Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3f023736c69e1ef…

MALICIOUS

PDF

82.2 KB Created: 2021-09-07 08:51:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4e37cfd1ce4f76a9ae3f1cf7ca60c8f1 SHA-1: 3aac6bf7cb7877319f20d0d54c0f6af807dcaa98 SHA-256: f3f023736c69e1effe9d86df8f7cda65da52b5d7ec0a11307139974f095c3f71
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to various websites, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. The presence of external URIs and the overall structure suggest an attempt to lure users to external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d53cccb428---dugonarafeji.pdf In PDF document text
    • http://blackivy.pl/userfiles/file/35894271694.pdfIn PDF document text
    • https://rrrc.us/userfiles/file/zanajebofedi.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bff4555c049---lifivefuzugafijefixekiwu.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/sotepiligejukibu.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/dexuvitesisedumigo.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/giroxu.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/29805199400.pdfIn PDF document text
    • https://hunglivet.com/uploads/files/202108162330082702.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/5e49506b4bd9fb427aa05c3f294601eb/95441395562.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/33452169625.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/26fde3d00c476fb9b74930505e03672b/80198179079.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/79686040049.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/d7septbt3gvbligjfj8k80ti88/25524170022.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/43121318927ddd9cd26e1da5d11a68e8/23049851655.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/0e7a3a3d208f6a23852f7f5699f4a279/82399097324.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc3e01f1f5---fibixopofapize.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/78242574116.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/98622537069.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/66949530851.pdfIn PDF document text
    • https://digicpictures.com/downloads/44410578452.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee7ae5652b9---68752021206.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/13520154807.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=preschool+reading+worksheets+freePDF 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_off0000dcf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f50e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50E 10932 bytes
SHA-256: 0f1a32a290fcaaba75dd2c9c421601a9886ae9db8ad22bccc28bd64e225bf901
font_02_sfnt_off00010e32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E32 17884 bytes
SHA-256: b1e6c06cdffeabf254780dab4a5975de2a6b281e903505c68029fe6957b122a8

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