Malicious PDF — malware analysis report

Static analysis result for SHA-256 c06897dd19ea6ae8…

MALICIOUS

PDF

89.5 KB Created: 2021-07-25 10:45:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a97c99f24ea515f983eb0c962f6d640b SHA-1: d365bb7aab99d9d1192085a37be529cdff1764cf SHA-256: c06897dd19ea6ae889e9b207fdf6731e4e4b7870506bdde857005aca6fc08b84
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution campaign.

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://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/50eknugrlp5t8mnb510k744qe0/mazogofuk.pdf In PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/8ee78811c6942e3819f48752afb08ca5/66252639929.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/73821270268.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081354a276f9---88803104387.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/lusurazo.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a4f62a8c4---lukaxepekisa.pdfIn PDF document text
    • http://akhsmombasa.com/clients/861898/File/kunegolimaruxewod.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/sufodaxisif.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8256ec9e1---92383070844.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/34465746817.pdfIn PDF document text
    • https://mfdesign.hu/files/file/41331168613.pdfIn PDF document text
    • http://solartgaleria.hu/images/file/50853577933.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/26371257208.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a99478d33e0---86995152602.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608926db17679---83285573935.pdfIn PDF document text
    • http://bienbao.org/uploads/files/sofedaxowaduz.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/36ac1da4feae32bf11f13e4dd16eac99/torinopujaredus.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/356a782c9279a3d11293513bc4ba3850/vefekutagegesakodokas.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/namivuzo.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/pudeni.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/9430d6f4cfa9fc0a15ceaa8d80e18a3f/kupugisenarubit.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/96720108403.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=seymour+duncan+invader+pickup+wiring+diagramPDF 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_off0000f77b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77B 17496 bytes
SHA-256: 1543dd6c7ae49eb85346ced221a9892c55a81a1dd9269a4bfdfcd37f5ebd326d
font_01_sfnt_off0001253d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1253D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D54 11076 bytes
SHA-256: 48a81683a60af4f933fb305eb59a4b8c2f0f9500eda181e6a9d59a9d67b8459a

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