Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2b747cf88a8d825…

MALICIOUS

PDF

88.9 KB Created: 2021-08-14 01:11:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b23d3013e5b7c02db7b316ddd887fe8f SHA-1: 5be7291e64f42f98cf5e728c6794570028154e8d SHA-256: b2b747cf88a8d825fe4d05cf7e145c005cbf8c5b641f87ce5039a63db19257b4
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a link farm. It contains numerous URLs pointing to various domains, some of which are hosted on compromised CMS upload storage or appear to be disposable. The primary function seems to be directing users to external sites, potentially for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://xn--365-pn7mwb654m2qn.com/ckupload/files/4779255413.pdf In PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210713154300.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/c0bccb756efb3a2363f155a14a73c3a4/72390106579.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/ruligor.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105c4149ab6f---rufetalafokapek.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/ae0c0a2ea049839272a488855f1722f0/wadeka.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/disado.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160b782f1d64fa---54335327521.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/94346926892.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/49410520408.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/57131284381.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/99837369972.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1607efa6b285f4---tipuxijosu.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/47236142909.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607484a54de67---xexuzudozowudapa.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/3b9795bbb064c8b473e741a5020f788f/nedokulidevuferar.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/wagewi.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608e21c4f0c64---gexepugofa.pdfIn PDF document text
    • http://moristas.com/userfiles/files/jukatololixo.pdfIn PDF document text
    • https://hijaustabilo.com/contents/files/dijam.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/3f0c3ef02df24924600d22cd59086ec0/pikepapomobeliwelede.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/26121130567.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072bf4e48a8b---xerirukewifu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=pokemon+tower+defense+unblocked+games+66PDF 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_off0000f230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF230 18728 bytes
SHA-256: ec8b22c00c6bd66c8ec13a6f2457978677b30c6c99f8fe7428068d360447ae23
font_01_sfnt_off000122c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AD7 11312 bytes
SHA-256: 0d874ff3f041cdbb59efc16c8e67d6359490a2127c219bc3c476880c71896e8a