Malicious PDF — malware analysis report

Static analysis result for SHA-256 213a07df6a2cfafd…

MALICIOUS

PDF

83.4 KB Created: 2021-08-21 12:48:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7f2785bcd4bd1f4815794480ece4db20 SHA-1: 9c56cabce3b03d3a234020b24bd2a3ee29aebb18 SHA-256: 213a07df6a2cfafd1887efe3a2b389777c2e6862a5a2fe42461f2a5544611124
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm pointing to compromised WordPress upload storage. The embedded URLs, while some are marked benign, others are unknown and hosted on potentially compromised sites, suggesting an attempt to redirect users to malicious content. The PDF structure and embedded links are consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609618a708ca6---80359921514.pdf In PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f6f6d254a6d---45711844711.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/fazakawibonazabaliwap.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/11730993176.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/41239946838.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/8j6c8kt1q2r8thgi77m2600re0/darenebus.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/dba149db6ba0b625fccaf9830fb2252e/naliriru.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16072679012ceb---varag.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210701_072620.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/e0c9abc7fddd97fbee5657bfc3bd6cdd/28891736743.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/momuxuninebibaduxoxi.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/mbdbqokd6iskfasge3n2ebl6h7/velozataxafemewukej.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad0c309ef1---gefapaliwuwitidaredag.pdfIn PDF document text
    • http://cloverpark1959.com/clients/51168/File/50556696895.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/34089137221.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/doziwakavulavusoxo.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/0nclaek767j9fph9cnooioo2gl/gebuvefipufadakimuv.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/46349157987.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1606f44726ee4f---6510184415.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/84a2728e08a4d033e1b225e503674af9/75784009849.pdfIn PDF document text
    • http://keysrotary.com/clients/d/da/da683cbc30bfd632b0b364d14bdd38fd/File/10492005944.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/jvm9uoass9ihbbe4t9u8j4oco2/leveriburejigodozugax.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/0677f83a7f622db978b7819a6f189b62/30204554022.pdfIn PDF document text
    • http://bangtutrang.com/upload/files/lidudatom.pdfIn PDF document text
    • http://halmar.info/userfiles/file/tuwuvar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=millionaire+success+habits+the+gateway+to+wealth+%26+prosperity+pdfPDF 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_off0000e2a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A1 10940 bytes
SHA-256: 7c4511ad6122c799490dc306369511a524205ae7018d84e03576953337339af7
font_01_sfnt_off0000fc02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC02 16612 bytes
SHA-256: 25f5ec375b6e93134ccfb3c568e0c865a0b1d7bae1a225151898ce4b1bfa2d08
font_02_sfnt_off00012759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12759 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1