Malicious PDF — malware analysis report

Static analysis result for SHA-256 159e9cedbee144c1…

MALICIOUS

PDF

82.2 KB Created: 2021-09-11 14:07:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 21c59142619d009e6da3b8afe99c7905 SHA-1: bcfd2aca75d1ebc2fa6010f2e71b8c6abb711869 SHA-256: 159e9cedbee144c143589a32b944036e0300697da4295ec3e1698b7447be7bce
156 Risk Score

Malware Insights

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

The PDF file was detected by ClamAV as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' and flagged by an ML classifier, indicating malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS upload directories. The primary purpose appears to be directing users to external, potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/64f39495c876cfe54e07131bc68a74d4/mawemor.pdf In PDF document text
    • http://dunakeszi.varosom.hu/userfiles/files/gadodukujexenomagogotodib.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/5820429364.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/nevibikapukotiru.pdfIn PDF document text
    • http://mfahk.com/upload/files/49672916873.pdfIn PDF document text
    • http://greece-ex.com/images/blog/file/figazirolotu.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136ab22f2a43---46451159181.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132b622a1f7d---30047143658.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210909171109.pdfIn PDF document text
    • http://vatlieubaooncachnhiet.com/userfiles/file/20549887250.pdfIn PDF document text
    • http://coytex.net/ckfinder/userfiles/files/43540900206.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/d64a67ba7d9b7a2d0cad359754f13703/93068690579.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/jugutetozexe.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/jukudid.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/begafidosawum.pdfIn PDF document text
    • http://pi-consulting.ch/download/98171375024.pdfIn PDF document text
    • https://exlite.it/ckfinder/userfiles/files/vexojinopiro.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/86124056408.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/10330207052.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/50134746176.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/18655861890.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/23406698216.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/ramuletegajinulewatili.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/jaaukpedbh2tvlr1fvk8j3latj/rofobe.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/vegivale.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=lego+marvel+avengers+apkPDF 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_off0000d9bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BB 19316 bytes
SHA-256: dc0fbefe415b3702ae897aea17b5e629e06fbeb5069e812f8e715a8f5e323fe4
font_01_sfnt_off00010b12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B12 10520 bytes
SHA-256: 1974aba9b4bf24686b254e52eaf953ac0a2879b37264892a22f98ec629e4e01a
font_02_sfnt_off00012303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12303 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1