Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aaf6c6eb285aaef…

MALICIOUS

PDF

86.9 KB Created: 2021-07-17 02:31:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dfe992a47ab94190ec5e41a6866e5d81 SHA-1: 9d058e56be672705c74db87fe93ebd82e7f8f013 SHA-256: 2aaf6c6eb285aaef3401b82c564131af50bb2033647a6cf30d3930529312c581
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains exploit code. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, while numerous, do not provide specific content, reinforcing the interpretation of a lure document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://breakevenpoint.pl/uploads/editor/file/34008225850.pdf In PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e88c0091a---94022397383.pdfIn PDF document text
    • http://okwecare.com/usr/userfiles/files/78086798110.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a835fdbbee9---79751567881.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6f5bbe84c---28936717669.pdfIn PDF document text
    • http://skomi.ru/img/files/file/68739953722.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/zatiba.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/b1e7fb9533a22864aebbafde11e70a9c/60563299208.pdfIn PDF document text
    • http://imi.vc/upload/files/giwonivipokosarajugenolo.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/bc08e864027116eaa08b60488abb527d/zonuzomoz.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/65741902687.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/c0da1b3fe9b97b564096f69f09238e95/58034775213.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f3b790cd1---lonuduw.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/94714992126.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/51235920376.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9ec8b80f2---duzoxujajogavelun.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/6453627037.pdfIn PDF document text
    • https://kermanrooz.com/img/files/lawirabogafa.pdfIn PDF document text
    • https://ebooksweb.net/files/file/dowedegoki.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/luzusaxubariwagufodudug.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/wakuzipovabike.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160e18770d9848---nabakudikiwov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=birds+for+sale+in+kyPDF 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_off0000f06e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10885 10508 bytes
SHA-256: 4b241dab554e33fe89050a37b6502e7e65d1d6e483c4f862c81b9174d27bd13b
font_02_sfnt_off00012089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12089 17140 bytes
SHA-256: cf31ba9d4f7a08308cd9e008ca006abb6a0a4eddfe5de142be92413b23eb68b6

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