Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf1bfa6f7fd726ae…

MALICIOUS

PDF

90.2 KB Created: 2021-09-06 00:52:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ee20a3c15e109a9c6ccdeb6ce3215419 SHA-1: 64e5dd493c857349aa6258ea162b7a53fb1e944c SHA-256: cf1bfa6f7fd726aeb6e5fdd4994c0b3f777386bca4e6373767775c0b040c7de3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites, suggesting it functions as a link farm to distribute malicious content or phish for credentials. The PDF structure and link farm heuristics strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16075455c78a25---14957288318.pdf In PDF document text
    • http://youzedu.com/ckimages/files/20210823150208852673.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/c57v25fq3cluct546u444ngfae/modorizexenar.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089eef3cc16b---gifuxituwu.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/sokipuxuk.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/mn1mnoio0gaa5hk9ue4h69n3b2/rubifivowu.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac30ca765f2---sibujiwuferima.pdfIn PDF document text
    • http://mysistermyfriendministries.org/clients/85776/File/pokuxidanakosabitatuje.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/69300312275.pdfIn PDF document text
    • http://safiorida.nl/operatori/userfiles/file/49201233650.pdfIn PDF document text
    • http://xn----7sbjvweekof5d.xn--p1ai/files/files/22181933226.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/40330090873.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/zogovoladapexapuginelogo.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/9b271323513a07c43aff7cd603ace1bb/bogimuketewaxaboteror.pdfIn PDF document text
    • https://muzpony.de/obrazki/file/41096629778.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/65529549408.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/j6f8t38uivihf41dpkn88oii34/76959986012.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/7093350427.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6069bf14ad---19044549670.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607933aa23040---dofefetigadobusemetafiva.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/30392206750.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160cf37f64dc8a---1927399441.pdfIn PDF document text
    • http://centronegozi.com/public/runuwisotodaginetoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=articulating+design+decisions+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA03 18596 bytes
SHA-256: 2cf6d1913b70218a62277c6716e04c1e35153029d858d2b5375c34faf2ea0441
font_01_sfnt_off000129b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B6 10876 bytes
SHA-256: fd3792c4786c7104e8b1e9537c7a3ac22633996233fffd15a8655b32def50d73
font_02_sfnt_off000142c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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