Malicious PDF — malware analysis report

Static analysis result for SHA-256 e33e28bd878e9aa7…

MALICIOUS

PDF

76.4 KB Created: 2021-08-27 23:06:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: c87e496cb530a569facf9275e88097dc SHA-1: 694c2383e8934eb671c4c2bfce8a5b93d843b0c2 SHA-256: e33e28bd878e9aa7192f9dca361e10b6a538b58421396db3a42dfbcff7197ede
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The document contains numerous URLs pointing to disposable hosting and compromised CMS upload directories, suggesting it's part of a link farm designed to distribute malicious content. The presence of embedded URLs and the 'Fake invoice / payment lure' heuristic indicate a phishing attempt to trick users into downloading further malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://xylemleads.com/userfiles/file/vuvolidororenu.pdf In PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/6cd02d605d648eb391686fbfeddbd1a5/nuxewewinipefasese.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16121672032ea1---biwumitesubumonepanubefi.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d810693dc---23155762939.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160d61d40da2fc---dufap.pdfIn PDF document text
    • http://vodnik48.ru/content/file/2479559543.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7bc621b1b8---65131461257.pdfIn PDF document text
    • http://kistours.hu/userfiles/file/fagomibilufoguv.pdfIn PDF document text
    • https://luminex.pl/upload/file/papewopuvadonenuz.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/suzorifuvukopulazuguj.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/xixolunap.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/5590fe6d55e3eb387ee6187eb1a4fe2a/37276449734.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee44546ef6a---459641228.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/92b7b93215a5ac573521b7b3c282b1dc/vukafadiziwexuzujanes.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723d9b79e4d---77891319766.pdfIn PDF document text
    • https://zhongzing.com/uploads/files/202108141930115736.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/20m7olhbbc282fu8n9s8ne43fl/78342330488.pdfIn PDF document text
    • http://carriewoodfamily.com/clients/5/5b/5b9f2fb360c4065436fb7fe1267c3612/File/88294951242.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/wewobito.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/fhtg9dffk6eovonuruae5a1b6d/sagorujawo.pdfIn PDF document text
    • https://matteagianotti.ch/userfiles/files/bixudesam.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16121bce3e6c87---wupigafekunevivigomutosu.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/5bd6d88870b5616e81d21a30104886cd/36104881145.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/molawoxasodobugaketa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=concepts+in+enterprise+resource+planning+4th+edition+solutions+pdfPDF 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_off0000c6d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D5 16428 bytes
SHA-256: 03da486cf456f2713599d5d9fbe26800e1b535d46f93f31341c3847da0bfb2f3
font_01_sfnt_off0000f154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF154 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001096b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096B 11108 bytes
SHA-256: 0224dd5d93d215a3cb07549adfc1d35cff1b831235606f0c9c0abbacbdd135b4

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