Malicious PDF — malware analysis report

Static analysis result for SHA-256 13b2643ca33ed334…

MALICIOUS

PDF

84.3 KB Created: 2021-07-08 07:43:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7dd3c4277a9f3add84a62e9a0974769b SHA-1: bb1f1ec372029366a42fb9154cd51550ca9e9ca9 SHA-256: 13b2643ca33ed334956b3773f7c18379047eff70344855fa6d2eac866101404d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress installations and disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or SEO-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://cructi.ru/uplcv?utm_term=5am+pst+to+mst PDF link annotation
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b1279e10372---79114088226.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/94308431320.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5f8b6415b---86348965630.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb3ff1b0e45---zanesedositatufepapo.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/koxari.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/18968455573.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/46n51b78csrm1sa6153crji520/rijurubulatidaguwok.pdfIn PDF document text
    • http://notarbrazda.cz/userfiles/file/pabosop.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/vuzekiwirelede.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef44bbb4e7---83932158997.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/pokaxamugej.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/54696090626.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e24296da7b---98500316928.pdfIn PDF document text
    • http://wamer.org/userfiles/file/76280437501.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/veziwinuxese.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/230492e35c0087c77ab1f19699381da5/82847941574.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/okp9u84sjeua1higjj9jnpkqo3/91135795535.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/kinira.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/16261065103.pdfIn PDF document text
    • https://transit-connection.com/userfiles/files/98944209812.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0bb448daf---69024091626.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6d759cc91---6157999455.pdfIn PDF document text
    • http://www.heksan.com.pl/file/794970584.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d7f174102---87203096374.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_off0000e3da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DA 18636 bytes
SHA-256: 59743b195720aff071823ab193bd1d620300e53cbb0a76709df5948ea76fade6
font_01_sfnt_off000114a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A6 9976 bytes
SHA-256: a654b1082d382105c5ef85d4d09a7aa38b884526cc17007bd92d73a603b6b2fa
font_02_sfnt_off00012acb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ACB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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