Malicious PDF — malware analysis report

Static analysis result for SHA-256 5de164c5d2629d51…

MALICIOUS

PDF

82.7 KB Created: 2021-09-14 02:25:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cf3eed55552f2c60e727bb845c587e8a SHA-1: 64630b4b1968a39b58c9e65e438b68e91ab7ef62 SHA-256: 5de164c5d2629d51af762f67c31301441e7fc9a58c0729d749439dbc28c7d182
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it likely serves as a phishing or malware distribution lure. The document contains numerous external URIs and link farm patterns, suggesting it directs users to compromised websites or potentially malicious content. The presence of multiple distinct hosts and disposable hosting patterns further supports its role in a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://synerhu.ru/uplcv?utm_term=best+instagram+hashtag+app+android PDF link annotation
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/65780098233.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6d4aded2e---78614571739.pdfIn PDF document text
    • http://urbanelect.com/userfiles/file/86730502579.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/8c4964075762eae91271088a20d7133a/lekafamokijabufuz.pdfIn PDF document text
    • http://ryanoomen.nl/uploadimages/files/64374320141.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/3d2a3032841e9a719143de74c59e8407/veworazevuvepejip.pdfIn PDF document text
    • https://phongkhamtamthan.net/uploadeditor/files/maparupazizapenawukewag.pdfIn PDF document text
    • http://ardennes.proximeo.com/ckfinder/userfiles/files/47817719321.pdfIn PDF document text
    • https://igraonica.me/userfiles/file/32061046009.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/af2pr8ln4qqv5malajp5d44nkt/49304955943.pdfIn PDF document text
    • https://unitjaya.com/contents/files/pukozanelipixalilovigeso.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/tiden.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/nonabosibarorefajuxabu.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdaf809a77---nesufozofidovin.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/2964383706.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/33758688591.pdfIn PDF document text
    • https://mallorcaboom.com/res/wysiwyg/file/devokaxalopumekerako.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/dozopoziritigig.pdfIn PDF document text
    • http://barefoot.pl/userfiles/file/854003765.pdfIn PDF document text
    • https://rugsdirect4u.com/uploadedfiles/file/gulewugorodek.pdfIn PDF document text
    • http://snabsz.ru/ckfinder/userfiles/files/vudevuninowusibidod.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/33895142698.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd97b0e51d---zujupapoki.pdfIn PDF document text
    • https://bela.geekers.tw/upload/file_folder/file/tedasovazagezufisi.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f259d759ae---1232884227.pdfIn PDF document text
    • 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_off0000e008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE008 10848 bytes
SHA-256: a25fb7fe9cd891076e2d0e730fc24ebd31872dcdb17f27b0eedabf6725ea29cf
font_01_sfnt_off0000f8ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AE 17140 bytes
SHA-256: 0920a449e375e2c46fe6314cc82769de608f37422e0bb865a8b5327c98caf5bc
font_02_sfnt_off00012504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12504 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1