Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd1449f4f42637f9…

MALICIOUS

PDF

88.8 KB Created: 2021-07-24 15:45:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3835349655e265de361833782fdba099 SHA-1: dfdd6c927a8fb8c25e72a613ecceef07bbfb9d60 SHA-256: fd1449f4f42637f9107ad382596d99dda19921244b000ebe66520da3ae88d639
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_CLICKFIX' heuristic suggests the document employs social engineering to trick users into executing commands, likely to download and execute a second-stage payload. The numerous embedded URLs pointing to compromised CMS uploads and disposable hosting further support this, indicating a link farm designed to distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/o6nmsjcqd66mjs8l9ok5umjeg0/88794716920.pdf In PDF document text
    • https://charqueadaboavista.com.br/wp-content/plugins/super-forms/uploads/php/files/fbac3925f6f092b4b0a6fed51567cc4a/sijiriwabolarajojumobafa.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/61037353444.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/95090154927.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16097b121579ef---pafibininepet.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082b0afcf76e---jasowafobow.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/50hj1rvbqpluudvm9e5gtjfp7q/24114178323.pdfIn PDF document text
    • http://firegallery.ru/img/upload/23170046380.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/24308303640.pdfIn PDF document text
    • http://yejida.com/userfiles/file/wonizuxajegun.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/rgu2f752h3j77439i53ds6d2p6/62368593884.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e3bbcec45a0e7aab827de2436f7d0a82/97012756675.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/zodojokotibozof.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d917e54fb---gixiwizipafelagubemogemuz.pdfIn PDF document text
    • http://evola.it/userfiles/files/47666792456.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/gamedukunekaluvadu.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9552157c01---16213408331.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/dogadaxifikefemiriw.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097fed759e31---95186840230.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/a559f0204c9960cdaedb9de6ca9d14fe/xejetivuzulebe.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0aadef713---lazaxufubusizeruxemu.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5a6662167---wagolesuzutaduv.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/fadopig.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/97567416045.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/19434811441.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0ba0df677---44626111272.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=gta+v+update+fix+download+pcPDF 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_off0000f3e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E8 17520 bytes
SHA-256: da8133c4927d7c822705fe08b1d148ee06656f7f48abd653253b61468e848ec2
font_01_sfnt_off000121df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121DF 10740 bytes
SHA-256: b7e884bcc1391121c681030601a1bf0199879491e3ec55d4561e1ef1ba7ba6fd
font_02_sfnt_off00013ac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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