Malicious PDF — malware analysis report

Static analysis result for SHA-256 238380396f9e64e8…

MALICIOUS

PDF

146.6 KB Created: 2021-05-12 02:28:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 6e3b86abdc639e2598092f475f36aca8 SHA-1: 95495dccdb04af79052496a838ff73ed7db3cbf4 SHA-256: 238380396f9e64e892811e9dce13be214fe7e8674d9b48974ae674e38a63d8b5
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites, suggesting a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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 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://infrive.ru/uplcv?utm_term=keithley+2010+multimeter+datasheet PDF link annotation
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/cd8db6b465742f4495afdddc850b3ffc/xemafowidodugojavuxatib.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a7fd695c7---vamozataxamiposunalabetej.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16093c2376f1c7---vodowanabiwetitejo.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/e72798ec2337b6633af63b541a249504/45549638447.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e13b1953dc---lezobanixigoteter.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/bcf37d5928b1e2988aa33468e7adf2a4/larafofodu.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/57907031039.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/mpl7sl3o7mmq6nl65t97p54duh/51446052527.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/arpt9opj83rajhd41kfj6nvtfg/raxudosowan.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/ddcb066c08c669f3f1a7f0c1d58481a2/73622761510.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/7f115b5d24ece2b424a6ddf8cd0fdf77/78028360390.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083202ae0e7e---wukuponiletepupuvabugav.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098bab5c480d---38089737630.pdfIn PDF document text
    • https://vate-tire.ru/wp-content/plugins/super-forms/uploads/php/files/d167fa597a2844a2aa026fec736cfb88/5309408409.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/12546437163.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609afc8f9b733---mojupurogedabasif.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/16074af80132f7---39649981681.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001dc7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DC7E 5460 bytes
SHA-256: 73a52f00ca52d9a86acbeac0ec36195761c28488587ad79b8db5e447ae2498e0
font_01_sfnt_off0001eeef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EEEF 2160 bytes
SHA-256: 4859a2772468ce84bcf2682ff73e1d97769bd5faca333284f2709e874f7f625e
font_02_sfnt_off0001f843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F843 13460 bytes
SHA-256: 24758a90c0e434b86cb92b0408687d1b8e74ac1bd3aaa626d3e804ced8f7e7c1
font_03_sfnt_off000225d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x225D3 16084 bytes
SHA-256: a56dd6e3cfa148c92ed5f3142193374b407f6958f728d0c91ff19ef246bd70d4

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