Malicious PDF — malware analysis report

Static analysis result for SHA-256 20dc2eac4a5bca5a…

MALICIOUS

PDF

75.7 KB Created: 2021-09-10 19:55:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 581b4350e3d883411a1b2082f9c2239a SHA-1: d2c758272be0cfa5841328c831fabe3d6f5c0045 SHA-256: 20dc2eac4a5bca5a903a859fd2f9abe0c6e79b436ee17b5714d58953174fb3eb
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. The document functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious content. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://myepres.com/HotelEstimator/userfiles/file/42820672613.pdf In PDF document text
    • http://parcroyale.hk/userfiles/81560065004.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613747acc612a---bitolopapidulumonorutur.pdfIn PDF document text
    • http://mpu-beratung-brendle.de/userfiles/file/gokizizibamoxukoleroma.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/bd8f0d35a4204a5bdd7abb9369a3ecc9/bewodidototaxu.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-4/20210904210823487531.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/ravozazivaraleratir.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/tujuganeruxizus.pdfIn PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/tupuzegemalabugonuni.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/b17438af9ece5b35995a9d86a55975eb/44633199457.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/sewud.pdfIn PDF document text
    • https://robodom.si/files_vsebine/vusegifexerijogokovi.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/55638375443.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16134050309332---kezewodudipobek.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/wapojikerutog.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/wuviwabedefobi.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b30f032cf---kajatubekuri.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/vesuxozefovafosoga.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/49037096866.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/xopifufivawexogofeto.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/5130823164.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16136c1c31726d---70253701445.pdfIn PDF document text
    • http://sabancilojistik.com/userfiles/file/14469160969.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=spongebob+squarepants+wallpaper+for+androidPDF 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_off0000c2c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dadb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADB 11220 bytes
SHA-256: 8786f75555924420b4377678fe01b6c51523ac45c4e1cbc9376493eb48ec3c7a
font_02_sfnt_off0000f48d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48D 17328 bytes
SHA-256: 54b2cdfc8e69c5085ed62277c4e599a0c3973e549336217a9720025c87c362da

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