Malicious PDF — malware analysis report

Static analysis result for SHA-256 817b5a9da7c562fb…

MALICIOUS

PDF

85.1 KB Created: 2021-09-10 11:21:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a83f9b50dd9140e87237131bc5b3a6e2 SHA-1: 3edda1a0170ba295dcf7278e70d5a654b43822e9 SHA-256: 817b5a9da7c562fbe5403f8c2905b07448491789abf1cddad077ef4119194ddf
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to other PDF files hosted on various domains, some of which appear to be compromised WordPress uploads. The heuristic PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM indicate a pattern of distributing links to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/uplcv?utm_term=farmville+escape+mod+apk PDF link annotation
    • https://limsurempat.com/contents/files/dipurolugufedijel.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/murafudi.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e3a85d7ab---25072479119.pdfIn PDF document text
    • http://debnine.net/UserFiles/File/sorunoj.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/zuzuk.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/vesigizeta.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/69476543037.pdfIn PDF document text
    • https://senegal4d.com/contents/files/rupupene.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/o72ejike05s5snltej1jtj7ph2/pavurabemosomama.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/zofam.pdfIn PDF document text
    • https://ibextrail.com/editor-images/53342343006.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/xupuvu.pdfIn PDF document text
    • http://www.klimavill.com/data/editorfile/59516066374.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/woteponupok.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/pudofimubosu.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/nizototaxuvenofotufofile.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/siresazalusamuwilo.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b4f915060---93239355062.pdfIn PDF document text
    • https://dukupahit.com/contents/files/davivos.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/bewiradigalesakirukodigi.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/rowulerutewid.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/a8c692b4835c588e80de004983ceabc2/matilowej.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b8e82eabe---solib.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/bimasejuwojalu.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/87450804659.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/13080498747.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_off0000e7a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB4 17768 bytes
SHA-256: 6e57d6b4a0e937e0d0259e8f4f1b815be36594c3ede0326d859a7bc8d5a28b1c
font_02_sfnt_off00012e2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E2E 10608 bytes
SHA-256: 3154923a26bb5277ae47cea4b8dc4a84fd8463865da946755d2658b1bb534a62

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