Malicious PDF — malware analysis report

Static analysis result for SHA-256 66ea63a0fc023b8d…

MALICIOUS

PDF

81.0 KB Created: 2021-09-17 11:30:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f2708724df9d9d2697ce9197f821a8d4 SHA-1: 38a14cc9e3f51bedbf48a74bb49e48e640f459ad SHA-256: 66ea63a0fc023b8d24725162e613c6b2950a82b27a2ee55c6ac5defbbfb6a006
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://synerhu.ru/uplcv?utm_term=unterschiedliche+benachrichtigungst%C3%B6ne+android PDF link annotation
    • https://mamadona.ru/ckfinder/userfiles/files/15563353296.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da2ed8324c---xojasomata.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/kuvuzapivafopojipumenevaz.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/92479050970.pdfIn PDF document text
    • http://thcsnguyenvanhuyen.hoaiduc.edu.vn/ckfinder/userfiles/files/69724113003.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/bulofiwojopenalif.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16132914044549---fumibisonimekatajuwaruw.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/visuguxoguduxabineti.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/pexezune.pdfIn PDF document text
    • https://smartcrm.cloud/upload/files/10141113803.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/59304430683.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/85466623147.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40560895775.pdfIn PDF document text
    • https://maturana.cl/upload/file/82880318530.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/mitenev.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/e7f0c51f405484145a5786e3392b75aa/wovezevetexuzipiki.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/38931849376.pdfIn PDF document text
    • http://unibeauty.com.br/ckfinder/userfiles/files/7536854017.pdfIn PDF document text
    • http://cudicio.it/images/file/79633358403.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613cdef6a248c---50153616760.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/001eaf1ce67a40300fe7cc47ac22ddf5/53604075766.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///23733083126.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/tilotu.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/95375522044.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_off0000d1cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1CF 11108 bytes
SHA-256: 76a259750cdd69cf14e6a4ac9cc3515289ec46e885b01035d614a6f206d2e8a5
font_01_sfnt_off0000eb15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10327 19536 bytes
SHA-256: a07c95923581e1459162db7cec1e8d1fc7290ce2965e9bb280c4958add584552

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