Malicious PDF — malware analysis report

Static analysis result for SHA-256 3659bc976bef6086…

MALICIOUS

PDF

82.5 KB Created: 2021-09-12 13:33:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 59750cb7ab9c5d17c7b7bf1c86f4f340 SHA-1: 8788081f5ce3f687db0e25a338077ecc61e36f1c SHA-256: 3659bc976bef608645c2c82f843805dceb500d8a74f23e4f8dcf4d15098dd2e1
96 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple external URLs, with several hosted on compromised CMS platforms. The ML classifier strongly indicates malicious intent, and the structure suggests it's designed to lead users to potentially harmful sites, possibly as part of a phishing or malware distribution scheme. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 5

  • 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://xrtradingfeedback.com/cmsimages/file/poxigovome.pdf In PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161385ca72f985---sojorim.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/2uk9lipvr591o6nj9211ncsli5/83827001987.pdfIn PDF document text
    • https://onecre.com/images/content/files/58837926097.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/11281567790.pdfIn PDF document text
    • http://top-caster.com/userfiles/file/latala.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/42440833376.pdfIn PDF document text
    • https://htijsr.com/userfiles/file/mikiveratulevunuwono.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/mokuxanomojew.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/kuvasolu.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/zorot.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/9qcrouh1vhvqbfk7ev846qoa04/51821609539.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f078d7440---kononelepebemotawotozov.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/78983682444.pdfIn PDF document text
    • https://telorgabus.com/contents/files/kakadunamitarojovep.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/54526429082.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/fejofakivebunidad.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d7cd1796e---52931844114.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/13477250045.pdfIn PDF document text
    • http://zenobiacultura.it/userfiles/file///75107855231.pdfIn PDF document text
    • https://atlas-consulting.ro/fckeditor/fisiere/file/kifosokataginaxadakirij.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/20804031572.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f0a324c29---85492830897.pdfIn PDF document text
    • https://yellowstonewildlife.com/26929009319.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=fallout+shelter+pc+modsPDF 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_off0000dd89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD89 10660 bytes
SHA-256: ad0911e205702a8d485b03a084bfe2fa6f4ffbc4af4a07335d9273af8a69e202
font_01_sfnt_off0000f607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF607 17864 bytes
SHA-256: 3438c04c1ad8c7b81f319e30db344e07190f2cf1c30a1648ffa16a1bca561cfc
font_02_sfnt_off00012456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12456 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1