Malicious PDF — malware analysis report

Static analysis result for SHA-256 df7659226ea2c0fe…

MALICIOUS

PDF

75.1 KB Created: 2021-09-20 05:35:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6e3ecb424fc7f3495266977561d78b51 SHA-1: d6a8ab8fb1df8aa11c2284b2c09d370ecc835db9 SHA-256: df7659226ea2c0fea02b555fe5f60b3220b32b033ea2b433fe6fc12d73bca7d4
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristics indicate the PDF functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The embedded URLs and the nature of the heuristics suggest an attempt to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://gotoko.com/cmsv2/upload/files/81643138037.pdf In PDF document text
    • http://mondoacquapiscine.com/userfiles/files/77722088683.pdfIn PDF document text
    • http://claudiamelchior.it/images/file/vegusamadofox.pdfIn PDF document text
    • https://digiconelectronics.com/media/vobogewafemobaxe.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139da95dd431---57107127109.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/80928721702.pdfIn PDF document text
    • http://n3ss.ro/ckfinder/userfiles/files/15341198896.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/78833307069.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161438c6915dcc---xegukezivivuwesomeluxodaw.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/90925454397.pdfIn PDF document text
    • http://riverhouse.at/pcms/content/file/11384711675.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/puvewurowikosisojed.pdfIn PDF document text
    • http://logenamerica.com/userfiles/file/wajobitiviponovutemiko.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/16003540393.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/98332165837.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210907_2331070A95DB7FD7.pdfIn PDF document text
    • https://epponline.com/mentorfinancial/page_images/file/65907776565.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613568b9d34fc---21858203448.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/zejojigelidasa.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/jisiderexuremoriwefudejo.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/76535210300.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/51371904509.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/wavipojudaxifutox.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613357de3ab6e---gusupukoro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=s21+ultra+vs+12+pro+maxPDF 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_off0000c2b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC3 16952 bytes
SHA-256: 8506d78144fcf76806a5975cf2fe420d3058f1f6585a13e4fee6460a54653182
font_02_sfnt_off000106ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AD 10600 bytes
SHA-256: 35c0b0d643ceb542624308704ae6db7c137cf8776a975d774df2b6adf91ed13c

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