Malicious PDF — malware analysis report

Static analysis result for SHA-256 430b52717ddc17d1…

MALICIOUS

PDF

77.8 KB Created: 2021-09-14 14:27:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 20a82e2fc797d48b574e67e5b6654438 SHA-1: 20e45d575d611cdd273eeb27b2145b53e0e72276 SHA-256: 430b52717ddc17d19f8f94d025b9ae8175806a65dc3d80dbba1ee9afd9008be5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Additionally, numerous URLs point to compromised WordPress sites, suggesting a link farm designed to host or redirect to malicious content. The ClamAV detection and ML classifier strongly indicate a phishing or trojan payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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.
  • 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 http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/26420cf01cc34c14c743ed5dac0efa83/74778476378.pdf In PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/01c34ebc827243aa72d63831845528a1/pegaxebemokubuvus.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/vujawamug.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/putikov.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/29445471281.pdfIn PDF document text
    • https://mashtalkandil.com/userfiles/file/36471812252.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/43314125964.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/goporebepelixig.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021091214452083.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/70042434132.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/bimalalerarogutureter.pdfIn PDF document text
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/94126713516.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/4682011445.pdfIn PDF document text
    • http://www.icareonline.net.au/ckfinder/icare/files/badoba.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/wokiresepizijipunarew.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210914/files/20210914152934.pdfIn PDF document text
    • https://alohasafaris.com/files/83407121851.pdfIn PDF document text
    • https://kede.org/userfiles/file/49117530234.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/4c83c2e81de46343afb5bc7b174fa68d/kafoxajojana.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/51245554411.pdfIn PDF document text
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/munofapumilinazusanawel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=no+puedo+instalar+aplicaciones+en+mi+androidPDF 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_off0000cb51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB51 17716 bytes
SHA-256: c1c2b9e50e907d4827464b83699d1cd33047b41626364be76f4336f4c5607ac7
font_01_sfnt_off0000f8a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BD 10752 bytes
SHA-256: e107965dbf216f82001547c5f0fa348f2845fd3aca6298aaa40586a47512f43b