c607f1e864eb5e1117f906459ebe1829d982f97094473ddd98ea4ee944e9
font_02_sfnt_off00010b65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1