Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd4a9079b318bbb8…

MALICIOUS

PDF

79.9 KB Created: 2021-09-03 19:57:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b9fccdedeba414319e2f0267299e76b3 SHA-1: a891416dfc3895eca43622c21ed18938710f7e4d SHA-256: fd4a9079b318bbb80f0eac89519e5ada07703068c1127bf283f5730ca21ba420
156 Risk Score

Malware Insights

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

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous links, many pointing to compromised CMS upload directories, suggesting it functions as a link farm. These links likely lead to phishing sites or further malware downloads, aligning with a phishing and malicious link distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/f3807f4e64cb382b07eea17344e609a5/lujaninojibigexenazo.pdf In PDF document text
    • http://immobilieninvestors.com/userfiles/file/18766530116.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/67677617325.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/ragimovudok.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161082486034d3---81961623558.pdfIn PDF document text
    • http://airmon.hu/images/files/wikuvik.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/49467705927.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a173ca5dc40---87848992869.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/76270058139.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/73082119888.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/48786771580.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/68772344885.pdfIn PDF document text
    • http://designgaleria.hu/userfiles/file/67525792984.pdfIn PDF document text
    • http://oaklandscreche.ie/userfiles/files/wovefezugagovo.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/kaxezezuvogivu.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/19441583308.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210728124822_6rlcin.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/tp5an79bik1rs9n14s0drg23mg/42272456459.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/liloweraloti.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/9621d09f2218c7159064839736cb7396/laled.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/c1c2209d67ec56ebb19fcf1f4cdeb1b2/miburetogafi.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/57853923641.pdfIn PDF document text
    • http://ehs1958.org/clients/73155/File/94954308213.pdfIn PDF document text
    • http://chicopharm.com/upload/files/57165367973.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+delete+text+from+pdf+using+acrobat+proPDF 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_off0000d23d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD23D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA54 11384 bytes
SHA-256: 77d5fa9657c18dbbe45ec6d296f8ef3d784486634c3fc9d1e817b6a39a4c5a0d
font_02_sfnt_off000104bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BC 17432 bytes
SHA-256: 3efc78e16d1f1490c21e83e9c1706647d8f5125e4470ef98cdb34f09f234ebd4

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