Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9a5e8b5d9302c6f…

MALICIOUS

PDF

76.0 KB Created: 2021-07-18 22:58:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1478178068533b7512f05b0315e1d163 SHA-1: 8632866d84948d110f84d3557959e6cb515973ac SHA-256: d9a5e8b5d9302c6fda66b57891c72d56650c22d512fe623d6c2cf05f1a7a0787
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. Heuristics reveal it functions as a link farm, with many URLs pointing to compromised WordPress sites, likely serving as a distribution point for further malicious content. The document body is unreadable, but the presence of numerous links to potentially compromised domains strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160acf1646731d---94792687870.pdf In PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/4a56a2a25ea766fc435ac2d3181c31da/76636228609.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/0a7d6b1734976bab7469d3a625907d70/56127754223.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a181aaabf85---dutilizi.pdfIn PDF document text
    • http://capri.lt/userfiles/files/63615551773.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608636d14c11d---rurosef.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/linul.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099207f2b6b9---94489994568.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/3acb3ff0080418471cdf32fc8b21478d/tubakuwarazifu.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e925e5da6---doruwomorizitasa.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160838927d4634---66375591616.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/57931424924.pdfIn PDF document text
    • http://haniltm.kr/upfiles/editor/files/29531851012.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832da2a6665---kiwofikigesuxoxadadivifex.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/d6eac262808c980980e96488ca1b06a2/42837622224.pdfIn PDF document text
    • http://vonkoenigsmund.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d95737b66b---35306371285.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/14804381991.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/97153089947.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/4c0ce08e248566587efe79c1b4e924f8/5602645604.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/b148ec8d73fbc8ec5b607f6c39004a86/norew.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a0acf27be98---dedotexalip.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/tutifatebe.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ecbf43fd6---wogiwatuladujuvar.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b05258005fa---pifazipiwowajekimevo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=talion+law+definitionPDF 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_off0000c7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF7 17012 bytes
SHA-256: 732fafd6f1b8e9c67fa0548a62d3f834cbd45d046e0b93b33df48bbd19f050ab
font_02_sfnt_off00010c3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3B 10128 bytes
SHA-256: 4ac1bdbc385344a625a1421b112ccc900308239283422d0d7d2663b6a6b9b09f

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