Malicious PDF — malware analysis report

Static analysis result for SHA-256 83bd206ab4b70daf…

MALICIOUS

PDF

108.6 KB Created: 2021-07-17 01:53:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 0435730f921c05eb1e400b43542e163a SHA-1: 5060523f48828e190b870b2f6d93d2310b674725 SHA-256: 83bd206ab4b70dafb2c11a70bcb16cafdc5796e8e036b08f853570560a6d4427
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lure victims to external malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/i38sqjfi6s38gk89evrg6rbe89/67014419809.pdf In PDF document text
    • https://rugsinc.in/UserFiles/files/vabosoxesurekuvajaf.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/rubefipiriguwavu.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/4ebj7jfj7b7e6br9eth7ukgmr7/simuxejanewemimi.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5fa3dbcad---67565630765.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609d98a41706a---34832157904.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210517213244.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/gizipa.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/golis.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/ledun.pdfIn PDF document text
    • http://kaowei.tw/image/files/20210615_011212.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/i6gl0nvirbrchmi0msht2jjcnt/66097795067.pdfIn PDF document text
    • http://canvangdientu.com/images/file/somepavojerujikuzera.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b98ff7c8b6b---11124727261.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/voxivakuwaze.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/59180792792.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/milurunematuk.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16081d2e925b63---31126180557.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094da9b5f12e---27649309397.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/tezitenolurujejigizibufa.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086af8a09419---jixawegigibukukanan.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///dodosatagidumilebize.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=if+wasp+stings+youPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14817 17364 bytes
SHA-256: 6df7d062c17e05b7095e0d3807c26513324abca5d6789044ca42e141af42a030
font_01_sfnt_off0001755d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1755D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018d74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D74 10504 bytes
SHA-256: cf1c1b1673e23e302c514e6c64bc9f8d694f2cd045dd272a4a3932c74696c948

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