Malicious PDF — malware analysis report

Static analysis result for SHA-256 41e68e575923b7a4…

MALICIOUS

PDF

103.0 KB Created: 2021-06-27 21:17:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a37dd1af47544b3445275cb16f214033 SHA-1: 5e63d09d93a870bcc422b29158f670926d007ec5 SHA-256: 41e68e575923b7a4e205fdddb97e04880f889c5f86e79fad057b8c477f8cf612
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of multiple external URIs and compromised CMS upload links indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9657

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://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607a7062d23aa---61388330715.pdf
    • http://thebrownsfamilyreunion2008.com/clients/81208/File/81271975825.pdf
    • http://portalkucharski.pl/app/webroot/media/files/lexogafepitufe.pdf
    • http://c2ctrading.org/cms_upload/files/nuravesoxesapipigupej.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c90f9c965c---6660088067.pdf
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/wojuxi.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3065d4525---24600125318.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b346461c634---lodabiz.pdf
    • https://educhina.mn/editor/files/39927366827.pdf
    • http://kmkonsult.cz/userfiles/file/titizirudoti.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c32a3332ff4---77650918491.pdf
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/f4960572591bd9082900595facb7a2b1/42965684470.pdf
    • http://crackershrimp.com/file_media/file_image/file/79672512089.pdf
    • https://promise-land.com/upload/file/36432902293.pdf
    • http://aweibel.com/Photo/file/misexepukilezezamawozon.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b46ec87c21a---55253136548.pdf
    • http://marketherballize.com/ckfinder/userfiles/files/donador.pdf
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/f32e33031d8d28b78e9717ddd840e74d/62664750622.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b6625be76---gaget.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/2p45cudv28iat9b2qcms1rq17h/sifud.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2769f421d7b6173023c70b06159b9518/papoge.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/e8jvknst6a4slekq0f0ola02e0/wigafanuk.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5373ac28b3---duzenidutamojos.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/jjsjv4fk5063g32g1856bh0vqb/rodixanilufidarujogox.pdf
    • https://samowar.me/userfiles/files/49392490113.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a77d42b489b---suxurekenebofozaseridaf.pdf
    • http://orchid-daikanyama.com/userfiles/file/49954482854.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+become+agent+club+penguin
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011f9b.bin
5d8df8e712b9021beb3bbe96be3f7f8450a28133ce0f37cdd6f0af251c60454c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9B 16668 bytes
font_01_sfnt_off00014ae0.bin
1a3bfb5859db878793d1dce9dcb2619c06f763a41c8f0791fa5d667d8bd1549a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14AE0 10764 bytes
font_02_sfnt_off0001636f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1636F 16792 bytes
font_03_sfnt_off00017b7c.bin
45f2ecf1177284e78bc6a03121bc3fdc8afcface03d6e9c4c1507cb67f43bd82		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17B7C 5196 bytes

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