Malicious PDF — malware analysis report

Static analysis result for SHA-256 1822ab8c439db0c9…

MALICIOUS

PDF

73.0 KB Created: 2021-09-08 19:56:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: af0dcbfc83b7ef9b3ef9efefb79382ae SHA-1: 328b76b6fe481bab396d4fcaaa22ab09901df4d2 SHA-256: 1822ab8c439db0c99c9ad6624179371fa69749f2012c6d40c9d89edf0f9c9691
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads and disposable hosting, indicative of a link farm. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The document body is heavily obfuscated and appears to be metadata rather than user-readable content, suggesting the primary function is to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://jahanchart.ir/data/files/file/bowobufexij.pdf In PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/di3cc4cuoamhebcdb5fmsahucu/lujenisaxeludezogafinib.pdfIn PDF document text
    • https://meritumptt.pl/dokumenty/file/pegizezoxaneboletaxonoman.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090817330339.pdfIn PDF document text
    • http://artvideo74.ru/upfiles/files/22681215118.pdfIn PDF document text
    • https://thietbigas.net/media/files/dusepisifesufobuba.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/zoboled.pdfIn PDF document text
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/batunif.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/51661935348.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134aef4a3b95---wuzunuru.pdfIn PDF document text
    • http://papienbanana.com/user_file/file/47204329920.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16138dfea9af07---9090765265.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16137ed0cdaddf---37881360899.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/vuxaketiwabireb.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/27713813132.pdfIn PDF document text
    • https://perkunasstudio.com/uploads/files/202109021756438515.pdfIn PDF document text
    • https://sieuthigo.vn/upload/ck/files/51164513085.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/98757683131.pdfIn PDF document text
    • http://dnt-mayak.ru/content/File/wegonusogowugatuxivikizo.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/23cc85a1498a09263739032389e93092/10099994766.pdfIn PDF document text
    • http://letdentalab.com/img/files/sesemegilelix.pdfIn PDF document text
    • https://superpackeg.com/userfiles/file/zewug.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/zonuxe.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0f0f4402a---58959093873.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/sedufugomowixuravi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=preschool+chinese+tracing+worksheetsPDF 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_off0000b804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB804 10688 bytes
SHA-256: af2bec3cf0772501cc187c6272143ce8004df231ba5f46b842bc6301b15a8179
font_01_sfnt_off0000d090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD090 17704 bytes
SHA-256: c08a92606ed779848a68aed7d26364a1710b3767c50aa1ebcec5b2707a7ad306
font_02_sfnt_off0000fe77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.