Malicious PDF — malware analysis report

Static analysis result for SHA-256 313d3a03dc862c17…

MALICIOUS

PDF

79.5 KB Created: 2021-08-31 05:23:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8f53e5ec7a874b629d02f3c5a168cc8c SHA-1: 326dcbb2a925dca1c404391567447c9c6118f5c0 SHA-256: 313d3a03dc862c17fa73d1f10f85b5e5e61fe25ccd584347e731fcd121da605e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. The embedded URLs suggest the document's primary purpose is to redirect users to external, potentially malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://drafthe.ru/uplcv?utm_term=how+do+you+say+bill+in+spanish PDF link annotation
    • https://interior-mark.com/ckfinder/userfiles/files/vovekajebuvobelog.pdfIn PDF document text
    • https://aalatour.com/basefile/b2caalatourcom/files/bowojetu.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/sudimaponifixikuwe.pdfIn PDF document text
    • https://mimpishio1bet.com/contents//files/24924662599.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/64802304202.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/misul.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16070e65a57f78---wipuzag.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611b4d3f30a34---95826879496.pdfIn PDF document text
    • http://7linc.com/uploadfiles/fckeditor/20210829/file/16301902397665.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/15015095864.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/1d8bbcf235988816acc290765d1e3fbc/15196735101.pdfIn PDF document text
    • http://doublehaircenter.com/upload/ckfinder/files/riganuw.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/fuc2umj4tp8both6rikdb6moei/49217257508.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16076df2804ac9---gevimavob.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/60a7749b1571ab9b9e45ce5524531800/91743757427.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607436efc37af---95802463136.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/matinokozamupoxuv.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/35525782532.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/4831067022.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/53875324926.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///fasegenutamunidizudunemi.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608827baaaa0f---36415014330.pdfIn PDF document text
    • http://marketingnews.fr/images/file/6122245952.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/85200629024.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_off0000d1bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BC 17716 bytes
SHA-256: 0c69347ae9f2da67ddb316ab21414f58925887e3e324b1f6aa018cdc3ac7909d
font_01_sfnt_off0000ff59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF59 10592 bytes
SHA-256: aa8789360af0aecc83886453a5d17458819fb2dc353651a352c41b1738d1ba47
font_02_sfnt_off00011728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11728 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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