Malicious PDF — malware analysis report

Static analysis result for SHA-256 32ef7d49b3cc8ef8…

MALICIOUS

PDF

101.4 KB Created: 2021-07-07 08:35:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: deecb0ab7d4630359ba05eaa772c2eff SHA-1: 733d1042e7c8424077d565a280ab571ec6f2c56f SHA-256: 32ef7d49b3cc8ef8455c66547caa836252ac7109a23b5e6643de71e071472036
156 Risk Score

Malware Insights

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

The PDF contains a link farm hosted on multiple compromised WordPress sites, indicated by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to phishing or malware distribution sites. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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 http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074857571b93---30634109940.pdf In PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160987b76a3491---41625080630.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/9d0f6c77157e4875c33565bff99692b7/11586185841.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/prjhg7vlvdfun5qb45hvbev0h4/67631403711.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/92d3d9ff96b843212b45c92814340e78/29313504.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094872c5fb6d---zesedoranuniwudap.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/70028917311.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/30080749366.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/nilemapiku.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/2a6ba2464190eb56411ba41726cf23f5/bezimajulofixegunomi.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/a802ab4d974ecc7c8cdd0a803909475b/42597658815.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c33d15e64f---37584467373.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bca11ebf88f---makalazokujotozabewe.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/lokanodobuz.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a008051dcd7---20405566520.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/hh9m0qj3si9tg9jb1q18c2t9bn/viborubasogevasumugat.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/92625977322.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/lobiforedavaxijavesufalaf.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b7114d0db---87229714139.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/692ace700c90466f16250919e51dec46/nivejuromakijikanakoz.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3992dce799---zusetupufavukujuzoder.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/2u8sciipvdgm9d7bm0tcufs1lg/wapugidu.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3e650cb8d---46400229464.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a44f8e26722---sitemukuvos.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/9bd352622efe050a684f372f922fc7df/43087373612.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=tangible+service+examplePDF 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_off00012925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12925 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001413c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1413C 10768 bytes
SHA-256: c6094fccd8c08f7ecd7cbfb2e4c01378d8608a91b282bd8d92d2a536cba7f506
font_02_sfnt_off000159d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159D1 17436 bytes
SHA-256: b5621d4b5b81dc3e3e0a269f9151570301763d8b9f31df93b36189ece7c530f9