Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a1e32c710f18039…

MALICIOUS

PDF

89.1 KB Created: 2021-07-14 04:04:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1d6d756fc07319e861e51e55062c91b7 SHA-1: e1089df61278bf7d80b4fe7de3927846cc247757 SHA-256: 1a1e32c710f180393dcd6198b6311aa24e8150656f3aba9b7af20e7bb0e68c56
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised websites, indicating an attempt to redirect the user to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript (T1059.007) and the nature of the links suggest a spearphishing attachment (T1566.001) used to drive traffic to compromised upload directories.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f57f9e6d09---48029966513.pdf In PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e0b1ae82e---38773205141.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa252f17c6---61968975606.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/21457654931.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/43065601535.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/56850005019.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca61747d5e---1885151332.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/29739406834.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4e9f62a74---zabomefovunidazuzogijugiw.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/88999115192.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/2a61793095df82298a8c390b8a07ee2b/nalomibegenufam.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe62a50eb4---navezududafevusu.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/81117043882.pdfIn PDF document text
    • http://dichvuhangngay.vn/uploads/image/files/nekamisik.pdfIn PDF document text
    • http://apple888.vn/luutru/files/90657712003.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/54981697846.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e9565e9ac---zefafewomupapojaso.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/859d28b188c18a13202e3427beec52c1/dovojugu.pdfIn PDF document text
    • http://cz-synergy.cz/data/file/64741714480.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/97026808191.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/13314977070.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ffb86637a---84334048582.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/472045a32c191af3de09c8d77b0d19b6/27132843864.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4b4c27b46---wogudezowekapunimibidi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=lower+cortisol+at+nightPDF 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_off0000fa26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA26 16884 bytes
SHA-256: 7f16e8d21b5c591fbda3449ae54768fc3622a46953869ded8553d91b25e7b3f1
font_01_sfnt_off000125a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A5 10552 bytes
SHA-256: f29debfdeb3dea9f6b9b03e57f7906396c651541b09efa1d13ad39520b1fb2f2
font_02_sfnt_off00013db6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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