Malicious PDF — malware analysis report

Static analysis result for SHA-256 25246bb6dd08d0b6…

MALICIOUS

PDF

87.7 KB Created: 2021-06-28 17:29:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: f3d6e42d1fa680a37c096df4d2f5e03b SHA-1: 4f36981d346ea1645e5faf391b598f7e6563c6ef SHA-256: 25246bb6dd08d0b6ecf5e6720950cc22d8a3e135cf14399c17e6051f0fc31bfc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress installations and other disposable hosting, likely intended to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, but the presence of many external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://drafthe.ru/uplcv?utm_term=living+environment+regents+june+2016+answers PDF link annotation
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/8at94r65bugnvkb9bhls01gcq1/91500519057.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086cf92aa9f1---32053083358.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/44952008114.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608ba9bb7533c---sezidaf.pdfIn PDF document text
    • http://bomtvcloud.com/data/board/file/20210511233415.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c48392888---nitaronefafo.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/12700955216.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/28f36367590799b497e0cd504e069c14/ronuwelupikemi.pdfIn PDF document text
    • http://resheto.ru/users_images//fck/file/wusuvirotozetizim.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/82f7ba722e840edb5162800bc8373822/witovopelarelesoko.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/f1t0rtl7a23hnrvui0ncda4q0u/32015314650.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c1609ee8122---21302838693.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3f28a330fa3c9dde7228efe37149282c/41559457728.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16099fde988795---15728775638.pdfIn PDF document text
    • http://dgjst.com/upfile/file/80776818150.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b091e8ed8ec---mugesa.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb080acd7df---17066701915.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/winamusomudunugi.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/8b1ef22268e4b668b944fc6cbaa3c9be/83786246450.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/dd196e525d5c261fa73984a9243a0ee0/87326370000.pdfIn PDF document text
    • http://sodrex.pl/userfiles/file/34636648363.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/0b118c734ea288982efb7e442411b44c/44942894296.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_off0000f29d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29D 16872 bytes
SHA-256: 4e69d417011c0a21203b15b9d909eda0faecc4fd3ee5f7c3c033fac30b02cd5e
font_01_sfnt_off00011eac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000136c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136C3 11204 bytes
SHA-256: 9e2d3dc5bb12ca648ecb89a470ff59d87d7224644fe5364a393cdbc4e9f23866

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