Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9dc83532dec1ce6…

MALICIOUS

PDF

104.0 KB Created: 2021-06-27 04:29:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4af1f2b88068fe8a66057469d13eec61 SHA-1: a433cc50f6a5f9691d0f40d11bc7d2c0378e31ef SHA-256: b9dc83532dec1ce62f5bc424aeac39e9dd88a946fcb962f890e89a786365b881
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of multiple PDF link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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://zafirkort.com/uploads/files/nupisipomegizewi.pdf In PDF document text
    • http://metapolar.hu/tmp/83963343720.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160803110b3194---97616671832.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160866cbec5a44---poxexedorisetitapabu.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/nemujuwisonifekazijutip.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/uup1e6but7ggat79t0nasikco4/morugakevotudifofejef.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/24d97f6ae178ecbb12d672b7a7509b5d/nirimanisazuzafezex.pdfIn PDF document text
    • http://liyangah.com/Upload/file/vuxexolazovivugimife.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/1610587112609adcc3ad59d.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/ok1ch43r2fulmuetve3bgm08q7/tinomowe.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/0jrbufab050u4q2m6ig6je37ci/fonaguwamag.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/9425467284.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/6a4be9c8e14455c1c8c83c149a52d461/mivek.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/34068190924.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/zilavagu.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210606014817.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/v4i2g8t3c6q349rnbslm06uv43/80280852694.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/73407166990.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070985b1c060---mepupereroserutuxoromulus.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a848782c5ac---gazusutaned.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/2d6b09e26ad35e9e8cb341b40d2a32e0/14494165266.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160950d181b3bc---xuwovinabaviluguva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=dance+monkey+coverPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011f5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5C 10260 bytes
SHA-256: 5c34d105de5dcc2869ccc51de3c51fbc750ccfc2bdeca98c1e1cd05a42b1b907
font_01_sfnt_off00013667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13667 25108 bytes
SHA-256: 7a77175b167ae9b3ea72a63afe6ea410a79aa2c8a243e969c05be244ba7209e6
font_02_sfnt_off000171cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000189dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x189DC 1856 bytes
SHA-256: 184a936bd1ce5dff700adc4e6a12c67a52a21ba3f6bd4f31defed58e18ed8b92

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