Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc54aa342432ad97…

MALICIOUS

PDF

84.8 KB Created: 2021-09-09 02:57:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 373008352e0d76fcd2fdb9acf2c490af SHA-1: af73fd0c03bef84cddc63c68159be7abfb9385f1 SHA-256: dc54aa342432ad97d1764f049d15d190c4188aa88c64fcabf8fdeb1ccb70078a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains multiple external URIs, including one pointing to a compromised WordPress upload directory, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of a 'download button' lure further supports a phishing or scam-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nomylo.ru/uplcv?utm_term=cold+war+zombies+mod+menu+pc+download PDF link annotation
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613283f238b70---27479712030.pdfIn PDF document text
    • https://phukienbep.net/media/files/86356766054.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210904_CA18BA03051B34E7.pdfIn PDF document text
    • http://coaching-scolaire.net/userfiles/file/56456311191.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/56504911150.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/32692337433.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/fikuxixo.pdfIn PDF document text
    • http://hoangminhphatkorea.com/webroot/img/files/bumunixepukolokopu.pdfIn PDF document text
    • http://rockbond-aac.com/id-admin/fckImages/file/6703405994.pdfIn PDF document text
    • http://sandlnae.com/data/editor/file/46368622552.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/72627750595.pdfIn PDF document text
    • http://liderzy.natura2000.pl/imgturysta/files/rumerutanudipuriwawow.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/59dc7883feed0ae12e0c11ef314b6883/23836475366.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/47572560745.pdfIn PDF document text
    • http://swissies.lt/ckfinder/userfiles/files/vizemader.pdfIn PDF document text
    • https://vinasimex.com/uploads/file/tedoxe.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/tovibalu.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210903175359.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/tabatirirorosujadapanojom.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/misekar.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613848626cac5---48070980016.pdfIn PDF document text
    • http://studiotecnicodama.it/userfiles/files/dizowisomoki.pdfIn PDF document text
    • http://pandoraecza.com/genelresimler/file/resujexetibenaf.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_off0000e499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE499 18428 bytes
SHA-256: 99df7532531af5b82c7a1858ef579ccd5c309ebd6323ead9e690299fe353e487
font_01_sfnt_off00011479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11479 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C90 10992 bytes
SHA-256: b9ac611969c61344aac29f641ee8fef6ecc6c2e9c9ec82929408b39e9fffd11b

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