Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ce7f396fc370ea7…

MALICIOUS

PDF

76.0 KB Created: 2021-09-12 17:19:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8b16900244673e906d67c9b0664e358d SHA-1: 0ac9a9f7650f7d7a75bf4d4146a5a38d3415320d SHA-256: 5ce7f396fc370ea778fb2295a3100ea4072f6a53e18929877cb5c5da39d87fef
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to various domains, several of which are hosted on compromised CMS upload directories. This suggests an attempt to lure users to external sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/5fpv7fhqel4k5kin7mordhq143/36322775556.pdf In PDF document text
    • http://rideabikenews.com/user_img/files/pagasasetexivej.pdfIn PDF document text
    • http://cdio.vn/uploads/userfiles/file/wepisowu.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/8448396259.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/zosawumijamezukebuxibi.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/sapumizifaloz.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/bokokotavopapukesofi.pdfIn PDF document text
    • http://ed-union05.ru/files/file/pomenadejawatuli.pdfIn PDF document text
    • http://joeun-it.com/userData/board/file/sojolibonipatefofube.pdfIn PDF document text
    • https://kaparatt.com/images/File/92170281505.pdfIn PDF document text
    • https://aynispirit.nl/userfiles/file/23117567181.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/052a586e8c65abae963b2603d5a7bf0a/lubowubuwud.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/tagugevipuwij.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/1967400735.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/5a0f22ffb4d7d565332805a3550dcb45/15760948371.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/2810469844.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/govef.pdfIn PDF document text
    • http://fastcredit.ge/userfiles/file/25919796672.pdfIn PDF document text
    • http://ketphatthinh.vn/upload/files/2091927206.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/69537332215.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/gomomovotitofadakaxiz.pdfIn PDF document text
    • http://hichipper.com/hichipper/uploadfile/file/2021090101015873499.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/vapalawujoxaku.pdfIn PDF document text
    • http://dlugopis.kbo.pl/ckfinder/userfiles/files/31570754328.pdfIn PDF document text
    • https://soenen-pneus.com/upload/file/41482476292.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/paxarixoratijum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=5+letter+words+starting+with+koPDF 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_off0000c255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC255 10740 bytes
SHA-256: 2236476d55535b55497e60753802e823bb67c66bd86dcc784b7dbc232f6a5dfd
font_01_sfnt_off0000dacc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DE 18516 bytes
SHA-256: a29ca09928c590ba35591ca82b3b0979c04148fea711866a09ad0840d2f9f775