Malicious PDF — malware analysis report

Static analysis result for SHA-256 bff1018b293479b9…

MALICIOUS

PDF

72.8 KB Created: 2021-09-04 17:22:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e425d73295f144eb8ea591a9b581e3b3 SHA-1: bf0186f004aa46bc3475184bc43ff107b4546ef0 SHA-256: bff1018b293479b9b153880b877e9bbc6589cd3a4b780b2046942977301d3e9a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links pointing to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate the document is intended to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=manual+hec+ras+5+espa%C3%B1ol PDF link annotation
    • http://villa-carlshorst.de/sites/default/files/file/55685697690.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126859cb77c8---dinodeda.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c628ed32b13---59500972670.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608e09f16ef65---wiwavovajiduj.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/78236952427.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/9a9dd57ffcefca054af9dd04892d8472/runemamulawano.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/zepefukaku.pdfIn PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vogedokomopugezada.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/rozujokerozuve.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/26ee590961b0d0b572dcdd9a4a45d0df/6803157796.pdfIn PDF document text
    • http://0965818789.com/CKEdit/upload/files/zuxaviko.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/jesosabatazewareli.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b0da34d27---82397958226.pdfIn PDF document text
    • https://mattress-leader.com/media/zenodiwezidemojixilewor.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/93a48b9d664c5e9bcfa07f217e43b031/88359480991.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/slop36mjdnlr4btvkvckabtjfe/mulewetalevefisukuga.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/67232539185.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8d972a254---legebolodiwaludemukegax.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/befasugarorezaberiwera.pdfIn PDF document text
    • https://activepymes.com/pub/file/kejoteniti.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3775e60c8---vuzovemom.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160b073a14aba2---99362042289.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_off0000b7f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7F9 10716 bytes
SHA-256: 7b5f47af88b36c609952d8d353c178dd1275570d6a5d4a88cd85ce4180a1d1f1
font_01_sfnt_off0000d04d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD04D 16992 bytes
SHA-256: d1d8cccd29629ff1b7f735a129d5f29238ad04ffe83f6c71be55181f21819cf8
font_02_sfnt_off0000fc3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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