Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d29a4bc1cadecbb…

MALICIOUS

PDF

79.0 KB Created: 2021-08-27 19:55:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 06f1a04291eb640590614b94e76ca3f0 SHA-1: 13c98fa078467c07d65f1929a934039399befbfa SHA-256: 1d29a4bc1cadecbb2143a0b574d95f6dc2dc3ee30e7c66b2327d6a79548328ba
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The presence of numerous unknown URLs suggests an attempt to obscure the ultimate destination and potentially distribute malware or conduct phishing. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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://nuovojob.com/userfiles/files/79190921989.pdf In PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb1edabd9d3---nojonajebumuk.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/joral.pdfIn PDF document text
    • http://didopack.com/files/putobefedobijivasan.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/96124329697.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161080c4a3b449---65902639731.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a271de40419---kewisulezobusuzokaruri.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/wodukeboxulibugafa.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/2f09s2idv15s5grpas43gtd0v2/pixapifuzidiwapuwekowiwe.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/murobiguvesavab.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/12395675482.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b1174a6b58a---10740639063.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/pabewevixunugixebo.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/121501358033.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/genafonu.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f5b20247d---tekewusisaxopabusamebap.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a457919822e---sezagixadumabise.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/seriwikuwalanikagunubete.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/161271585a5ee3---bisofumupawularepewe.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/280563597.pdfIn PDF document text
    • http://win-sonic.com/kida2018/ck_imgs/files/sanurejamojafuwejeve.pdfIn PDF document text
    • http://photonart.nl/phpcmsys/file/93230000083.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=m+and+g+dividend+fund+share+pricePDF 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_off0000cee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE3 10792 bytes
SHA-256: bca49945567544c8f88e29bad87366a3168a4c17eec59d46372e9a4fa21a8387
font_01_sfnt_off0000e77e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF90 18020 bytes
SHA-256: be7b3fbe2f60612ba930e87b0fa4aa27123bc158c08e6a0947412dd81df6fa7c