Malicious PDF — malware analysis report

Static analysis result for SHA-256 55955c976a3fcdc2…

MALICIOUS

PDF

99.6 KB Created: 2021-09-02 05:34:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d9203eb8dc20c23b889c5b952525af76 SHA-1: 7b6ada860957dfb1a8172d92400c8e957cf32591 SHA-256: 55955c976a3fcdc267ca82d255aedebe844da7f0dbccc5bcf64376a69ec6eeba
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs that point to compromised CMS upload directories and disposable hosting domains, suggesting an attempt to redirect users to malicious content. The presence of multiple external URIs and link farm heuristics strongly supports a phishing or redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://gernano.eu/gfx/userfiles/files/10077382714.pdf In PDF document text
    • http://blfimmobiliare.com/userfiles/files/kulojalapu.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/wumiwojebifuwulu.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/50600458226.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/5318ed17cfa71b66acdb65c4c9f4bf62/37775388123.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/91551613094.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160c286f428a63---vutazijifajafim.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160799ba41feb5---sonov.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/9a876a0d2e01c28205ad4d91e33e126c/31895371029.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/45153853333.pdfIn PDF document text
    • http://coinmarketsuite.com/ckfinder/userfiles/files/50246093549.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/40712705715.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/3878893196.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/8798cc405190b9a959a3b78f17f19f0c/fiwipadunuxitexivesin.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/vakopawaxamoxezesapar.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/27447253076.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/acoupu7lhu77153e8u8jhn95f3/xurekuj.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/xojimuxovavafuxasixisawi.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/2b1be14878bfe9bb410ccc2952f07acc/venaputowedajumuzavosa.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a567a8cd98c---33781852542.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/161f64d15315b302433af8aa9d736546/4985837788.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/sulirunawoxuba.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/14793074068.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=gaussian+process+for+machine+learning+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000112a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A3 2064 bytes
SHA-256: 5221cc56e96b657ff7c15f49bf1fbf1b5222e15cd7ffd769ce953162a3e53832
font_01_sfnt_off00011be2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133F9 11108 bytes
SHA-256: 9b99e9356fd3023874be1725c03934d2375acbb16ebe435084a52145b190b6d0
font_03_sfnt_off00014d6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D6D 19072 bytes
SHA-256: 508cc15f55f4bb3a8978c992424dc7ffdc30557b93c0f5af656d2c116229b965

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