Malicious PDF — malware analysis report

Static analysis result for SHA-256 bedf3fb5806be599…

MALICIOUS

PDF

75.1 KB Created: 2021-09-08 17:13:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 51b5db7dd3555fba8ff224d328b625ce SHA-1: 0e1cd7fe96d77557d904d9e47fbab5bcc6501b0b SHA-256: bedf3fb5806be5996b5b96c51ff91efc75e961c3375e2653ad3082db9e6ac73d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with numerous URLs, many pointing to compromised or disposable domains, indicating a phishing or distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable due to encoding, but the heuristics and URLs clearly point to a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://855solution.com/htdocs/cljr/data/files/32823625824.pdf In PDF document text
    • http://faurerom.com/userfiles/file/91976639973.pdfIn PDF document text
    • https://mayersoffice.com/userfiles/file/93825897673.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/62296068051.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/sexan.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20210907182251.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76109728653.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/24772810050.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/ha7670d4nf3ubpfevh2etkvju6/losopuzujerekigetato.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f3ea67f57---kepidebubeso.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/sopiruzunonerotimam.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613363fa48a2d---83390264863.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/demerosorexivujarofeda.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/55964068900.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/xerunodojiv.pdfIn PDF document text
    • https://livewireeventz.com/userfiles/file/13112350268.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/gumewerikuwalemabojeleli.pdfIn PDF document text
    • http://parikshitconstruction.com/uploads/zodotuzepuwakikurezif.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/11700416663.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/gebite.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/xunuvirowemolazezagoduf.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/71269757504.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/remopibobarupevatax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=cbc+test+report+sample+pdfPDF 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_off0000c2ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dafc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFC 17080 bytes
SHA-256: 854235767db8a0cbd8a0b3355fbc9f8055354239b50526fc20df50095420e658
font_02_sfnt_off00010695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10695 10756 bytes
SHA-256: b319d5809b0f32f36b64120c97a39815f008f2cccdf2d243768e042a1e6c9c66