Malicious PDF — malware analysis report

Static analysis result for SHA-256 978832414d3b8f81…

MALICIOUS

PDF

72.5 KB Created: 2021-09-08 07:04:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 055a6e1dd9117214300bf67f225a53d9 SHA-1: 2d3f9e2c63dac018a92cb986373dbf4df65b258e SHA-256: 978832414d3b8f81e9ac68930a26bb81c6e5cda45015c464235aa5b1fdb3d959
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs pointing to compromised WordPress sites and other disposable domains, indicating it functions as a link farm. The primary purpose appears to be directing users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://laborke.ru/uplcv?utm_term=memsaheb+nimai+bhattacharya+pdf+download PDF link annotation
    • http://guojingmall.com/userfiles/file///femove.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/4itqtio4lsrt4fsft43oim9kp9/77380928101.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b6687455cdf---mogexijonuzegorevibe.pdfIn PDF document text
    • https://ivaco.it/file/96923576949.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/82295801256.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c84183094---63792808723.pdfIn PDF document text
    • http://proxkimya.com/resimler/files/66542571459.pdfIn PDF document text
    • https://rpitrade.com/ckfinder/userfiles/files/sunurox.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609620a8445db---69216874090.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/8ms6nnhf06seqeejqj2k9r7lpr/ketubemarorofamofaladuwuk.pdfIn PDF document text
    • http://c-amc.com/upload/files/92391185545.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/6pg1hudgan33t8uo351plbn68f/xigelevadopug.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a198914e0c4---jeropegapileluxifeviko.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/a9d389343f99cf439d13a512f4f128dd/53112308697.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/temokosenojonaga.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1608e832c366db---gavumixip.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/hrarcc57emqeber61fkbvmq4av/35013082582.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160979e78c4093---64596141284.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/k9egd3u18c9khhmttalt6lrn20/xoxirawifasilepanub.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/kovinuzulol.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d98ed3595d---30336913687.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/vamuzuned.pdfIn PDF document text
    • http://mixline.ru/img/lib/file/36744273482.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081e533321f7---dabijufupugukat.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ca710b4a9---pomedutamelizivuw.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_off0000b7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7F5 16336 bytes
SHA-256: ddae7b471feda63d202724dbc6e6980ae16ce6545bb5bdd0bebebfc466f59ab2
font_01_sfnt_off0000e1b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C7 11216 bytes
SHA-256: 318f4753f293d465e6cb6c436be97e08f11ff8138651fa3301a02755a8cf7084

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