Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc81217a45997ef7…

MALICIOUS

PDF

79.8 KB Created: 2021-06-29 11:46:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c3c8f79dd21fbc9dc037df5b5f0af5f9 SHA-1: 735f727710228382aedbf6357b0aadf6ca3b3e32 SHA-256: bc81217a45997ef721c020a1ee2c10aaf661c2ddf20a5e1bb3e06cdf9bb6c550
196 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a phishing lure. It contains numerous links to external PDFs hosted on compromised WordPress sites, suggesting an attempt to direct users to download further malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs users to open a password-protected archive, a common tactic to bypass security gateways.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160995ee007c37---mesape.pdf In PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f19cdee9c3---vazupedijuw.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3e437a3e2---97578962000.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/lozozagixewegemexuxes.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/e69c99964f4c653811123a9804c873a6/vajepirogog.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/l4olr1pfcer4okq6ti5l11bg2u/gulerul.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/kokitelamitipajukusibifig.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/b444cf525459f5669374e4024497aaeb/rexizozozogesebatip.pdfIn PDF document text
    • http://zonweringbelgie.com/ckfinder/userfiles/files/86909258395.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/fikad.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160754930ba1ad---pinobenebive.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/e763f68b4f5d3601783593cd9320a891/48786366075.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be05454456a---2254023724.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/439c044055a2809bc794113d2c9125d4/xuvodi.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4ca85b336---33996236012.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/momokovoniruvoxolipez.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9255ce8a3---sewejivenubi.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/84759790477.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/7ejcu9rl3efaav7pb3mfogjua5/12517088262.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/ae6sbpeofp3l1cj3ifu06gqf8d/zajevefawozutivowiz.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/dc4c5d79eb83d0dc3ece9277e76616e4/88009218071.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-6-10/20210610124219468631.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/72815712364.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8ad2e7b18---meliputoritanadino.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/kesolubovep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=reduce+pdf+size+online+for+freePDF 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_off0000d4c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C7 10560 bytes
SHA-256: c98ca25dc323f691e728dc21b645d69aef2fb9c52b92ce85456279967367b40a
font_01_sfnt_off0000ecf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF0 17204 bytes
SHA-256: d325f5919de0a360cf7720e43ce3edd555a8d2c05d478c33bfea1d57c03d0858
font_02_sfnt_off00011a11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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