Malicious PDF — malware analysis report

Static analysis result for SHA-256 015fa55fe818d6af…

MALICIOUS

PDF

78.9 KB Created: 2021-09-19 07:13:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: b0b7dc393aa380d45d068e6bcd1134d3 SHA-1: cb7334dc33ada50daa2880c3a54802f487353349 SHA-256: 015fa55fe818d6afc4dc114f3f7b6f0d944cc07666e03dfc4ba79ac7efe312ef
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://inwebjor.ru/uplcv?utm_term=cara+memasang+emulator+android+di+laptop PDF link annotation
    • https://dafelia.com/files/fopevamop.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/50345643099.pdfIn PDF document text
    • http://octapus.vn/images/uploads/files/34014576263.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/41397147256.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/mabesemex.pdfIn PDF document text
    • http://lynxauto.ru/userfiles/file/vopexubamajololakada.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/41190366508.pdfIn PDF document text
    • http://deleeuwputten.nl/site/data/ws/files/94313559267.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/kevitebivuxawe.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/5elfueuf2h7cvrh4jb4jnol846/rudupawomar.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/98787038560.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/39115305047.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/laladobudegabusavaliwox.pdfIn PDF document text
    • http://ehomerealestate.org/images/file/rixunepi.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/38033568670.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/ruzupedimukepozafurekugir.pdfIn PDF document text
    • https://discovercefalu.it/_data/images/file/wafizimuwuzusibusapatawe.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/80536771000.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/dimezemitosexejepitatopaw.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/c38371e46484baf25466b5ccfd0521eb/4439166107.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///zatojenirotedusamokuzob.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613caae341893---tazimekiwozosedesisedud.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_off0000cfcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E1 17496 bytes
SHA-256: 100c0c37dd517ea5c5a91de94257c156055d0dd59c28d48de6463d2433975d43
font_02_sfnt_off00011539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11539 10864 bytes
SHA-256: 06becd28030a0b269271c443adbb4c5936c6211346593491fff84ed69c71aaca