Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9cb5d176c4cd05f…

MALICIOUS

PDF

78.4 KB Created: 2021-09-07 04:13:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 37b487399ae0afe3efeb7a2799994153 SHA-1: 32a8cce8b5b938cbac6ca96f0fe38541cc6410be SHA-256: a9cb5d176c4cd05f39d2a64f6a2e9132b0d0de6cabaf5939848c766f56931fb6
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised CMS upload directories or acting as link farms, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are indicative of a spearphishing attachment, designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://coretry.ru/uplcv?utm_term=2010+toyota+highlander+service+manual+pdf PDF link annotation
    • http://tycoonmedical.com/userfiles/file/saretorinudenejas.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/2381a4ff4122c7c2fd65dcb3be4d3343/40835017289.pdfIn PDF document text
    • http://jingkangchem.com/upload/files/piviligituxunoje.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/25850438238.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/90431208414.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/kesopamib.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/etlrjsjnchk918vrahis3nk6n8/94859944470.pdfIn PDF document text
    • https://mauspro.net/upload/files/94569619936.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/ddcf0d444e3f32d7ca5569e185a2d1c3/78084103542.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/jofovademirodalazokuvo.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094148582641---61287519261.pdfIn PDF document text
    • http://walthamclassof1985.com/clients/5/52/52060312c10aa816a718e90a19a6a7a1/File/28560740865.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/84934565979.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021052921121652.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/takalitupode.pdfIn PDF document text
    • http://artospace.com/pics/file/5368794062.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210719145435_yaxt2a.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/lusonasobitesilasolare.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/15c967b0c012cbb2ae49605f92c32b7e/96299524008.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117252f9f256---fonogusober.pdfIn PDF document text
    • http://surausa.com/uploads/files/29849685807.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160876a2b165fe---mubizazepag.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb744672ac---43236732392.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/sovusatibomabekanidaw.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/paxomalobu.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_off0000cd8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A4 11544 bytes
SHA-256: 535151bb0efa3cd87a99eeb19d53371eb05bb1ae71e5b73dd29b4d0e8158446c
font_02_sfnt_off000100ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BA 16632 bytes
SHA-256: ac31560fc88dc791846b9b809afa9741f1375c83a32f38dadbd92e88ac0db40d

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