Malicious PDF — malware analysis report

Static analysis result for SHA-256 b374d1c578b2669f…

MALICIOUS

PDF

92.0 KB Created: 2021-06-29 16:43:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 5fc307d1b9c2d7720ad79be5727ba981 SHA-1: 9c6d6708320b5eb442b53f7a42492a805b1a2819 SHA-256: b374d1c578b2669fba762104ef7d8c44ce93da6be35e6ad81498a4526c37cea2
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and other disposable hosting sites. The primary purpose appears to be directing users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://kalitelivideoizle.com/resimler/files/noxabowiteromasaxin.pdf In PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/5dc5082da7273e81a299029c434220d3/xozekovulezes.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/45261537884.pdfIn PDF document text
    • https://altbuket.ru/files/makipakepojorida.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943c583893c---61489971391.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/dd28d834dfdabe0bdfb6df9f4ce486aa/1127368649.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/9caee6e3f52a922f5b642bc12ae1a4cf/teluzekokugusopijatumodi.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/9476132281.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a29d991d8---titukumojikagogukulow.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/69004764918.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/qjdn1qnldmhcgsfr3h7f5oo8pm/63507079437.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/pu8q0sf19ms3kaododiejr3re0/39114152964.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/3698859579.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160841d747d37a---64336479374.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16079c7fcaf28c---85625278662.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853633c1c02---53057579528.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8843387ddb---66676731836.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/cl5pfn70s4bfi2d7fo9ukempei/289815432.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607cfefe2a04c---jowafuweled.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607add2c547b2---43661163095.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/ohhpkp2t3k4qk6lg3n8hkoigkb/zupobaganatuw.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/10024017359.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/884c094fb69bf5bc83599dddd5de2a43/bipaxaxajitenalafevafe.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/68bb26fc86e7fa544ecad3c5c658aa17/kigupobobaroburofuvu.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079cf26cd43f---webawudifativ.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a105bd5f96d---vejenarabevagaleme.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/cb739750282d2cf949dfea17e83c2749/sedetob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=funny+quotes+on+maths+subjectPDF 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_off00010492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10492 17372 bytes
SHA-256: cf2f14344f2f8ab56cb0afa252a5db55c69a51f93d7a7e4c013bf8fc669d6329
font_01_sfnt_off0001317f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1317F 10864 bytes
SHA-256: 7400e68345d088c9d731dc9fee181d09f82e398cf47e6e60b5510d18f2a61a23
font_02_sfnt_off00014a84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1