Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c46a35e61025e07…

MALICIOUS

PDF

91.1 KB Created: 2021-07-28 02:07:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: a75c98e8f3466372367747488b8d4082 SHA-1: 04022f35fd6fa17a9edcd9eb5f535b8033b72171 SHA-256: 4c46a35e61025e0742c3ffce92f8d51565f3a4c7a74d43324d03c6d68782b2cf
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on CMS upload directories that appear compromised. The primary goal is to lure users to these external sites, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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 http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a22d2018789---jonurar.pdf In PDF document text
    • http://nextgt.eu/uploads/file/merimix.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/98361055754.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/4a249f7385be7d562c6aac85c61c8c8b/paxugoroniruxurabu.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077083dc8c08---53278381464.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/nodab.pdfIn PDF document text
    • https://lasanisports.com/files/jemadozogusoper.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/22514488325.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/4a395493205887ef43b1db38927567a2/witat.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/c98e769ebea6f7ca89c807d56b864c8e/rojesebe.pdfIn PDF document text
    • http://homeopathyhk.com/files/93818662465.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/vogesa.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/tegobevixerakugujobinizod.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed6871024d2---34794245093.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210611143742571632umyggj.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160765f303edd4---jarukevepuvogebunukis.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6f8a3db22---gitediramevegi.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/90c4a396cc34da821dd385347ce1fc08/67708868163.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/44206819243.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160833b9eb4fb1---43302835847.pdfIn PDF document text
    • http://suseefinance.com/userfiles/file/62849145867.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/kipabigexitudupamakekez.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607243a64c164---66758784172.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f271a1de7ff---wowotol.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/domefedawuvikuxutozizaku.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/f7f4938ef08f3f57a159b1c78782a252/guretawekoxaziviri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+many+times+did+luke+and+leia+kissPDF 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_off0001029a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029A 16856 bytes
SHA-256: 60a576c79789a6d3ab6c01747f9213f1493c30d7ece594dd4cc937fe61dce5b5
font_01_sfnt_off00012de4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE4 10692 bytes
SHA-256: 7ddafcb56e0b0ef4a11778d3ae71455a4d3e952bb20e3549f6b0873d406c6d98
font_02_sfnt_off00014670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14670 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1