Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d5c8b95a683377f…

MALICIOUS

PDF

75.8 KB Created: 2021-09-18 11:46:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 06fef79c1cd30b9003b72c5ebcfb0964 SHA-1: 2c6ba111774e061988fe31ccd74b5d007ad548f6 SHA-256: 5d5c8b95a683377fb820d260169658788fa2616c7c86ab4a8640da72adfb02ce
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The embedded URLs and the nature of the heuristics suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://medvor.ru/uplcv?utm_term=game+game+game+a+jaaye PDF link annotation
    • http://spc1991.com/ckfinder/userfiles/files/84192789391.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/safebavotenukovujij.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/vfglel33q5i1tshujn91lths10/tigimel.pdfIn PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/34511514697.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/74300156788.pdfIn PDF document text
    • https://mimpishio.com/contents/files/37997773394.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/62142821082.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/55001283482.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/napasupagom.pdfIn PDF document text
    • https://812423.situshoki1.com/contents/files/4419164886.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/70633491784.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/konogawiriridabuvuwedexu.pdfIn PDF document text
    • https://odontologosmalca.com/images/userfiles/file/mugazibisuw.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/genasobe.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/4098271770.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/nalekemu.pdfIn PDF document text
    • https://resicolor.com/upload/files/kaforudawigesetolajo.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/e5651796c057ddc7752d220e2e5f9c81/reneralav.pdfIn PDF document text
    • http://mesterteto.hu/userfiles/file/diraj.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/60232239434.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613865e99a5a7---lujelemisuvarufusev.pdfIn PDF document text
    • http://canoto.us/Images_upload/files/jaximoxigamatifeluzoraf.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/bikiwikidujujorejalumeb.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/10877956536.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/35180290373.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_off0000c78e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC78E 10004 bytes
SHA-256: c4783b5c82fa365fac35b547f018b31884357d32709788f5b33a30edd5888b3e
font_01_sfnt_off0000ddc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC5 16832 bytes
SHA-256: b6c0eec1f84db2af0017477a78aee7f5aa5d5ebb8b7a90af1a1cad7f008b1274
font_02_sfnt_off00010955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10955 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1