Malicious PDF — malware analysis report

Static analysis result for SHA-256 a12553ff09d8e906…

MALICIOUS

PDF

84.3 KB Created: 2021-09-06 11:14:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: efd4e86b6baac2b7db9454e14f84f446 SHA-1: 88cfdc37342b1872aa8eb9d6fd2ba8d8a31b1a53 SHA-256: a12553ff09d8e9065399955b1c8f4b4755056cded269dfd7035829113e655ca8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://unseenadventure.com/userfiles/file/mutulaxifowijojibe.pdf In PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d948d0982---nepopezezurigakoseduze.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083048e3f357---13919096769.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/tetosabewelisatosujovo.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0307f15f9---17341107877.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a639e3b4ef---40695187843.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160d338ee9980c---48496796463.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce78bedea0---rokipiwilenilitezozope.pdfIn PDF document text
    • http://www.serge-valentin.net/ckfinder/userfiles/files/21494042498.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091bce1ca2e6---58069871337.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/58981730769.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160c876d5727a2---tivufoxixivefit.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/77922205960.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/9d80283484e2d180ed5585dd53c84dae/sululewedit.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/raxope.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc5d345d92---kolijabazoguzezab.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/lipewega.pdfIn PDF document text
    • http://jarosi.hu/files/file/82414571091.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/nozududapegiwogejavafe.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/tis5r9bdbqkppdrqnne8jfedqr/papasipume.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16088882ba6d3d---doxepuxudiva.pdfIn PDF document text
    • http://kimura-shihoshoshi.com/userfiles/file/39439709273.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/tukunojurowalewikikef.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/2k6us6asqhpou1j4e1k2deo5f2/52342662736.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/50254026312.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/92622895803.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=modenas+kriss+100+manual+bookPDF 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_off0000dad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD9 21084 bytes
SHA-256: 64df53090198a43e66ff0e655cd2b130c0315920b7794bf3fa43ad517bb1dd96
font_01_sfnt_off000112ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FF 10812 bytes
SHA-256: 9b79d3070261f8038e810b50ea04ca3282214cd96588d417b6a44890b2cd53f4
font_02_sfnt_off00012be6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1