Malicious PDF — malware analysis report

Static analysis result for SHA-256 f504c19f54735139…

MALICIOUS

PDF

74.1 KB Created: 2021-08-29 04:35:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: d6408d18b85613da09ebaca93ea1fd10 SHA-1: 0a8eb49085297e64949d657e88cebd010439bfc9 SHA-256: f504c19f5473513905a2ee55df0259d4681ee8855f753142d085f122afa03c61
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous domains, many of which are hosted on disposable infrastructure or compromised CMS uploads, suggesting an attempt to obscure the ultimate destination and evade detection. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or redirection attack, likely intended to lead the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://aquamedicasatumare.ro/ckfinder/userfiles/files/32896411731.pdf In PDF document text
    • http://shimamura-mail-order.com/userfiles/file/80428566356.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/xeminugonox.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/wenudirizo.pdfIn PDF document text
    • http://musik-fachberatung-neumarkt.de/images/uploadedimages/file/tilinatosilanujar.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/555742fd02cea3ea834b68728fdb5614/kipefejilup.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/gizodititiwe.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d511f4ebade---jedabibonefofumure.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/sokanexuxilomuxomegaloxog.pdfIn PDF document text
    • http://mrukseo.pl/userfiles/file/lubiwarigevibujiwo.pdfIn PDF document text
    • http://njf724.com/basefile/janatalnajafcom/files/67702260932.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/badit.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1622132126.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/72192112637.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/dirimefisowanexeva.pdfIn PDF document text
    • http://jaluzipro.ru/public/userfiles/file/31224707018.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb93a9e5a3---xepunowazetivuxetudowonen.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe34d50f58---goluweradizerilisa.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/kikabim.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/3cbd77de658c3de9209d7468555f3ada/34238287302.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/vamojunisunejeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=sql+with+clause+examplePDF 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_off0000bda2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDA2 10824 bytes
SHA-256: 7fd4b8f75788a304289ef4e909ed45d31303c68f65c77f9bdcdb9913a0df012d
font_01_sfnt_off0000d6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B0 17024 bytes
SHA-256: 843939e41a789ec836e2e6794175a78a2d585d68428a005c5d849ecac3266d24
font_02_sfnt_off00010296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10296 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1