Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dd39a97fcc6bb71…

MALICIOUS

PDF

82.2 KB Created: 2021-06-29 01:54:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4c453f873f047a49bd75b2b495d1cc20 SHA-1: 003f5254a810789517362cc7822320d78b858863 SHA-256: 7dd39a97fcc6bb71ab22813e4c5839553b07c8975c973148bee0cda4000bc93c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs that form a link farm, directing users to compromised WordPress sites and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of multiple external URIs and link farm characteristics points to a tactic of redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://cructi.ru/uplcv?utm_term=reported+speech+statements+exercises
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/65f4g1mct6h9g0m8uer0a7fphn/5183014819.pdf
    • http://www.awakohchang.com/image/upload/File/ixetetozezimon.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160784ffc6ad41---zefokasipexafipewakati.pdf
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/82f5eb5712bacf03d27a0adc7d03b849/meseravukidavomobewejeber.pdf
    • http://yourbuilding.ru/userfiles/files/wenugoges.pdf
    • http://samilove-payitforward.com/clients/f/f9/f9b0b202ed5d2cb263a89f8a9bd08a94/File/bejesunidinafaxaniwavo.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/5bb51550d588c65e56a4ce0964149362/54645518698.pdf
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/a1s2carjksa8t9lotil1pbr390/runopipode.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b11b65b87---jutanutubuvi.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd8efaacb0---90596129683.pdf
    • http://haphadoor.com/upload/files/wupijud.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d21a4520d5---sitijubosuzepola.pdf
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/35720cf95d7cf362c86c4ed9b04683fb/rotuwudel.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/c1bda2fe0762ecc40e619a9b5e770644/dikefu.pdf
    • http://permanentnimakeup-brno.cz/userfiles/files/pudowofisezilul.pdf
    • http://zentrumok.com/userfile/files/nenajifeb.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607719fa78558---pareduwinufibaful.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609055eddddec---pidetibekanowofirukuxu.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077faf21b557---32610886332.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160b90f6ebcb3e---viwojewilal.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/518349d8b5925a40dde35d74c27075ff/95978832139.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/voeeaibeii8h345an2faflvrbb/purekodojamevo.pdf
    • https://petala.gr/userfiles/file/2323466720.pdf
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/8a0076939135ded75f1683eec9a1b4f7/16817782904.pdf
    • http://nsdadventist.org/FCKData/file/fenunopi.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_off0000dad0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD0 16792 bytes
font_01_sfnt_off0000f2e2.bin
973c072dd7b3d67e4d53e4be6258174de16b3e95140c92bd273cf3982773a608		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E2 17712 bytes
font_02_sfnt_off00012076.bin
00a4a6eea9cf7993b29802234265dced5361fe3b05996f1ca94798959a2dcc4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12076 10880 bytes

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