Malicious PDF — malware analysis report

Static analysis result for SHA-256 89c31fa31f8938f4…

MALICIOUS

PDF

88.6 KB Created: 2021-06-30 03:20:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 382788aed5172c83ba7a6fa8d2074b31 SHA-1: e1fb440bafc706c0ac37d8c60402b08c0d682d09 SHA-256: 89c31fa31f8938f44cffc682ac890115478975602d4e7bd1bc917070bc477e84
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and compromised CMS upload links suggests a coordinated effort to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://wastran.ru/uplcv?utm_term=ppsspp+apk+pc+download PDF link annotation
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/dhfvuma7970k50sh4q8msffdeu/nadikofogubolidesiju.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/jifaxetowaf.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/lavefob.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862f961bd55---kopuxolubega.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/2p4ci8mejj7rcq6mt7lm0gdua2/rukelimiza.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/96660966836.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160981c25c5436---92507469006.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdc8778628---firulumunoda.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad40071cff---48219722138.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/nufatijarez.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d01a1d830da---lafozofojapabijofuwe.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/88402851526.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d08d970469a---66489942596.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087a4b83d517---3955461150.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/h7csd38qbbbvbl8jo0kpf6cmec/32127720421.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/jujenog.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083337804ed0---44355797597.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/3f1fc8895b89c44a5777f6a0c8fbe40c/26459099872.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b760704f90a---97098123122.pdfIn PDF document text
    • http://apartmaji-zunicmile.com/uporabnik/file/vokidajifa.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/360fc0f0cba1dc249c95c425fe5d3f56/tazosesujedalotakejesofev.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_off0000f78c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78C 10264 bytes
SHA-256: 8a50bb78be390e30fa5cd1146ff444059de19a338a22e1141e7a5bcd1cbf4cb7
font_01_sfnt_off00010ed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126EB 17912 bytes
SHA-256: 98a43803db12a999b34b4a6ea736771e97b988a4771215c8f68805c41484aaea

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