Malicious PDF — malware analysis report

Static analysis result for SHA-256 89193977d08db954…

MALICIOUS

PDF

82.1 KB Created: 2021-09-11 10:50:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e4f20ce869181926f4ea768fb2160a6d SHA-1: e847b2def5e03acea1a6aea988a2a2d638e19cab SHA-256: 89193977d08db954dda4ec0bc89ec79ed492686406a960087b3472fabfb19548
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with numerous URLs pointing to PDF files, suggesting a phishing or malware distribution scheme. The presence of external URIs and compromised CMS upload links further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=turn+off+notifications+sounds+android PDF link annotation
    • http://sbkf.org/files/files/jozuvulonolekovixuzodo.pdfIn PDF document text
    • http://kmsenior.org/file/files/45994765231.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/gogikazepotovobixotuzo.pdfIn PDF document text
    • http://irinabailey.com/upload/files/sorifatukulebom.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613acbd93d926---kilemafit.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210906084824.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/26251485702.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/geleripezuzubivimapa.pdfIn PDF document text
    • http://artikos.pl/userfiles/file/90614696608.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/3isr06auknc1lj4q2pjmlurslu/63722870333.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613349364e8fd---xenubifepigavalanogugarap.pdfIn PDF document text
    • http://affectif.ro/data/Image/file/24315911017.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/74043094668.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/larodojuzarotalos.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/pifefelerusuromefaluka.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131b166715e2---41294485445.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/zipemojafurabo.pdfIn PDF document text
    • http://www.ambatownship.com/ckfinder/userfiles/files/59478870272.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/foxibo.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/9b8815cc4cbc7cfc5f431e31aae40e7e/31932601862.pdfIn PDF document text
    • https://dcicz.org/userfiles/file/1250737652.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/67889559381.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/xoneminukesafizalugujeni.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/xujev.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021090920261073499.pdfIn PDF document text
    • 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_off0000db9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9C 10356 bytes
SHA-256: 9afe585d2bb12c1be602ec74f2d52769acc1266d4a93b553c5410ff8fcbd9ab9
font_01_sfnt_off0000f326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF326 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B38 18176 bytes
SHA-256: 1ac386f86fee5cf36779fd8790f1eff8553109da3e4033759b39793f56647fa9

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