Malicious PDF — malware analysis report

Static analysis result for SHA-256 0361c7842a12ad3a…

MALICIOUS

PDF

84.5 KB Created: 2021-08-28 20:48:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c185bbbd3d502b7fb1020ac8f826fcf6 SHA-1: 73c216ff0fe60354460f623649f26725e9181687 SHA-256: 0361c7842a12ad3ad2337b32058f6c875c84a9c5d6ed14797c1a36a6320b46a1
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised CMS platforms. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to lure users through search engine optimization or phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://nemalipics.com/72945771560.pdf In PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d357c9d16b9---judisezawadagejagidizago.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c7c11c6ff23---53346929504.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/26099236799.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/gazekogunikapuwodusojupu.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/0j0o7b84qolhnruo9hnbvfste2/tifalavifuzosulemawed.pdfIn PDF document text
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/84014180459.pdfIn PDF document text
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/mokaxadofubezorapejemetes.pdfIn PDF document text
    • http://fairmonteast1975.com/clients/0/01/014dde3c838f86fef2ac1d31a86c415b/File/73214883971.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/cn2gjugtggv3s6gc4dtgrrab7p/68527083802.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/bf987db458fc07f69e85ea12b9db8c15/tefisabekoxa.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/da3c0f8609c48390eacba31e457bea91/88735701260.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/3266810852.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/c62d5be803dc99e6304bbf9a5e64b8f8.pdfIn PDF document text
    • http://licausi.it/userfiles/files/10416012539.pdfIn PDF document text
    • http://changju-hotel.com/CKEdit/upload/files/85560283476.pdfIn PDF document text
    • https://medpressa.ru/files/file/vumemozufabavifowako.pdfIn PDF document text
    • http://ty-int.com/files/files/37355902217.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/67505888374.pdfIn PDF document text
    • https://thietbidiensino.vn/media/ftp/file/denegejepevomenefodikaw.pdfIn PDF document text
    • http://jngf.cn/files/file/fazefu.pdfIn PDF document text
    • http://inezorviskids.com/clients/37546/File/14108169385.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d5e2068858a---15071177118.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=warframe+how+to+sell+for+platinumPDF 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_off0000e4c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C5 10804 bytes
SHA-256: 9439141ea673e02285910b75354ea9135e92629a3e9e114640c4a0603d4b6fd7
font_01_sfnt_off0000fd83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11595 16884 bytes
SHA-256: 7775d988ca9a2c490267f678ebfa8fcd62c26099db9452c5417734fdbed3d3c6