Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c9eaf99d28fbed5…

MALICIOUS

PDF

85.8 KB Created: 2021-09-01 07:31:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 51729ba9b617db998066166c069b62f7 SHA-1: 5e5bb59d2abadf5e13787c68fd4619af28feb77c SHA-256: 2c9eaf99d28fbed5bdc25bbc4c6cb30dda9c1ce3de6a279a4635f006452919ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' in one of the URLs indicates a potential SEO-based lure, attempting to disguise malicious links as search results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://huntic.ru/uplcv?utm_term=harry+potter+series+watch+online+with+english+subtitles PDF link annotation
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/quk64sgacvujs0h761ias7efk0/64530155644.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0c224f314---nudepozuvomatumipebofekid.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210628/file/2611196291.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/zodabomasanezonexifafivab.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa1da3830f---janigenafe.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/aeucnjt462t0sqq9sgig3fkugq/fefaziwifimo.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/komowifapi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c24797e47---49348292807.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/bda4b5be123c3d0f350497220dfaf32e/89450506749.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/149fbeaf9cd193c020ff22064d8de96c/fujufe.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/remidowexerejelubizu.pdfIn PDF document text
    • https://porterbrothersltd.com/app/webroot/uploads/77422066044.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210625033205_481128665.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/27831338394.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/gidunur.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/34774696374.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/94732759200.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608ccef8b02d7---gupijafijirowabus.pdfIn PDF document text
    • http://cjatkinson.com/userimages/9704422317.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3ab8053b3---12918184522.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608702c205cd7---29455511528.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/73632130707d99ba1462d55f0db31a4f/surisuteronavosavina.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/66521209672.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/88798814990.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/madotilifuk.pdfIn PDF document text
    • 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_off0000e766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE766 17564 bytes
SHA-256: e1bf5385de3fd719157eccaab9b5b5f97bd65eb644e2031433bd69e574b67d94
font_01_sfnt_off0001143e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1143E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C55 11084 bytes
SHA-256: 4fb38ef677914f6b2fcca880946661d8b7cda8892055d94e8a9d9044077a7d58

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