Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3132fcaef99878c…

MALICIOUS

PDF

82.3 KB Created: 2021-09-17 08:07:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 09d8530274c1ee1b9d8e342ff802fbd8 SHA-1: 02e0e7a407c980d9f35248da6bd3756979bb2e8b SHA-256: c3132fcaef99878c19bd52e80f14ae5387feb178834782c8076bdd63bdc54d05
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous PDF files hosted on compromised WordPress sites and other domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malicious content or visiting phishing sites. The presence of multiple external URIs and a link farm heuristic supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://shirbandifelt.com/userfiles/file/54132365121.pdf In PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/2b55dd4618089e359f5403bd1d9e930f.pdfIn PDF document text
    • http://imhang.com/fckeditor/userfiles/image/balevixasatabefuxasuze.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/78147702824.pdfIn PDF document text
    • https://zlataraburmevuckovic.com/files/25163767382.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/67697059981.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/90831620475.pdfIn PDF document text
    • http://www.veslovani-vsb.cz/soubory/file/bemixe.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/buluxemuwisibuwanutenewu.pdfIn PDF document text
    • http://greenworx.eu/images/uploads/files/nibatedilegifilamivozu.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/kozajow.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c9d108bce---21982407746.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/sidajobutamakawinow.pdfIn PDF document text
    • https://tebra.si/userfiles/file/ranexekavirosupimeniri.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/62155b91f46c6fd5bd09c0c2716ec9dd/80044743073.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/27143894598.pdfIn PDF document text
    • http://palmdale.thepokeluau.com/uploads/files/97922272853.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/deneraxujisudegis.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161412f0200fa7---sokinobatilo.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408c3203763---xofopalux.pdfIn PDF document text
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/28030350874.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/45387635792.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/vovozinafi.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/73514071325.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=google+chrome+free+download+for+pc+softonicPDF 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_off0000db7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7D 17904 bytes
SHA-256: 738f5a4298c62aa2da06535959988f1cd7bada34248b1dd6afcabff90c45e1b2
font_01_sfnt_off0001094f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094F 11192 bytes
SHA-256: dc94e997e8fd63cc21e0514311348d634f641d302dbce3075f5c1f8e950825e5
font_02_sfnt_off0001233c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1