Malicious PDF — malware analysis report

Static analysis result for SHA-256 35005e5da8c90c0a…

MALICIOUS

PDF

100.5 KB Created: 2021-07-01 23:45:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7bbec485c3568eb0799c85080069e67f SHA-1: 6aed07d811c3531ac5fdaf918c21cb526a1539bf SHA-256: 35005e5da8c90c0a4c757109139b4430640514696c37789283968a71693711f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting it functions as a link farm for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9803

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://chcial.ru/uplcv?utm_term=macbeth+synopsis+by+act
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087f72229538---92449044270.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b1411979f4a---52425257259.pdf
    • https://cicadit.ro/UserFiles/file/ratuzu.pdf
    • http://porpora.info/imagenes/imagenes_contenidos///bujupuxonumefopola.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160791635ea0e5---87010898822.pdf
    • https://electrabicycles.pl/app/webroot/uploads/file/16207930714161.pdf
    • http://www.alexgis.com/siteuploads/editorimg/file/kugulobafasu.pdf
    • http://mfcwestenkwartier.nl/beta/userfiles/file/ximemotibovubumapon.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a1408165e---76750557385.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4ce5999e7---daratopuvutedipeladig.pdf
    • https://karapinarinsaat.net/userfiles/upload/file/supagewo.pdf
    • http://mitsubishilongbien.vn/images/ckeditor/files/nilujamamir.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e05cf1bb98---tejawuwarejufaporekusovip.pdf
    • http://vinmexindia.com/uploads/tatakovazitowexafabexaru.pdf
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/gifode.pdf
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/68237ce6d49fde410f1a81d89d79b66a/63516952121.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086cb5edf153---94239219002.pdf
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b29fe552dcf---raxaneruwawagagivute.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ffe332b5e---masetuzojofukuperim.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f173a95ff---dizokalawinixisupewabena.pdf
    • http://aexpress.lv/index/images/up/file/79049322927.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aeb36bbe8d---84431313314.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/euq665uvr9sbm0upl4dkqan3r9/pedebefotutanez.pdf
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8e126c52e---xuxamofanoman.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/l9ce01vqfq3qe5o21gl6rtqao0/71095882679.pdf
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/10fa93c702ce343880f18833c4864363/mudazawarexu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000123ee.bin
cbe263ccd37df7add22f9aea0d24bfe45be4f3dced8f427c36c0a7f37617504b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123EE 10572 bytes
font_01_sfnt_off00013bdf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13BDF 16792 bytes
font_02_sfnt_off000153f1.bin
df383796d40a1b1f815b691aa5fdc27f4eabefe1d9020e307e881b3d26862b0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x153F1 18680 bytes

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