Malicious PDF — malware analysis report

Static analysis result for SHA-256 aee82c1ee0fd7fe8…

MALICIOUS

PDF

80.9 KB Created: 2021-09-17 04:32:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 56ccb25ae4323dbc87a50fd6bdf8929b SHA-1: 5d5b7c26587d3476827d5e13900656dc85892d4c SHA-256: aee82c1ee0fd7fe862372da49dfe4976006dc7c4d9ddf6064ce77c47c0ace225
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. The primary purpose appears to be directing users to potentially malicious content or phishing sites, leveraging the compromised infrastructure for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://queure.ru/uplcv?utm_term=how+to+cast+screen+in+android+tv PDF link annotation
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130a492d4fd5---28416222782.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/32e06447d489c8ed3a9e03b20bbf62b8/6421237599.pdfIn PDF document text
    • http://nessium.net/userfiles/file/73546894558.pdfIn PDF document text
    • http://thepducphat.com/upload/files/46069133646.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/34854383295.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c4e1a20bb---dudomipa.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/702ee311a82f893f3cb4412ce3c9747e/33663774493.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/nowife.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/99152394820.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5740029c1---40968302145.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/tewegazosafilo.pdfIn PDF document text
    • http://full814.com/upload/files/76287172362.pdfIn PDF document text
    • http://baove24h.org/upload/files/97172072227.pdfIn PDF document text
    • http://estatepie.com/files/userfiles/file/5459397829.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/basoze.pdfIn PDF document text
    • https://tigapilar.com/upload/files/mexupuwapijon.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/xikotitamijalidijipexalis.pdfIn PDF document text
    • http://touristclub.in/userfiles/file/xulegudezikowujux.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210905_CD8F27E1C0209B37.pdfIn PDF document text
    • https://bio86.net/userfiles/fichiers/53193991090.pdfIn PDF document text
    • http://faceconnects.com/ci/userfiles/files/68813034858.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_off0000d200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD200 10460 bytes
SHA-256: b42131f2839071d8dee72067c09128915dfa500f7cfd4daefe1bf6be9f3ec12d
font_01_sfnt_off0000e9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E0 20120 bytes
SHA-256: 27b33873f232f1dbcb09be0ea30b280196afceb03cab7daae320a7c1c73adf3f
font_02_sfnt_off00011e8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1