Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3ec57435ae155c5…

MALICIOUS

PDF

81.8 KB Created: 2021-07-25 03:29:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 06f4c08e5c3193da38a5ba47be76b126 SHA-1: 84078707f2dbe76cb519ba4a2df70b0f1df58817 SHA-256: a3ec57435ae155c5ce55291cb9298e8a130e88e3709cf19f51c1ec44a17baeb5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, pointing to numerous URLs hosted on compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely serving as a lure for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://gps-ambroisie.com/ressource/site-image/files/kekirijabubizo.pdf In PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/0053bfd19158bdc5beed7d1b45eaec25/24338087541.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160851e952728f---33500206583.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f154e0f761---gozejorujaxovudet.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c89661acc2a---butekuleruduredukewibezow.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/30188613600.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5043b2afc---93942968245.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/xekorizajokijodazor.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/e0f0b37278b68e13a59de6499ccae9b7/golekax.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud//files/gizilesituturinoxazikune.pdfIn PDF document text
    • https://jagominum.com/contents//files/90335953601.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/kosevoxederijuriji.pdfIn PDF document text
    • https://megashina24.ru/files/files/23054147850.pdfIn PDF document text
    • http://bristolvietnam.com/upload/ck/files/tamojazemowevaxujojupepu.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/74110557111.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/vofaperuko.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/c59bnsgu61rmuh6uanvndbdou4/59922125549.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fa80cda804d---mipizinefezig.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092eb8310605---53104381283.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/39577071466.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/afaeaca71fc4c49e238c31788b1aca49/godanokufixupepi.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/2f06e635ba90dd84bdd00bf4abf671b7/tenezakixibuxa.pdfIn PDF document text
    • http://ekotronic.eu/files/file/99659835489.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/f4iph3kfpf035q7qg7rbiilvqs/maravagowavam.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/muxinaxenozizimazemil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=synonyms+and+antonyms+exercises+with+answersPDF 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_off0000dad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD0 17052 bytes
SHA-256: de04e0de0d5000e1e3544af56466769f64686414a3496e33b1a26521e5745d1f
font_01_sfnt_off000106eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EB 10968 bytes
SHA-256: 1dbaafcf4e23b1bca0b2c25724d19894fbbda2595df1aaec2d5825a745e6b5d4
font_02_sfnt_off00012046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12046 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.