Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e27170cf32e8057…

MALICIOUS

PDF

73.1 KB Created: 2021-09-18 16:54:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 793c4099d003c9e9cbef58605fefc416 SHA-1: 92048c0ecee42a0a204f923b8cd05c7a6dedd7fd SHA-256: 3e27170cf32e80577a14663bcbf1482f186bad7715330efa7543e35dc30f9aa8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. ClamAV detection and ML classification strongly suggest malicious intent, likely phishing or malware distribution. The file's structure and URL patterns are consistent with a malicious document used for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://thoitranglani.com/upload/files/tabifarawa.pdf In PDF document text
    • http://e-district.org/userfiles/file/22212575956.pdfIn PDF document text
    • http://linhkienhunganh.vn/luutru/files/25687726865.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/37320696211.pdfIn PDF document text
    • http://hzqljsj.com/images/upload/File/78959101677.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202109140810568904.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/jovuzusidavino.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/gozosibaxuvesajatifalijaj.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/36925520857.pdfIn PDF document text
    • http://www.sanjuktabanerjee.com/fckimages/file/jizebetasezujitexadovojud.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/xadiguxojag.pdfIn PDF document text
    • http://vers-ma.de/userfiles/file/86718741822.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/19575459583.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/e9184a78a6da0a1e93c96024fde989ff/boxasemopajuvonovaguzogu.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/91344038032.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/1971805275.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/79624271546.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/294f36f8afb0b3945c3d197354f8254f/31342190193.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/273a38a897c6bb017b35f422e390d682/dutovapimetelinukubuto.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/kegeripam.pdfIn PDF document text
    • http://demirlermetal.com/resimler/files/52365375314.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/lilodu.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog/file/bowavitefuzolos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=creative+visualization+shakti+gawain+pdf+free+downloadPDF link annotation
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/resara.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_off0000b93e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB93E 16736 bytes
SHA-256: 989077502082fe18bfdf49c827cc843ab13e06142c1e20272e53246c114a245b
font_01_sfnt_off0000e44d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC64 11212 bytes
SHA-256: af82a854322a4dace32644804a2f2c9a4d19c93ffcea99e370f8107b90729429