Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c853c56da844651…

MALICIOUS

PDF

90.1 KB Created: 2021-09-01 12:04:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c2b294d06461de2648c70020d5489693 SHA-1: 285422a11e5381b881c85dcb177ef119be088a98 SHA-256: 1c853c56da8446513fa1a45941f2bd2b310292db0151c23d6a30a9f1eca1f9a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, with multiple URLs pointing to compromised WordPress sites. While no scripts were explicitly extracted, the nature of the URLs suggests a phishing or redirection attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1611e17089e121---gixile.pdf In PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/pefokirigabanuwexeva.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609422d8208e8---mifozunajufidolosinusoluw.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088618a818b7---71858672624.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210819193213714455188.pdfIn PDF document text
    • http://tcurryproperties.com/konadnew/userfiles/file/rumid.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/vinetaxitoxabagoputumopag.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/50239826662.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/jiromekajorovatalik.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/43540589216.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/7ca7bdcf8ed3554eaa1005d257b2a382/36423740316.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/97106205955.pdfIn PDF document text
    • https://topjobsnepal.com/ckfinder/userfiles/files/narisoluzufumi.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16105a996426dd---wexavaxesaturaduvibokitim.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/48232730040.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/dowoniwe.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/v973uv2achgn3urpefrnl10och/19890177680.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607109479106b---77735261928.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca7ba2ebfd---xuzalur.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/5312135d6b4c3603d1aa7c2874db2d0f/46787997339.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/6a249e8978ec32c62f80a6c7d1a4dd5f/75521282695.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16115ddb5a0f72---33808654058.pdfIn PDF document text
    • https://aquatim.ro/uploads/files/majuwikod.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102e24d2bae5---78278125133.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=tale+of+the+nine+tailed+ep14PDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE90 2180 bytes
SHA-256: bffaafa03f4832176533e8d9d575c04b31d6f9f8511b928cf7b77fc4048e5abf
font_01_sfnt_off0000d858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD858 16104 bytes
SHA-256: 4204f4a647e3e8488fc3125e36d68471fcc515b787f7ef36a685bb1e406e82a7
font_02_sfnt_off0000ed9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9F 23240 bytes
SHA-256: 7d9e41443f39bbdabc4bb9c978ff38fbdfd2a109c1616e1d7b300cdbc964ea9a
font_03_sfnt_off0001277d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1277D 10420 bytes
SHA-256: 1014cda4352159304741270c3e7f975eb0757dbc5a838083b0b8a34f40d71609
font_04_sfnt_off00013f14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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