Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d8de638ea1aee1c…

MALICIOUS

PDF

90.7 KB Created: 2021-07-07 03:47:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 08bd015f62672d51df6212fa755c18e5 SHA-1: a4636fcbf925fb03b6484712c2b6f7670f064fab SHA-256: 7d8de638ea1aee1cea39277a99d6af2e39e90dbcd1240538ca962132ff4ac419
136 Risk Score

Malware Insights

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

The PDF document employs a social engineering tactic by luring the user to install a browser extension or update, a common method for credential theft or malware delivery. The document contains numerous links to external sites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. While no scripts were directly extracted, the nature of the lure and the presence of external links indicate a high likelihood of further malicious activity, such as downloading a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://allytemp.ru/uplcv?utm_term=how+do+you+reply+to+interview+invitation PDF link annotation
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1606f363fb7958---43522961710.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/kkafst5p0k00037mhg5phjk195/98542365708.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607243335b292---xuzisitoburujozado.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/mugubimekusibusemezegu.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/pumrhpr7f6ku1hq3odvva5vc73/94799804055.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/8461558031.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607545765bed0---razatoke.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/19s91jui5m469msr7430ronvv7/82974582271.pdfIn PDF document text
    • http://centrons.com/uploaded/file/37770611660b48ab77a9b6.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083db8192804---junam.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160964c0b14712---dusit.pdfIn PDF document text
    • http://lbhodgereunion.com/clients/3/38/38e1f81cb1ac74d12d86c8ba87866b9f/File/tetisukozezitabozebe.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/27aaf6c27896d4c99cbbd6119646ac2d/gikeno.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/2k930sebj9iod29uo6cqpib6m4/kegabixapepixalezomo.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c31b6929151---35956677358.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/98498885347.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/f54drnhk8mhq7ofkr0t9o9k287/79778544159.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/2075007dfc4294ae46392aea00b8e300/lewedipo.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/5tn6p3v1ub0d8t2sp1u2t5mlj1/72952708510.pdfIn PDF document text
    • http://proxima-design.cz/files/file/tanupilelexizagugewuvoso.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/62314815885.pdfIn PDF document text
    • http://teraval.cz/res/file/40942715047.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160b0939a99a43---88019586848.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/b0a91ab79feb8c13966fcc7f36859f24/25346532306.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_off00010051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10051 17180 bytes
SHA-256: 32a9719b390a5c3c0cf6b0300cf3bf2491a14070a81e3dc8bdf901934cd27862
font_01_sfnt_off00012d13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D13 10572 bytes
SHA-256: abcdd814c4c6edbc46e36c979ef0a498ef39c0c39c14b33730b54f891d78a7cd
font_02_sfnt_off0001454b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1454B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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