Malicious PDF — malware analysis report

Static analysis result for SHA-256 2189c5e72d2ce919…

MALICIOUS

PDF

79.4 KB Created: 2021-09-08 10:17:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d0e12958c6e40685492b52c42bff668b SHA-1: 3122b7d92f29feb98efd1e45ab24b39920c4e6ee SHA-256: 2189c5e72d2ce91983969031ac7153a1a0503d08c9433d600743479fd7f5a2ff
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF document that contains a high number of external links, many pointing to compromised CMS uploads or disposable hosting. This behavior is indicative of a phishing or malicious redirection campaign, likely intended to lead the user to a malicious site or download further malware. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://pistant.ru/uplcv?utm_term=addition+worksheets+with+pictures+for+grade+2 PDF link annotation
    • http://www.jucadent.es/ckfinder/userfiles/files/tizapikarakabelo.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/i5o5ec51biqjtha1hsubnr4gc1/25793501630.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115d16f67a47---91414767497.pdfIn PDF document text
    • https://panama4d.com/contents/files/bapunebulapinuxorodipopeg.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/vulizi.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/564e0a0eca198ff4849a911ddf985d59/12387231569.pdfIn PDF document text
    • http://igorodstore.ru/files/userfiles/files/xanipubobuguvedi.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/kopajanepawekupomobaw.pdfIn PDF document text
    • http://majesticcaliberenglishlabradors.com/clients/a/a7/a77fae3751d16767b5fd1969bdae34dd/File/jomidifewatamebo.pdfIn PDF document text
    • https://hagepoorter.be/files/files/delunevenerepo.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/tirokujifa.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/xezoliwolufosivimapop.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080fd7274f89---76532081894.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/468d78eaf1d1312a34ecb02157fc5e78/vuraposes.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/61609011669.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160e819c90c8e9---52556444310.pdfIn PDF document text
    • https://circolodelpistone.ch/userfiles/file/18203466335.pdfIn PDF document text
    • http://benhvientantao.com/img_duhoc/files/38017069337.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/pujavarajemiwowivamuka.pdfIn PDF document text
    • https://dintek.eu/uploads/file/7397527137.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/48961122025.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/61781049824.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD485 11232 bytes
SHA-256: 1dec28dbc0c688ab371f34cc4cad6ef2d3176cd7a834d393bdcce2b68e481327
font_01_sfnt_off0000eec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D9 15896 bytes
SHA-256: b44d381db012516616b81755a9b5b37006ac5f6bf32410e1ddb83a1044cdafee

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