Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8ddc9f68a99ec05…

MALICIOUS

PDF

76.0 KB Created: 2021-09-03 14:24:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 748db735eff2577f9dd9ce15cb35f837 SHA-1: 27f87f38473758bf3bd254f3520fc86debad3c4e SHA-256: a8ddc9f68a99ec05bc49a7eb0fb82471f39270979e71c97e4ab70eeb078b99eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate that the document is designed to redirect users to potentially malicious external content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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=dermatite+atopica+em+caes+pdf PDF link annotation
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130505a50c38---nevuna.pdfIn PDF document text
    • https://actor-conseil.com/files/file/89804735890.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16081bb12688b5---45372926203.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/4cc64ec4d07bc0c17d0ba0ac5112fc2b/82266413990.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/34790317040.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/47041168335.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/talibirolamimuruwonobuw.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/73029681017.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/mivobezoxinamipofopidexu.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160821883a7fa2---puxaduke.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/a5bcbda9dc6c18730bff0a5406e1f1cd/duvutidufatepa.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b3c020143---50327503520.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/14720052292.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/kobagubinudomepajidil.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a49b5301f0e---83639794443.pdfIn PDF document text
    • http://matras-devison.ru/upload/file/65679472471.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609444610ae6e---xuwezadeso.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/17448227344.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bffd01505ba---86850328793.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612979403c4e1---jemigesuno.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/logozuvivowamix.pdfIn PDF document text
    • https://avayemehr-carpet.ir/data/file/14046252793.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9e71abb67---muzutixelometatafir.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/ljbffp13ojhdmiqfudheo3tamo/82214024521.pdfIn PDF document text
    • http://passaicvalleyclassof1957.com/clients/44362/File/49388164069.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/parujos.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_off0000c680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC680 10632 bytes
SHA-256: a3c63d430280dadf14be182eba571d5a92af3ae11456f922713639afd3f0c489
font_01_sfnt_off0000ded8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED8 16992 bytes
SHA-256: 7ab4eed82e62d7d4f54b9a069779bf3024ec1e49be132addf12e8b4217f5d43a
font_02_sfnt_off00010a56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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