Malicious PDF — malware analysis report

Static analysis result for SHA-256 279877ef1ea3d24b…

MALICIOUS

PDF

73.0 KB Created: 2021-09-14 23:31:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b9455be56d4f99b9dc570f8d54a9b571 SHA-1: 42d9042be9581df2b4371662edc0d885e5c403aa SHA-256: 279877ef1ea3d24bfbfea6cc56f62f6d6afd9e200faa76af87ca1c0a19a4721f
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many of which appear to be hosted on compromised or disposable domains, suggesting a phishing or malware distribution campaign. The presence of a 'link farm' heuristic further supports the attack pattern of directing users to potentially malicious external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://infrive.ru/uplcv?utm_term=pharmacy+practice+and+the+law+9th+edition+pdf+free PDF link annotation
    • https://rjpexport.com/files/ravawodekupug.pdfIn PDF document text
    • http://lerucherdesanges.fr/userfiles/file/gojipirizedovolaz.pdfIn PDF document text
    • http://anpo.vn/upload/files/23058652902.pdfIn PDF document text
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/wadusudosaxinolasipelalin.pdfIn PDF document text
    • http://maychebiengoduykhuong.com/media/ftp/file/nojexirat.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/logesujozixit.pdfIn PDF document text
    • http://bushurov.ru/images/files/87307162694.pdfIn PDF document text
    • https://777mto.info/contents/files/xufofugefuruzilegusip.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b73e413969---22123573032.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133ddb092e36---77188469897.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/2ifoi1h94tc3bbvmd7c0a0jsq5/zamitotejolasevup.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/rebalo.pdfIn PDF document text
    • http://www.polni.si/Images/files/63330037341.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/xowitade.pdfIn PDF document text
    • https://www.utn.ac.cr/sites/default/files/files/12697569865.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16138fd72b30ed---vugotogizunularererame.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/83481535946.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/zakinopujaburixu.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/sekavovatixazumefefow.pdfIn PDF document text
    • http://na3.it/misc/file/21324995168.pdfIn PDF document text
    • http://photou.cc/ckfinder/userfiles/files/kumitorulasifikogaxo.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/144f9125a2783daad6290668cb8cff12/63640255115.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/zuxidukewunexagotogibef.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/bilijurezodogok.pdfIn PDF document text
    • https://grafconsulting.pl/Upload/file/83800092374.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_off0000bb2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB2F 15888 bytes
SHA-256: b15fd125fae3dbc721641e91bedaba1f92345f0ad90c697aa01f51efd54787b1
font_01_sfnt_off0000e3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fbfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFC 11088 bytes
SHA-256: e364bf926d78c10e7fbc493fefce41ef9539fc7a14307f6628c5c7882cb55f19

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