Malicious PDF — malware analysis report

Static analysis result for SHA-256 796c4dd500cf748e…

MALICIOUS

PDF

83.4 KB Created: 2021-09-17 06:35:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ce37599f4d3ffa46e933a8f728c48276 SHA-1: 78748670d561efea564ff4bfe5708b08e587334e SHA-256: 796c4dd500cf748e8cd1aace3be612fc6fe3e7a18b8caa97d4d78689d10bb805
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and compromised CMS uploads. The presence of these links suggests the document's primary purpose is to redirect users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://infrive.ru/uplcv?utm_term=in+what+phone+can+you+play+fortnite
    • http://www.bsa.by/ckfinder/userfiles/files/zawerodosopu.pdf
    • http://bakefruit.com/uploads/files/202109051721085642.pdf
    • http://burelomdo.com/ckfinder/userfiles/files/molobituvakemuwinirip.pdf
    • http://hart-metale.pl/gimnazjum/userfiles/file/89497518129.pdf
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614039171d5fd---bimeniwimarunodevor.pdf
    • http://uptindia.com/newsimages/file///27508923658.pdf
    • https://ewastexperts.com/userfiles/files/momilejawawu.pdf
    • http://incomingmakedonia.com/files/files/xatizo.pdf
    • https://stw-nowogard.pl/download/file/jifinigetukazu.pdf
    • http://wwm-quanta.com/upload/files/85454209046.pdf
    • http://wwstationery.com/files/file/memanixupomiwaxobumo.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1614300b44d3eb---21853693408.pdf
    • http://peetersinstallatietechniek.nl/upload/files/gedetumatis.pdf
    • http://mim2010.ru/userfiles/file/97055801028.pdf
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/20302090736.pdf
    • https://aluvioneschicamocha.sinecsas.com/ckfinder/userfiles/files/zaraligaxerodadoberaladeg.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137842e8328f---1785878123.pdf
    • http://patriabrno.cz/userfiles/files/92346162357.pdf
    • http://web-news.eu/www/pkpar/userfiles/file/92049187611.pdf
    • http://firsttimehomebuyerstudy.com/images/file/39329910187.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386b45a097b---18052850468.pdf
    • http://hak-al.com/resimler/files/25726966229.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/9a11faf5f0c550f5c5af1daf4d67a34c/87483444402.pdf
    • http://laboratorioshamalab.com/userfiles/file/xijorilemakuramo.pdf
    • http://dmkert.hu/files/file/88342013891.pdf
    • https://efsanepin.com/calisma2/files/uploads/fusovigi.pdf
    • http://unseretochter.ch/images/file/fuzolalebiwosigupenotafu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df96.bin
7c933969866ad5f9fc7ee910c17586a609b73f31f3969f6ee627288f2f8a98f8
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF96 10660 bytes
font_01_sfnt_off0000f7fb.bin
5df872e962e1c1cc959ceb02e37d5605339fa855b27f8d4bd64e8a20b920eb25
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FB 18088 bytes
font_02_sfnt_off00012741.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12741 16792 bytes