Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7a5b8eeb9ae7d54…

MALICIOUS

PDF

74.3 KB Created: 2021-09-05 17:38:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c2e8818c6dd427807f03a1f6561de9d7 SHA-1: d7682a629ef3a7fb4b1d95130c9d5c5fd39b6b7c SHA-256: b7a5b8eeb9ae7d546989348190439140db312c21fecbe3768420378818f4733b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The presence of multiple distinct hosts and UTM parameters indicates an attempt to distribute traffic or obscure the final destination, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/2b1ca5e6f2ee06947ee20cf26e23e1d9/57351680186.pdf In PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607374337fbd0---93099642503.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/valexofirasilanez.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/73948334221.pdfIn PDF document text
    • https://pavillonwohlen.ch/userfiles/files/mokedumeve.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/rexojesatux.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/e6195886580312d4ee375be596768bc4/kegupifur.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160aba70e663a4---xugodejinowokapawewazewu.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9b80b1eee---75461443201.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/32653998743.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/3864037327.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1608896cdb22c7---98803400716.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/sezelenufisan.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/38135880224.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/55623458668.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/9b75c6be9d401b10ebbe452d2f2dcee4/87047592992.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcd86106b6---43409595738.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/supesig.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/85404570386.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/zumotetilarokupomozad.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/d67e549619f5a5d32d13b4ca7bd18ddb/70164883721.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/20542799412.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/v9p55o1m0itv4g0k4g2u1la18a/volibi.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/kabuzugegupugagijuki.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/lajitokezulidaxuw.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/87743432626.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/basij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=vilso+tv+antenna+outdoor+amplified+manualPDF 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_off0000c36e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC36E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB85 10796 bytes
SHA-256: 225f580e956349cfdc07abc0cfa53521556b942b3e36c5164b4372e3c8a56dbf
font_02_sfnt_off0000f461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF461 15452 bytes
SHA-256: d9c0f4335ca8eff057178170e867fff7dcc9d3c63b9bfe2ea19376bc33d300e1