Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7b093409df858b3…

MALICIOUS

PDF

101.3 KB Created: 2021-06-27 14:11:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 0db02be58ffaa7a8021c3c8acb785f48 SHA-1: 00de19825a924754c135d1769bb3645872c73164 SHA-256: c7b093409df858b3c209f9386707ca4e736bca4d66c3f88a3fa8999c3821d541
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to host and link to malicious files. While no scripts were directly extracted, the overall structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://birnagarcollege.in/userfiles/file/sefigutudubexuvuwupuponi.pdf In PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/92edfa2193f8ed3ad0dfac193b1e4525/xozopagebakozewusujoziti.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a42d3e2dd70---funapu.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/6719612bea570bfd316518412fdca48d/58644493592.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2b00100e1e---nipalo.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b284e6341---49672158030.pdfIn PDF document text
    • http://apnorajasthan.net/userfiles/file/morirurogovevokibovav.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874d189410f---sosenapufokufuv.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b8dd8ffe7---kumegegumijunovobebogegot.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/59339855530.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076a31c4d165---34784883935.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/mibikawuwixotefutav.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b7511e902fd---85199800455.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/2k8ebmiufe7onkabs34skuohoe/18231914932.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/50732990251.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/81f6c5b4167eeb247bd93b13a9f0d1d1/kowuziwefobufafinujaw.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/22139114392.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/a11d88459f49d97b8c8497bed4999daa/basabegenabutuben.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210625090947.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/gfr6pio2v61445cqsitpnsasrk/ramozit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=docker+in+action+second+edition+pdf+free+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00010bf4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10BF4 27316 bytes
SHA-256: 7825474e6e05f8822c7406131d9721864101d284e089a70bdefee5a15925210e
font_00_sfnt_off0000f2ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2ED 10792 bytes
SHA-256: 728e4ece569f5282a4da1cf35082a43bc75c3a565ac6c450a2ba2fe3de62be7b
font_02_sfnt_off00013b84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15396 20416 bytes
SHA-256: a7a12f9ab86ae54b2af77b6f0993d54e49c10420f951e5ed0859de719807de12

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