Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cbad7be719a6ba6…

MALICIOUS

PDF

72.7 KB Created: 2021-06-28 05:47:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1b6ca6d59ddf0869ad2875cee3e69fd9 SHA-1: 23275bb3ed76136abf0217f09de889495fc4a84f SHA-256: 4cbad7be719a6ba63d1dfed5f20f75022fe2d6292137b7ca1b91189cd604ba89
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm on compromised WordPress sites. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to lure users to potentially malicious or phishing content. The presence of multiple links to compromised CMS upload directories points towards a distribution mechanism for further payloads or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a950bc2cb8---newixonewata.pdf In PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16084dac0ae5b5---bupopudajidovu.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce02443bffa---parabomuvuganeda.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606f59c716752---fosibiwakezi.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/80670755296.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/9smqgrp7fpo96hhk99q5il9t4c/rugonuf.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca31f9003c---26831341997.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/73611976709.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/batuxopif.pdfIn PDF document text
    • http://18554080.com/userfiles/file/31117559254.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608139f4ee4c7---59202315411.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/23973487938.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1bf589c7a---58399322492.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/da2e0ecb532420df9c4d0e63acd3f113/12730923914.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/potanirowosipo.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/88b362e99438d2fa904230ef93e75a1a/79938484470.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/pabujigokofuwazetokunujox.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/bopuwozelem.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/4g3uspet54tadref5b57slg648/83263442046.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-6-23/20210623090514414220.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/201620348973.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=the+story+of+civilization+class+9+old+ncertPDF 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_off0000b8a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8A6 16100 bytes
SHA-256: c41b38800112628a6e59ff18c94a26db3cfa397abd0461b5935505a7dea1c874
font_01_sfnt_off0000e261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE261 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA78 10944 bytes
SHA-256: d2cb989dfc63424f510160c8ee2f34396a7422515d60775db8b3934bbeabfc1d

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