Malicious PDF — malware analysis report

Static analysis result for SHA-256 a55727ffb1eeddbc…

MALICIOUS

PDF

88.4 KB Created: 2021-07-05 00:20:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a7232bdb8322a51a9c2b5a92cc4f99f7 SHA-1: 4fbd9c59fbe8ef17f4bcd202492102d9360cc393 SHA-256: a55727ffb1eeddbc89eb64879beaeb72f9148d8daebbb75d94d87e718a0a39ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous embedded URLs that point to compromised WordPress sites, suggesting it's part of a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to lure users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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://cructi.ru/uplcv?utm_term=drawing+sketch+of+girl PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e853c0731---mixarufuzakinawofomum.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a84a3b4bc9f---60555607388.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160da1cc4733b5---kikamogegedira.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/aojr56uqg09kbjfgbi8k6tgac7/75434244953.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/57258251937.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/mtoaddpbu2tgj0duieqq6imif9/62412731051.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6028868f6---fakokevagabefebexuguga.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f02f9f6b8---45888326824.pdfIn PDF document text
    • http://fotossc.pl/_files/file/30322006400.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cbf29a514c---difaju.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/bctd0kl0pg84rck0gquu8bh39l/62678381273.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/10220743947.pdfIn PDF document text
    • http://cosmic-kino.ru/sadm_files/kimagagawafubevuw.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/79110942601.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/dafeponizojuza.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079105666c8c---72174381819.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210523010548.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/01cdffc0e3d0c4f3898d280599f189ef/xubazetidimid.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/655942c9c40f680d23f722d8247355da/goxozumet.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/godarirokalap.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/shnt88t1m7uuqkg9bu17gi2ab1/zifetob.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/ba488dcefd28303ba900674d3a5cf1c3/93441990763.pdfIn PDF document text
    • https://kham.vn/userfiles/file/jekinuba.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/6e59cd3fc16ef91a90ece7abaca52da2/megemuwemirezo.pdfIn PDF document text
    • https://scheidungsrecht-best.de/userfiles/file/61292226159.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_off0000f499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF499 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010cab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAB 17336 bytes
SHA-256: 62993fe2850db83f9385ef2e88ab94a540af39cfefef28d0fe5c56842aae23c3
font_02_sfnt_off000139fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139FB 10796 bytes
SHA-256: af25114ec4a7dd0a7768394af879eea077bdd29c175b7331921a3c31241c2ddc