Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa28d627572beb3b…

MALICIOUS

PDF

85.6 KB Created: 2021-09-06 06:53:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2a028762f71707863c24752dee297cd8 SHA-1: bd86664146fd281fa5537b8d92ae022ecf49ad14 SHA-256: aa28d627572beb3b02a0e1d5aaf63187f2f2b2796b00286d5d6112d19c25a85b
164 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 presence of embedded JavaScript and numerous external URIs, many pointing to compromised WordPress sites or disposable hosting, suggests it functions as a link farm. This pattern is commonly used to redirect users to phishing sites or download further malicious payloads, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://98ing.com/upload/ck/files/20210812_135045.pdf In PDF document text
    • http://dotbamboo.com/file_media/file_image/file/zoxomobepowuveva.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607276f8684e2---2342819348.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a8fee934f90---xutapun.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/58694183326.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/69591972360.pdfIn PDF document text
    • http://cieplej.pl/imgturysta/file/simasubekurem.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16103058b33fbc---87518925954.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079bc6f1e738---74539648687.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/7259f75112570d4f0629b0a02d3bf214/80875994846.pdfIn PDF document text
    • https://profitaler.com/UserFiles/file/15434902112.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/6b332ad773c7f0d8e7688a6dfa2bb0cd/31174768392.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/diget.pdfIn PDF document text
    • http://nessium.net/userfiles/file/nupizukilexoposux.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/9e3ad7069ed6486b20195e5310cea2cb/5827612227.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbe8285d99---pilofewixaxejunaxubumabo.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c38ce971272---vewimamis.pdfIn PDF document text
    • http://namlinhchivietnam.net/userfiles/image/file/62646268983.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160812b09114e7---60525720593.pdfIn PDF document text
    • https://digireg.sk/upload/pidaxupelu.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ccc066f25---gafanovetipug.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/ab1377523526d761a754be1cd4ec3c5f/solejamorekazaxotak.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a145157e9---64433557418.pdfIn PDF document text
    • http://neboskreb-irk.ru/uploads/userfiles/files/zapofepinijaxa.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/59380454609.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/29420614728.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=maximum+ride+comic+book+1+pdfPDF 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_off0000eac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC3 10844 bytes
SHA-256: fd75d0b71db31c5b3f44090e3a9f74bae05d8e87c475705d3fcf1b09ac2fb95c
font_01_sfnt_off0001039d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039D 17252 bytes
SHA-256: 11dd546b492c7e692ae5e2a2d04c35cc02e5dac867eab4d00ddec28143475d28
font_02_sfnt_off0001306d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1306D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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