Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c1572936cf88343…

MALICIOUS

PDF

77.7 KB Created: 2021-09-07 21:07:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b3a93d7d86e52bb86da0fd4dd5d1d6ca SHA-1: fbaac441c40c88bce15d753a9d430220d047d3dd SHA-256: 1c1572936cf88343f4093c662e38e7bfec8eee32d5259e1ee900b0c119252f9f
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It functions as a link farm, containing numerous URLs pointing to external resources, some of which are hosted on compromised or disposable domains. The primary purpose appears to be directing users to potentially harmful content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 https://renesens21.com/ressources/upload/files/vebafugirasosixod.pdf In PDF document text
    • http://architects-desk.com/uploadsfile/56410517704.pdfIn PDF document text
    • http://fruitsad.pl/images/file/99945474231.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16075806a1265c---92995471225.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b10d53e7baf---nobuwil.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/65309529483.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/lufarunugol.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1c0177ea8---zebotesoxuxojuk.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/cufprk5hudbh3oc8r2k52bmh1u/zebodu.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ea8dec137---34323243279.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/e950a96e89fd2c0fb9b3511581a281a4/reresisurobazelap.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8aa8775166---74485957904.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/50884171337.pdfIn PDF document text
    • http://eis-pieschel.de/UserFiles/File/fifum.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/72347681931.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/f4ce7b3fe3590cebdea54fc210f25470/81938866011.pdfIn PDF document text
    • https://webornate.com/viking1/uploads/files/20119948593.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/25613707775.pdfIn PDF document text
    • http://rlangkhan.com/upload/userfiles/files/batipinibix.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160731eca19177---gudar.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/vapawererufatiduranomix.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/riduvonadiluwevuzesa.pdfIn PDF document text
    • http://pcwest1980.com/clients/9/9b/9b13e9c1eb96aaf026ead536bb80a376/File/33976043653.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e85555ae155---74959432692.pdfIn PDF document text
    • http://home-delighted.com/user_img/files/wudeduk.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16076c38d122a3---8298410581.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4bf0d5abde---43010404941.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=complete+food+and+nutrition+guide+roberta+larson+duyff+pdfPDF 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_off0000cdbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDBD 16004 bytes
SHA-256: 5fc2fdd3592416187478dbaec844a04b07be09ee63a7308f3da511daf968dd00
font_01_sfnt_off0000f691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF691 11228 bytes
SHA-256: eff4e8b487187ec470f78fb3e58823e0378e6b7803f4d43be17869e2fbf845f9
font_02_sfnt_off00011074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11074 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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