Malicious PDF — malware analysis report

Static analysis result for SHA-256 c199305834d0cef5…

MALICIOUS

PDF

96.2 KB Created: 2021-08-05 02:34:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: cde32dfdbbebe0842f877aa5c35f3f4a SHA-1: 76fd8c6bfb32e34d61a369713a01f4a86bd56b1a SHA-256: c199305834d0cef52d0292c55ef2eb10e7b0fbd4ea0ebc4bf082de8d2306eb6b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://anandtouristcorporation.com/uploads/pusidokevekamixarurumude.pdf In PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e6a605e5cf---lefegigezosipujamiforel.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/murerenolefakigevixabafe.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/26785364057.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image//files/ziwevo.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/t9g6jjkk4g9o486rdend14h8n3/lelebexojut.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607684614134d---59552024524.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/mejenema.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/wefofud.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/riziburijeru.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/24495515011.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/77635603355.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/2df7c5022c3b3f5eb5024504f4bbf5fe/vesakisobifexoxotigomoje.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160857af0ee774---gazalekesizofuxam.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/2226e514e0edf64d19bae1c37e4311a0/tosulaxatola.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/47378666461.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/0f07776be43c548eb876d0fbc02ee021/97720069427.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/8cb17ba7d6a710f0a5a739756cb58e78/93890688805.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/tavawixiziwulidufakewibo.pdfIn PDF document text
    • http://limoride.net/gallery/file/libamisavumitesikujomavom.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/17332687931.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/85952704539.pdfIn PDF document text
    • http://skncn.com/u/files/fizubodinaruvulel.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/1jlm8ou60ckovrjd6m4hhh2t8t/4240329435.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/21392517436.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=charles+dickens+a+christmas+carol+movie+netflixPDF 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_off0001129b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1129B 17536 bytes
SHA-256: 421a73b1533b0775265c5a04a04340b2603e1e4eb8d289d23b4e8738117ca60d
font_01_sfnt_off00013fd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FD5 11032 bytes
SHA-256: b43b3eaaab0e5888eda0dfc268d6ac89f80a7d2b5b95c7888e190a75c4264e38
font_02_sfnt_off0001595b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1595B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1