Malicious PDF — malware analysis report

Static analysis result for SHA-256 a88dedab7cf0def7…

MALICIOUS

PDF

79.7 KB Created: 2021-09-19 08:51:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 454b7aeace37b0308dcc3593915c41f3 SHA-1: 7b5212b7677c84697f5185c32c4e04248937616a SHA-256: a88dedab7cf0def7b245b32299c74eccbbb3193f5fe2c7d688bc53f28148592b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting a phishing or malware distribution attempt. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. While no scripts were directly extracted, the presence of external links and the ML classifier's high confidence score support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://spirit-legend-enterprises.com/webroot/editor-uploads/files/lunagojipobenejovefaziv.pdf In PDF document text
    • http://bedrucken24.de/userfiles/file/kilupumasanugukikopon.pdfIn PDF document text
    • https://nepalihemp.com/ckfinder/userfiles/files/95690487130.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/dojexirovov.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/dajugupupafujepalar.pdfIn PDF document text
    • http://pasted-radio.de/web/files/69446664479.pdfIn PDF document text
    • https://sananselmo.com/wysiwygfiles/file/49984681586.pdfIn PDF document text
    • http://intertravel.hu/_user/file/47862231774.pdfIn PDF document text
    • https://thietbivesinhsonhoa.com/webroot/img/files/dipikuzinifojusozaj.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/sodotozositiweneku.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/bijuvagukiviresafufelovuk.pdfIn PDF document text
    • http://fukaofoods.tw/uploads/files/202109022010098203.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133d47ebb817---zutiwopogususuk.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16137e22290f3e---16348369310.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1631771354.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/161417d37416db---ripazani.pdfIn PDF document text
    • http://akcihlar.cz/userfiles/file/mifetuw.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/mapuwexumeromuf.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386354ce2cc---18515708629.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/jopogelojubo.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/vemavixugef.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c91a715315---zawivomobezaneje.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/86076318758.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613255f0c1c8a---riwaxuzotofo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=speakout+2nd+edition+elementary+student%27s+book+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_off0000c8ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE100 20444 bytes
SHA-256: c2c042dd093d6c32e6da53af49a4310b796fb527065a8907a2647c245d7a5a95
font_02_sfnt_off000114b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B8 11336 bytes
SHA-256: 701200929d809e2c1542a6a1d3d5848d7a9ba86ec23c6d8d7760badc3b3578c6

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