Malicious PDF — malware analysis report

Static analysis result for SHA-256 31d21d7762321b92…

MALICIOUS

PDF

88.3 KB Created: 2021-07-04 23:45:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ebc8f71d130debba3de3a129e63b5506 SHA-1: 8021b173339a486fba5e511adf6cbb4c79f26a82 SHA-256: 31d21d7762321b922e0227c89ada3d0bb6bd83008d2175f788fc0701a8613e08
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting it's used to distribute phishing content or malware. The document body is unreadable, but the heuristic firings and URLs are sufficient to infer a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://catamma.ru/uplcv?utm_term=purpose+of+the+calvin+cycle PDF link annotation
    • http://blevy.com/ckfinder/userfiles/files/57735757899.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/d5f765161e779e6ca3351b4d1e71619c/wolurodaragawusi.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/16879941583.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/49618649846.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-6-24/20210624013035135797.pdfIn PDF document text
    • http://garderoba.sk/images/_file/legajefojatavowaji.pdfIn PDF document text
    • http://contentworks.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4bcf492c3---watirarebisuzekezonemosif.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/49337366644.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/2i4v5m6j5evchqjm0ik3botd02/norodijeziwunuruselufov.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/31958836466.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/6q0blhn53olosil65j7gqf2vi1/vodumoxevo.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/qdelufefva3f42bdaj1l9k9v01/jewadosuvuzazikipuxebax.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/gidozelasakobasefofob.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4e3463049---muwezojiforiratik.pdfIn PDF document text
    • https://securityguardsupply.com/php/uploads/file/72786547591.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/63d19ad38f74f7beeaa7573650390af3/38374564468.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d147e12ef---89506231956.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/wisufij.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/1ec4f31d0e05d44185c41a0bfd4d22b3/tazevoxefitixipi.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/86972069671.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/todijajog.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/777cc38a34c348e12e8d499198955238/71197888178.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f43b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C52 10856 bytes
SHA-256: 39c2de6f37788f1ff29f8570abf75455ff2a938d7590477f7a601418cd78279d
font_02_sfnt_off00012567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12567 17744 bytes
SHA-256: 58cc2456939996daac40604c08ed3d4d39eb2bca0d10aa88b5c74e4a02ac9b3a

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