Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5eb533947873435…

MALICIOUS

PDF

85.6 KB Created: 2021-07-26 01:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 235422d8a84eb2e3b5e68c268787b889 SHA-1: 4822111ce11d926832f987547329fc0e7828bcb0 SHA-256: a5eb533947873435dd76ace9567beeee2b09b9542670638c5c459bafd2492342
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress upload directories, indicating it's designed to host or redirect to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure itself is the attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ddf5adb276---zugajizuguveki.pdf
    • http://techhssilverbuffs.com/clients/61416/File/74070274831.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1eebe8638---likibawurisupez.pdf
    • http://jogforbigt.com/clients/6/61/61f7a61d17da296148a50ccd59c4a139/File/89019362472.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092fa35896b2---29432102412.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ca08a2a9a---88559631367.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160a59692125be---24838711541.pdf
    • http://wellnesszeewolde.nl/site/data/ws/files/50838968041.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d4c098af50d---49853650952.pdf
    • http://a-swiss.com/upload/userfiles/file/85007508947.pdf
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/sjl1icqn5g1tmojpvk6knsvh86/14973401144.pdf
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/5ea840d976d75f5223493154a68ea1d6/sebesizevumuxuduni.pdf
    • http://fecoil.com/userfiles/file/94539230554.pdf
    • http://nexxosrealty.com/userfiles/files/lobutemimapelinalux.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160b32de312dd4---58684215175.pdf
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/fs6he2k8jen4eq9pgqte549afv/20632202505.pdf
    • http://caratow.eu/userfiles/file/binozaxegobima.pdf
    • http://www.toptehnik.si/images/sakixipewodozan.pdf
    • https://almoheetmanpower.com/public_html/userfiles/file/94614134736.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/o2ivbs31erqobu0o11pmnau7oa/nimuwunajoki.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b22951b278b---9712706578.pdf
    • http://www.deco-interieure.com/userfiles/file/kimigizejosejuxikuxep.pdf
    • http://abnicum.ru/files/file/fijulugoju.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/7571fc706e5726163249f09b5f6a29d6/falopokakuzewiwil.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+do+a+balance+sheet+for+a+small+business
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea8b.bin
6f46475ad7a17dc4c23e9bdc9c513e8db29f39a2d3b7ee6f49ee7ff0174a8fcd
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8B 16772 bytes
font_01_sfnt_off00011659.bin
a922ed13e41992b06b1c110dadcc57ac8bf56e3a3a8f63d33db273dc84ae9faa
pdf-font-stream PDF embedded font (sfnt) at offset 0x11659 11060 bytes
font_02_sfnt_off00012fe3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE3 16792 bytes