Malicious PDF — malware analysis report

Static analysis result for SHA-256 58b6a4bb6a603fd9…

MALICIOUS

PDF

131.0 KB Created: 2021-08-01 21:06:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b87b79fc152a9d6de8b966047211a92a SHA-1: 94ce0f34d5fabfba1763fdba5e99aca067be8050 SHA-256: 58b6a4bb6a603fd9aa3e2bed4547fc772d1dca85133b1922bfcde66b4c12837a
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. The heuristics suggest it functions as a link farm, directing users to compromised websites, likely as part of a phishing or scam campaign. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of invoice/payment and callback lures points towards financial fraud or technical support scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/ik0du68g9blqgfd9r7g4lganpe/13485304034.pdf In PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/losel.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/vemotus.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/61622653234.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/55790706842.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac88ed20ce---jefosipezesulipopinuful.pdfIn PDF document text
    • http://adveotec.com/img/file/gatoxuxoziw.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dcb98d36aa---70782563956.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/kifiwuxijikutokor.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0c2738b007---kezemusosunitofuse.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ac304d150d2---8704935687.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080d2cee3ec9---64069880137.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acfee54be15---mujekotisazijofomef.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/56623590051.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0e4a4d712---dejoxutuxowujus.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/sazubudimo.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/47002367288.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/zepezi.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160dca3a41072d---40519483186.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9154fe91d0---vepebosorusodi.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210621055717.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media//54616914034.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/kvtr1f27lb1c92js3vqfkgqt1l/38098489258.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=vat+193+form+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_off00019fc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19FC3 10480 bytes
SHA-256: d670a417e100410ab75aabe943f24032c61b8ac608aeac89b339b93c95926cd7
font_01_sfnt_off0001b7a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B7A6 17912 bytes
SHA-256: 68de8710d476344c3eb2ca403d0bed8d5fc8bb0c1429d8b81ff334a070c8017a
font_02_sfnt_off0001e618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E618 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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