Malicious PDF — malware analysis report

Static analysis result for SHA-256 207b8b74cfa521a0…

MALICIOUS

PDF

82.1 KB Created: 2021-09-05 01:05:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: be675242b1f7c42672dac5c7454224c6 SHA-1: befdb765ce56387efb0e4aebce4525d60ddf53fd SHA-256: 207b8b74cfa521a0900aef5b06016c2e6c36b13de8bacd35b9f276406310b333
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple PDF files hosted on various domains, including a compromised WordPress site. The document body is heavily obfuscated, preventing a clear understanding of its direct intent beyond hosting these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c970f3eb2eb---43873552543.pdf In PDF document text
    • http://takemehometomatoes.com/ckfinder/userfiles/files/nunowaxuwuxiposi.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/katevufuguf.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/xuwesoxerudelowekav.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/xonogumigezaxaliw.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cd4011713db---41223751537.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8b18a8532---dodilavafugeluxoxema.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/jeu7mvgv4bo03mlsv3tk8963lo/68108155608.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/dikevewepoloto.pdfIn PDF document text
    • http://surtek.biz/image/files/20150119_013044.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079c5d2cb83a---76237254317.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/5059183599.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/diselidoni.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610ba61fecd9a---2683648613.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607665a4ed980---lujoxilamibofejuga.pdfIn PDF document text
    • https://nepalaviationmuseum.com/userfiles/files/pixolufolo.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161140fbf34fd8---72651319862.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/renave.pdfIn PDF document text
    • http://giasudaihocsupham.com/Images_upload/files/72328048031.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/b336935bb5e5552b48bf9af8a0433da8/75481828759.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/99032284319.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+decrypt+pdf+file+in+javaPDF 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_off0000d887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD887 18744 bytes
SHA-256: e546106c649550c644e24d0dc6fd7886f7bbb55bdc3bd67d92dab16c668cccb6
font_01_sfnt_off00010a10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12227 10832 bytes
SHA-256: 8b9ddebc19e86a19104ae3c3ba520f77e3c6ac3ecc346cd3215668f3b1ba27f0

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