Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0c609f7be1fce35…

MALICIOUS

PDF

95.7 KB Created: 2021-08-07 11:27:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 91974f791d0049d144c23ad088601416 SHA-1: ada310450e8916f18cf46ef488ee629e34da16b4 SHA-256: b0c609f7be1fce35e5fda71859ea2bcbc50af486893b7e4ecf4f245a76b194c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://archism.ru/uplcv?utm_term=how+to+get+night+mode+on+snapchat+android PDF link annotation
    • http://naplesredeals.com/userfiles/files/75626411428.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/02bd7940301d908861181e052c13128e/46327220651.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/661bd48322457bd9d7eb67c327d07263/fobabuvopejumokowu.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/0a7aa7b9d9a7ffa9488d680c86440885/6432742163.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf0b5819f50---79631159496.pdfIn PDF document text
    • http://mooneyes.pl/userfiles/file/72914032222.pdfIn PDF document text
    • https://linker.tw/files/demisasuko.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/npfbn2smvnuo193vmrco9nhtdd/kemuzirobanox.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/256e5b4ee4aa0dc9c9550353f91991eb/96942400769.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cc2747c56---87075517562.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/5498277124.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/c232fa6021e5592ae504bc106a08a1cb/luxetezorakalunojodaxuba.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2ab1a14fd---lanuz.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/a817d4ab2e5485a92516a15a8e3efd95/22791593955.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/161e865ab508dadd1e887bc56ddbe15a/52681024564.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-7/20210507062105685153.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/lowoxuvakajoropawexafes.pdfIn PDF document text
    • https://iguanapools.com.au/wp-content/plugins/super-forms/uploads/php/files/15s1gi82acqh6lj1f4o7uvh9mu/puxezonumuxuvomo.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4aaa6d5ea---3515589793.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16072cec053261---55936484739.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/5ec4a6db03aa0f043e464036efb7f487/23607387527.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/keninapanagutojubolirixe.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/bovodanidajube.pdfIn PDF document text
    • https://dm288.com/slicice/file/58964393485.pdfIn PDF document text
    • https://senhewood.com/d/files/6172284458.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA62 16344 bytes
SHA-256: 756b691c13b983eafa03e47aa9f0b6ad58d5b72d5a208688d70894321573a878
font_01_sfnt_off0001108d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A4 10992 bytes
SHA-256: b4f7cb0b7c38772f7eec85419452605d365899d820a636f91a9e66a1b7f8a3c2
font_03_sfnt_off000141c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141C5 17364 bytes
SHA-256: 23dd8f95ccbc25204ba5c15a53e9eaf257054598cb108c2ff0bec58cd99ca805