Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8f00633ae5a44a9…

MALICIOUS

PDF

80.6 KB Created: 2021-09-20 22:50:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: a4d05f332900248caebaa53b24c237d7 SHA-1: bbe8a4d4b00954e063fb233bd487079a8027b8e5 SHA-256: f8f00633ae5a44a981a0d697ae668361def6b1e66eb92be0f3f5a1661db34c1f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier flagging indicate a high likelihood of malicious intent, specifically identified as phishing or a trojan. No scripts were extracted, but the structure and URL patterns are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://mobilaide.com/upload/editor/file/4316098806.pdf In PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/2700792090.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/kufam.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/vawuxamu.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/nupiwipavedawilogewal.pdfIn PDF document text
    • http://hakasasi.id/userfiles/file/bitabupemuno.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144075a8a88f---vuzofijaxolajoruku.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/56352613081.pdfIn PDF document text
    • https://dobski.pl/userfiles/file/maporilefekewawes.pdfIn PDF document text
    • https://kocarbon.vn/luutru/files/96300555589.pdfIn PDF document text
    • http://dmychadla.eu/UserFiles/File/galolafipurumimev.pdfIn PDF document text
    • http://medeeatour.ro/mm/file/vowenu.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/nijumalugozobi.pdfIn PDF document text
    • http://shanghaiqingchen.com/upload/files/74903308331.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e224d78562---27317156874.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/mokajewakeled.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/nenol.pdfIn PDF document text
    • https://uslugiinzynierskie.eu/eurostyl/photos/file/31564265900.pdfIn PDF document text
    • http://naphogacomposite.com/upload/files/90124189456.pdfIn PDF document text
    • https://atlantidegattico.it/file/28541726100.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16130e606c9fcc---20891008065.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/nolaxexivu.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/rapedekotono.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/93176638877.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/munesasasizenosutim.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613edb44ada36---topibu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+can+i+increase+ram+in+my+android+phonePDF 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_off0000d7c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C9 17052 bytes
SHA-256: 3960dfcb763af71c68a75a76de1186f142e9420f2cf6b96d6b07da53d61faee9
font_01_sfnt_off000103b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B6 10824 bytes
SHA-256: 0f7d3f64e7fa9288f543a62672c90e4bb53bd1815f20b504b3d503b4dd412099
font_02_sfnt_off00011c80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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