Malicious PDF — malware analysis report

Static analysis result for SHA-256 5941a4a18a8bb46b…

MALICIOUS

PDF

100.4 KB Created: 2021-06-29 17:04:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5c8952340fad889499a92fd6475a982a SHA-1: d7a73d55ae9f9cba1229b2790687cd948da3c692 SHA-256: 5941a4a18a8bb46b4782783b49397402a8abc321af3d13418d2586f3c9deb1b1
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised websites and disposable hosting. The primary purpose appears to be directing users to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://intervalhousehamilton.org/ckfinder/userfiles/files/2420708247.pdf In PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728ee382b39---48585879572.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/11bb6131acba9433c42b6eadd2840965/49208624989.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16075d9fc11b04---19700936730.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081bab4557fc---tolubifuv.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/d585656f5c57e78ec63e5a68ce2a93c0/76789618673.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/mlk052nrl2i9dc6244h6gd0874/nufebe.pdfIn PDF document text
    • http://www.nomorcantikspesial.com/file/47783314703.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/novmha5402bk9q0e38of67rvvf/26603176891.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/53285122552.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/wolurupekabafusojoze.pdfIn PDF document text
    • http://fxmeat.com/upload/file/b108df3673163783d58c181a20191a63.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/rivepateromiz.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/72208406146.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/13605351324.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160764b768c279---kifiwa.pdfIn PDF document text
    • https://cahayaapi1.com/contents//files/98751718555.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca51c8dc21---62945971154.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b66b588104bbad4580f86b8923029a93/60400799084.pdfIn PDF document text
    • http://eaeocs.com/clients/c/c7/c75ed17bfa54634cfc1039f1b599a7e7/File/64087869997.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16086bac7147ca---zezufofotibim.pdfIn PDF document text
    • http://93564497.com/userfiles/jijagisotazuxavujutiwir.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa8898c013---83924259115.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609dcb1c63d02---34642726578.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/14unctajlnfs079bct40mrol1ilbu3i5/zipemegomuxusonadaxeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=animal+crossing+new+leaf+nds+romPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11079 10788 bytes
SHA-256: 6bd4236258d7fab2d809e8edf02df28a6165a3a4ea2eca18af2f10d33149ec3a
font_01_sfnt_off00012929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12929 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14136 5320 bytes
SHA-256: 7b42ed69b05ea389afe7dba7d112053f2d72ca0c56650dfcb9fe70dabc07052a
font_03_sfnt_off000154ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154FF 18124 bytes
SHA-256: 8f9ae632d9cf41d6670b0b3c262543723cf94c3cf7e3c7a18e4625c994b4c321