Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d8205e1fc205043…

MALICIOUS

PDF

88.8 KB Created: 2021-06-26 14:59:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 151dd1ed85bf281ccc6fd3b97e06dd99 SHA-1: 82c0f6b3f030c3b90c8f6be9296f2060f94b3ca7 SHA-256: 7d8205e1fc2050431adc4e88e47d9bf41ac550927c2a7446e4c3f05329defff1
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://vksraja.in/fckeditor/upload/file/danasoxoxeson.pdf In PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/aa72f9b8586341b4a762e9dc2bd2eef7/meweteserigajavi.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1609473dc44071---fipaxoditemizagu.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/wagejivi.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/vegigapimububukujijosek.pdfIn PDF document text
    • http://jucal.es/images/file/litarasopat.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/marafetabigitegej.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/oi3mcjaa71b7fe814adshnosam/poxuse.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/zuzomifike.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac84bd96605---gijanowepaveg.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/didapekonipuwugom.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/wilekojijagulutuvakep.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16098b578b8933---28121080957.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/55290872891.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160845bf52da59---zunojademiliwil.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/90877122090.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/ce6010cb013a6a116fde32a18b83207a/xukexusagerivijoranume.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815f25c2217---99274360274.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095231a474f2---nanetetiximegumo.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8e723277d---49787609397.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160accb409497f---16377008966.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=squiggly+things+in+visionPDF 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_off0000f9cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CD 10492 bytes
SHA-256: 5f5d953eecc4b1f48de09d3695647d6582a23ac3785ee58a31bddf0096af01fd
font_01_sfnt_off0001114c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1114C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001295e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1295E 17216 bytes
SHA-256: 5dc0985da866cef690aa05d4fe790bc2b2a373f70ed5696694e49805b23ffc7f

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