Malicious PDF — malware analysis report

Static analysis result for SHA-256 dda81ab9cf8ef64a…

MALICIOUS

PDF

83.4 KB Created: 2021-09-05 00:13:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5c3e12a98d3af7fd912a04cf9cb27a6f SHA-1: 8dbceb6aca5bbdbee971da9990c80a318e8f3cd3 SHA-256: dda81ab9cf8ef64abd243e3036c859c25edc8f5ff93a21ffcf741f7647914c1e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a machine learning classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The file contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted from this sample, but the extensive use of external links strongly suggests a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://catamma.ru/uplcv?utm_term=drones+in+construction+industry+pdf PDF link annotation
    • http://rollfactorytogo.com/uploads/files/suxifilebenuwix.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606c866ede6cb---46203152345.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0fc5e56652---xurumiwubu.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/zujevivojudazo.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/94761449206.pdfIn PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/tavoguzopakanoboxugokez.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/70894457291.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/50853456408.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/61603368460.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/zajivunajidav.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/16816254545.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/92195370859.pdfIn PDF document text
    • http://worshipedia.net/sites/default/files/file/70951639183.pdfIn PDF document text
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/wogowitoxaf.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/befa5a9c2a81bd477299f7fca6744150/perogaku.pdfIn PDF document text
    • http://msdoubrava.cz/foto/images/file/regisodonugururozupa.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/loxogipawililakofunureno.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/54912129549.pdfIn PDF document text
    • http://icsbc.ru/fuploader/file/fexipedopawojefedokituwe.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/7da1e6237c09db5973dd1bceb0e9e0bf/dafol.pdfIn PDF document text
    • https://gplacestracker.com/userfiles/file/futewuvepezolexidososiv.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/f0710b31fdfedf3270068d3266a9f0eb/vajumijeg.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/xokodagirofavuradoxuke.pdfIn PDF document text
    • http://atomleasing.ru/media/File/xededebajabodas.pdfIn PDF document text
    • http://hanleyresources.com/images/loravifadabotivowifafuruj.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a1ebb284d---79543315834.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_off0000def0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF707 10620 bytes
SHA-256: 55ee7636cc8d0176a9464a3ce6a761215ff8bb5eb9b08e6fcf5540694eb4456d
font_02_sfnt_off00010f7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7B 18468 bytes
SHA-256: c5796570cd9ce39d281f9ba62f8a3cbf526fa4e3c02a8a0e5124fc25766d32b3

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