Malicious PDF — malware analysis report

Static analysis result for SHA-256 9910f0c5fec28cc1…

MALICIOUS

PDF

174.8 KB Created: 2021-07-07 23:52:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: bcde95b509d199d34c33ee79ff647f29 SHA-1: 15819842e04fba27c8ba5da19c0ae7ddc647e05c SHA-256: 9910f0c5fec28cc185d97e739ec594bd2fa221bc6b07307fea44d0eb0f12306c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload directories and disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and link farm nature of the PDF are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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 http://okmarin.ru/userfiles/file/bedufotinitamiginoz.pdf In PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/d7db39291d2af579ae515bbac87686c6/tigapud.pdfIn PDF document text
    • http://pettwayfamilyreunion.com/clients/39389/File/nokiferafotow.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/ccee4a1249324993ae9b73e157b558c3/weropujaposefibekepalabof.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/dqgn0miutksm772agvadbrpncm/89757153040.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f340179ec0---kofofetufimakawabuxi.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/5088d223fb80ec2ca9b04dfacf2241fd/29635600646.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/8295787697.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210702_03A6B90C696B1045.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/99558082446.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/62f562a62a5d44c4dc9de5ca26cda83f/85604809033.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c86bd18671b---57400508445.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/39821910806.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/3689f081a060c5a7a3471ea862adf640/zubonuvavawiluwilomubu.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/l3r4itrmgghnueo20cet7d4up7/linapewakozipotonikumol.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/65e82711c973918ce1f738f0770b6a0d/14022771641.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/75351214196.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758e0cd820f---73677852859.pdfIn PDF document text
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/2918501205.pdfIn PDF document text
    • http://mldinsaat.com/image/files/fisozizabetiwapubedaret.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/7690402933.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/40867020288.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/53318496741.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=onto+one+wordPDF link annotation
    • 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_off00024fae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24FAE 19032 bytes
SHA-256: ea2bd936a2fda6522ffea70fe1a1d8d364a35618cdc22232af10e7cf921adf52
font_01_sfnt_off00027fcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27FCB 9884 bytes
SHA-256: 0322148efdf811f80e1d8ba93a153d3c9f4a8135b9bf1715b9373b37268c13e9
font_02_sfnt_off000295c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x295C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1