Malicious PDF — malware analysis report

Static analysis result for SHA-256 3875658829f484b2…

MALICIOUS

PDF

88.2 KB Created: 2021-08-04 07:49:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8299a5618e248758133993baa37300ba SHA-1: 7fd730f42243533d0ff643aa6243cfc10344e817 SHA-256: 3875658829f484b217c7ff0c7578de46bb886d084e6b80c1b6bfc864f4531755
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories and other potentially untrusted hosting. This suggests an attempt to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/10a062d9e874805e3432d95e32ab77aa/lefabiwamoz.pdf In PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160957a5d82596---koxulilanewinomamogufij.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/57068130778.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/247630259a1f6d949f9476ebd72a749e/20969012284.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/50872416144.pdfIn PDF document text
    • http://mousike.it/img_ins/files/67963157273.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/5a55430c4f33107ba6db6a5f0a307c99/17846210796.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/lejerogovorutok.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/1b0d1e568da6c8473df4e339175a16e2/zazavepesufitesaxuserireb.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/sofudasimudubuguvovix.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/gelesajaduvizusu.pdfIn PDF document text
    • http://kusadasidentalclinic.com/img/userfiles/files/65477015240.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/e88582ff0517c4543d3522dc342d28e3/11509768545.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/wumimuzujo.pdfIn PDF document text
    • http://fedoro.ru/upload/file/kikewutabasopotosod.pdfIn PDF document text
    • https://mcrlclient.com/ckfinder/userfiles/files/guginutokabarudok.pdfIn PDF document text
    • http://edumedcare.pl/upload/files/zomekosejabufamojigebudib.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/57650646895.pdfIn PDF document text
    • https://reinigungsfee007.de/wp-content/plugins/super-forms/uploads/php/files/gec47unv4ins925883soi34aak/60186235845.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/56219990883.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16070b693edc5d---fuwaneniwuxekumobudase.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2185acad7a---zasiderofawe.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/tenavegororuwovekiwiguvu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=types+of+cargo+manifestPDF 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_off0000f55c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55C 10852 bytes
SHA-256: d1d8b49e096520d2880e96fd635caf0b8bcc5333aa0ee497b0625fb51edfa2c7
font_01_sfnt_off00010e7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7E 17184 bytes
SHA-256: 96a81aa929933dc6a7d5faf5563ef1bc478fa33f66cfd76863c7c97958145d72
font_02_sfnt_off00013bce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1