Malicious PDF — malware analysis report

Static analysis result for SHA-256 672c1ccb320b43ad…

MALICIOUS

PDF

79.9 KB Created: 2021-09-06 04:27:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 652cef5a744321e89ba081843b8bfba5 SHA-1: cde748ee83316c225af2f8ecef92fa6491fd5c54 SHA-256: 672c1ccb320b43adbedb9b4b9e186a70acd1aa6b7299a24081a34557173efc44
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. The presence of a URL with a 'utm_term' parameter further supports the idea of a targeted lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://infrive.ru/uplcv?utm_term=water+treatment+plant+report+pdf PDF link annotation
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160787d9b0ba50---gupopivarevanatumodebewe.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d90fe994fca---ketulenesugo.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/zilaluwabegotepolinamazi.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f4ce9e84c---65238115406.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/9d10d2676cedff9554e2f7f7d5215958/55600006575.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb3e9b74ca---9034278855.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/kifozojavobegel.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/jaguwixa.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b63c0a6c647---43644238692.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/44781489218.pdfIn PDF document text
    • http://hamdard.com/hamdard/app/webroot/img/ckfinder/userfiles/files/37863788357.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/b6f8ed39901847d0baeb925b0c09a5ee/51065332754.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/guvamizeletopepifefumajaz.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608418563b395---xifumudujaridifusapas.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/15f730a8ccb2f9e83441bfd284be970a/97820133481.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607311b718872---kovogatuxixuvamije.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/7224907348.pdfIn PDF document text
    • http://sdds.be/userfiles/file/59004267774.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/282966868.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/18147870641.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/mokikir.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/vs5bb7v150tttd4bfg2vnaq0f7/39145405652.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/tidiwatorirej.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/belov.pdfIn PDF document text
    • https://udruga-invalida.hr/files/xefaseveda.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/tusamokufivipijip.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_off0000d47d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD47D 10392 bytes
SHA-256: 529b8d076e1ed22801288a888fb40633070edc6bfd815fa641108d4c494462e0
font_01_sfnt_off0000ebf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF2 17636 bytes
SHA-256: 068f6bf1ece04f13a5d9dd24f683cd90de5843b7583081a09dbc61dfcf477bb4
font_02_sfnt_off0001197c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1197C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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