Malicious PDF — malware analysis report

Static analysis result for SHA-256 8313102dd02e7cda…

MALICIOUS

PDF

77.2 KB Created: 2021-09-24 15:55:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 43ea30c8caec6e8029021a6f9f578d98 SHA-1: d4c4ef51d8aa36b0c3f14c7c57a1e352535e0ca8 SHA-256: 8313102dd02e7cda9099a80848f6ca5d731a7cd803328e4f9c560a74e771b429
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. It contains a link farm pointing to multiple disposable domains, suggesting an attempt to distribute malware or phish for credentials. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://activepymes.com/pub/file/23056158489.pdf In PDF document text
    • http://alacarte-design.de/userfiles/file/pugipubimeweko.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/zemiwutupufakulejupufi.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/37767263269.pdfIn PDF document text
    • http://sibmaxi.ru/userfiles/file/25732467800.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614647db43d66---86796904187.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613af5ca6ef61---zorubonikuxep.pdfIn PDF document text
    • http://gameometria.com/assets/ckfinder/core/connector/php/uploads/files/47697976638.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/92746631483.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/43560441885.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/66268f4fe575225ff1d1508ac7b7ced1/8803755318.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/12630880208.pdfIn PDF document text
    • https://akconta.com/uploads/files/diralodoziwuvekilezif.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e8d101889---92509955544.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/26225887418.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/lowozewewiva.pdfIn PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/82045139039.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/wuvigelurodejusutub.pdfIn PDF document text
    • http://juditphotography.com/picture/userfiles/file/18512932374.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/38805210582.pdfIn PDF document text
    • https://strongpointmarketing.net/userfiles/file/xufafinufipizesisotodi.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/nifinijokob.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/22651224764.pdfIn PDF document text
    • http://kayapalinakliyat.com/file/77526484140.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/267da51db6352bfb15e1ea982ce3d003/59457931185.pdfIn PDF document text
    • http://unesco-mediain.cz/fckfiles/file/sulifuxaditoviwenabij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=download+camera+360+versi+4PDF 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_off0000c480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC480 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC92 18504 bytes
SHA-256: abc33149f8d5246534f4ed4163cbfea5ac0ffdfbf247639b52fa86f0e8195c1b
font_02_sfnt_off00010cf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF9 11128 bytes
SHA-256: 5a305afc3143523f7ffbb460afe2e77892fa47d132c0b8eb986cea0e1745b2ae

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