Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ac1a0a432596b41…

MALICIOUS

PDF

93.7 KB Created: 2021-07-04 23:14:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 71268188b547709661dba95d0f972c88 SHA-1: 67e36fdc5b7c6b7db8f2aaeb37fa967848e807fc SHA-256: 2ac1a0a432596b417251372f81e0793433c590b3c6a340e0d9aa15776456de52
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress upload directories, indicating a phishing or malware distribution attempt. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The embedded URLs suggest a tactic of using disposable hosting and compromised CMS uploads to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aab121ab606---tijexozokewawiwofurudelus.pdf In PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/45031195048.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/10831928809.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/ba616bec4ae809f4c2bd0da773b5f1f4/90441633557.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b57a52bf8---47098609729.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/00305667d62c0a068da7f4e2a9dcc4e8/suzojexuxoxomatolivi.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/jasixaxewe.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/9a380049ab1dca0a11649390ca9cf37b/3959133633.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/o7h5t5k8atud0j7bveja91jh4o/funatigawujogopedoju.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9c5a94906---gapakesepekosetane.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/buwakaxavik.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d8975d53a---pepemufepozixifi.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/2a7603fe3269560a80aaf7fbf7661806/pixutelabuxuzew.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/rogutokoletajufuwudajas.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/72q0koc16nm5atr8tsr6f3eso4/lujogazito.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16090f3df71d83---53088446710.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608775394892c---kamubekukugoxaratexozukim.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/1520350b76412cf8e6b862fc94f2b289/nabanexobebewuja.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160e1057d4e2e0---93891496186.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/4d164e34e7a035f72cca8e193ab45e26/gekad.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/89589584632.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/pugjavh7ld57l8qcfhnlgqgqok/wobisu.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/35387a00b15e4ba3d4be3504c477cac1/juwilutox.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf8fb81ce6---kabunot.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945b642f517---pugefe.pdfIn PDF document text
    • https://okna-stv.ru/userfiles/files/31395538773.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=ark+survival+cookingPDF 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_off0001004f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11861 28416 bytes
SHA-256: 7fe647c22edd06b4ef90b8fa6c0586505c5e210205083516f210095ab70b35bf
font_02_sfnt_off000151bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151BC 10412 bytes
SHA-256: 9a53d5ce974c0ca7a5927aa32d433475de736b93a58240025b830ca51f79becb