Malicious PDF — malware analysis report

Static analysis result for SHA-256 27f55b50ab3caabc…

MALICIOUS

PDF

73.5 KB Created: 2021-09-01 17:23:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: dd684552c0ca0afab6e859bcda12d60f SHA-1: ec9e3a5903656574787c65edab3982768af3f9e7 SHA-256: 27f55b50ab3caabcb2b0e7741325de57a19444604f5d8a3d48a7431f4fb19242
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier. It contains numerous URLs, many of which point to compromised WordPress sites acting as link farms. These links are likely intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a358f2311---78359605505.pdf In PDF document text
    • http://irinaburmistrova.ru/files/burudajonubera.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/85247406260.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160957f7dbe578---dijetabedivemizuvotovaj.pdfIn PDF document text
    • https://go2germany.ru/files/file/tusekenununa.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/nf3dfhnvc3qcjmptb2om5mdku2/46449576419.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbb3b66287---78025316974.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/nukosabim.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160fcb16722c27---19697635573.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/vipuzifise.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/gepegoniladanemud.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/04bf99188ea6ecc224d397c817817e06/52380706487.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/42374221261.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073fe9aee857---27735913781.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160dfc2e699a83---9667698408.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/27612161072.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b9463d68dc0---pewivebovozazokazozijaj.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/86977313263.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/96402098596.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/37833298634.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072f6a8ccbf4---sadew.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c796c57f8---gokeluboroxoxebexuw.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/kezelujuma.pdfIn PDF document text
    • http://npas.ru/pic/file/kiramowimajekixajir.pdfIn PDF document text
    • http://tsraccountants.nl/mailing/images/photo/file/31580000096.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=baby+grunting+trying+to+poopPDF 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_off0000bf7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF7A 15884 bytes
SHA-256: dbd08a3d94354e1f135a8b9ab5cbaa2aaaa7ecf4e90d2ab45e48484d7338d96a
font_01_sfnt_off0000e77e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF95 10488 bytes
SHA-256: a9bb23b423ae14153ea91f4a39c9103802138fb2f0bda0d35a8a257d66257a9e