Malicious PDF — malware analysis report

Static analysis result for SHA-256 80dd8539a2e4fe23…

MALICIOUS

PDF

94.2 KB Created: 2021-07-26 14:58:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2ca58b1e945aa35e4e4c3635a27a84f7 SHA-1: dfde8a9e6005a22714420f2827b800537b557c71 SHA-256: 80dd8539a2e4fe23447c7161256df3f85d8c14c73388a6930abb7c26ed546906
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute further malicious content or conduct phishing. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics confirms this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/286f84dd90742af02fddd934fd793eda/gevevanini.pdf In PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb1d505046---tiguzudumanesomi.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/g4h3k9ovpd5q5arkd6qen9fv21/kikifekanimekitivifor.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b4708fdb25b---38288358419.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/57507552272.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/66642286172.pdfIn PDF document text
    • https://kleinimmobiliere.lu/userfiles/files/16924472590.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608dec7fac2fb---8954613575.pdfIn PDF document text
    • https://asiahijau.com/contents//files/fetoguzabun.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160fb24935edd3---33634438880.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee56282061---puzikitivalugiruves.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb88380fa9---sagimu.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bf27b3323ebe798f4b96492da6a4577d/11996907120.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160924ab933373---54036908082.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf9b5d2101---74704957239.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/85027116745.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4693e1522---fuwogifarujufav.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16076fc6a346ea---38536249038.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/f79df9213005e71fcddcb1981365cc3a/72601769506.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/donovixisoluvogibetuwi.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/latifesijujas.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/46879873630.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/kobaram.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=traducir+libros+pdf+gratisPDF 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_off00010aa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA3 10760 bytes
SHA-256: bdc4ce9c1f670f986ceae416721bbe9c989ef207f9c3562d1aa328421b8450bf
font_01_sfnt_off0001230b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1230B 18124 bytes
SHA-256: d745504d2202acfa07d2d3491c1f3bfd74eca9b77d4578dbcd69b9fac6af120f
font_02_sfnt_off0001510f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1510F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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