Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ce0c4a5d241f33c…

MALICIOUS

PDF

89.1 KB Created: 2021-07-18 07:48:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3fc131fa7ee1068cad2d54a3e02764f2 SHA-1: b9c4c5640433f1f2281aa141b490f6d2e9daf358 SHA-256: 9ce0c4a5d241f33ce8c62d1998a635195c33565f52bc13f03133075be657d1e9
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. ClamAV and ML classifiers strongly indicate maliciousness, with the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supporting the malicious intent of these link farms. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://cyc.cz/pictures/clanky/files/71866823165.pdf In PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/sjg98vijpploj8dsfj1o0p73t8/nezomepusaluwogirugeza.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839aa34e94b---80169875184.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/65787399106.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/70d923558806a6cb7c75269a8b03ead5/pipuk.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/0cp5an69c6gni09c2hnu275mu2/gupevowetojixizez.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/gubekenavexe.pdfIn PDF document text
    • http://renovator.cz/files/file/40100263795.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160976f529d718---26547745946.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/lapofuzabodutavo.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/18519675824.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ed2edbb55f2---fatexatitikelutiwom.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/66046792526.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160798f7f7bdee---novomufe.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7872a8b006---4655391972.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d50276d8df---nuselotatomobafekoneno.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/1653c68868e5f27aaf90010e56c26fa4/purotozezabusow.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/05b5247295a88156815538b1c5946eee/dukupenitilulugusajonoz.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/1c7e01e194aaf40c8c4d5650f0d53632/bimogiv.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/1bdcc99fc449360dd7026d94f2cd84ff/17050078439.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092cc1cd4317---jewigofufuxewomizeraf.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/3e89370fd5e19b38b871586c7cc16cb2/82194503688.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e09ad60c09a---2578907674.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=the+hunter+call+of+the+wild+bighorn+sheepPDF 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_off0000fb0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0E 16268 bytes
SHA-256: 52d552743d2e6a3a6fc77edf6bb7850f2d457cd0f08d6ab584a6097a6eb4e288
font_01_sfnt_off00012550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12550 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D67 11188 bytes
SHA-256: dfce4d786ec5ace87c7c725bfefb85c18187c1d1c64143408bda89ba25f71ca6

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