Malicious PDF — malware analysis report

Static analysis result for SHA-256 c687d832adf9ae10…

MALICIOUS

PDF

87.3 KB Created: 2021-09-06 13:22:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f0f2cf1702560b85cbbdd2f841603395 SHA-1: 92186a76c9b80e64376e24a378b5865ec9c7f854 SHA-256: c687d832adf9ae104e3cf4dc8e6232e6d4304b80efc77c3dc0090b0bdbd983ea
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to various compromised WordPress sites and disposable hosting domains, likely to download further malware. The presence of a 'download button' lure reinforces the phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a15a221469c---49866556554.pdf In PDF document text
    • https://bandotrading.com/uploads/file/jizusoketikejo.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8a504637e---74471852756.pdfIn PDF document text
    • https://longhoang.vn/upload/files/jonurokada.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6c9b50b6a---8417114191.pdfIn PDF document text
    • http://softtox.pl/new/userfiles/file/xekikisidusofuvarud.pdfIn PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/dafomuguzibozavogubopir.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cf5f4ed017c---56859925104.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///tigekepateguw.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c390d186dd6---tutokogidojineresurani.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6496a861c---sogij.pdfIn PDF document text
    • http://zenithmetals.com/files/laboligimadirexititinoti.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/bibonimomeweverazalupo.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/15377851481.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/s02r3eon2qf3vqnh8cjkfge0dm/95768144220.pdfIn PDF document text
    • https://uudanbury.life/files/file/pegotu.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1626423315.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160861e5903564---39775829085.pdfIn PDF document text
    • http://nenorm.com/files/files/fidevexo.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/4abc634fbba6a20bb50dbf170a8c1ccc/57609813484.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/58bfa6548174578e33c73d7419880dff/guzaxuxek.pdfIn PDF document text
    • http://mextro.de/upload/files/79985679158.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/75967205435.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=pdf+editor+full+version+for+androidPDF 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_off0000f14d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001095f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095F 17532 bytes
SHA-256: 536666dcfdfaf230cfd1f8b0d5c824053a739b8b67d3e9bda9a64ce6bf75e047
font_02_sfnt_off00013707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13707 10516 bytes
SHA-256: edbc6fb3640dfb17c8094d878b754631b463e6d0ad4cc395e3b31beeebd9e3fb

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