Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c876d96e7241a34…

MALICIOUS

PDF

71.0 KB Created: 2021-09-23 15:53:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 01af7784e2384a5a987eca96f5c36939 SHA-1: 3e50dfbbfc2a89aa91bb4393f95f6c940a63580b SHA-256: 9c876d96e7241a34cf50746d80a555e0a39f8cb9b65fa0b8b7a4728052b24bdd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The presence of 'utm_term' in URLs further supports a phishing or spamming campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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 https://garglob.ru/uplcv?utm_term=unblock+private+number+android PDF link annotation
    • http://soepcentrale-dekeyser.be/userfiles/file/94036490578.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/17721635245.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/43226586589.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/36142986455.pdfIn PDF document text
    • https://photojet.net/userfiles/file/55281052461.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/9622717379.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/2099684bb490fa9e118551312f518086/texoz.pdfIn PDF document text
    • https://ingatlansos.hu/images/userfiles/file/bolurix.pdfIn PDF document text
    • https://fiscalonline.ro/app/webroot/files/userfiles/files/kipotaw.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1614773eba0d5c---petitupurudojop.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/43461679439.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/vusosemodesisejabegov.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/05d02d9ede53619435acdc5a08072529/83745226024.pdfIn PDF document text
    • https://ksi-system.pl/editorfiles/file/15018997693.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/43759441488.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/31730312656.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/77487665423.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/lojukakikavevoxorip.pdfIn PDF document text
    • https://tadimtursu.com/image/files/levijafenitufanev.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/ac955ea128aa0702e3edf5d22987bcca/riduzimamazubukakogesito.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/97795969741.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/fanimifoxuxizuvaru.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/3524f02a537173b5488851d9a331dfe2/52361570217.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/lalaketez.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/mujalow.pdfIn PDF document text
    • http://ahchala.com/img/file/39841209609.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/tesufilekosumivupeluka.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_off0000b549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB549 15588 bytes
SHA-256: c0bf8faeeda03ba7d1448ff7b23e1ed7687e7124950d92d4e57ba06c5575acca
font_01_sfnt_off0000dcf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF0 10912 bytes
SHA-256: 3a2c9e2033d2da56193c80e11fe8299278bca6468616a498cb223ac8851c5340
font_02_sfnt_off0000f5fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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