Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7455a0217b4c6be…

MALICIOUS

PDF

71.0 KB Created: 2021-10-01 10:00:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 205f9384f1543863adbc9afe3d4e6398 SHA-1: 97eea192dadb3cc2a7fea03ce93b849b9d2d8b1d SHA-256: f7455a0217b4c6bea7d8a50f0dcd0486c01be2c16e7472533ed11aca22b5ea95
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which are flagged as pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and link farm heuristics point towards an attack pattern designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://marikakozmetika.hu/editor_up/2477687453.pdf In PDF document text
    • https://bselink.com/userfiles/file/fadikuxatito.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/24534481223.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/savapeviw.pdfIn PDF document text
    • http://thietkevang.com/upload/files/13615308336.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/witosa.pdfIn PDF document text
    • https://keyseries.us/userfiles/file/bunozenipugaga.pdfIn PDF document text
    • http://xn--elementy-zczne-kwb98g.pl/media/file/52383635265.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614735026f94f---tenojozorimujobibeki.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/09/01/97042097835.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614be30fb6ebe---nelutigakepujiwukuver.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/keziga.pdfIn PDF document text
    • https://ecohort.biz/userfiles/files/mevutiduvarisa.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16138fe4b0f6df---woxelasofusigagexego.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161523c3025db5---pirikaf.pdfIn PDF document text
    • http://msiutilities.biz/documents/gefitokolafututudanegux.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/nenigodifoloxobemagap.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/88670304058.pdfIn PDF document text
    • http://unleadedcoffee.cz/soubory/lutisiwebilekotal.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/30284608882.pdfIn PDF document text
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/39030535031.pdfIn PDF document text
    • https://cncunse.com/d/files/fekorujosoni.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/lvao3tqv9m6b4fpo26hntd97su/xozimi.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/pabujivozolasiworeni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=best+app+to+stream+live+tv+on+firestickPDF 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_off0000b328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB328 16148 bytes
SHA-256: d111f939f13577f2d2f9b956393fa1a434818455132358659d843c28a0e83857
font_01_sfnt_off0000dcac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAC 10852 bytes
SHA-256: 7f7c2954cf8a71c95535f86fb67334a967e32e30e446c69b4ead274ebbe05124
font_02_sfnt_off0000f5d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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