Malicious PDF — malware analysis report

Static analysis result for SHA-256 e665a1ee6b041665…

MALICIOUS

PDF

88.1 KB Created: 2021-07-23 07:08:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1ced72e1c4b01dbefaccb0c9421aa4bd SHA-1: 56719132607eeaeac5c54879f72b804771d4f4d7 SHA-256: e665a1ee6b041665225047a7b6fb5df83df884d6472f5550d77def71b17e4524
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing or trojan. The 'SE_CALLBACK_LURE' heuristic indicates the document is designed to trick users into calling a phone number, consistent with tech support scams or fraudulent billing schemes. While no scripts were extracted, the PDF structure and embedded URLs suggest it is part of a link farm hosted on compromised websites, likely leading to further malicious content or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • 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.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/a5db9b331da12e1ea5db1202186f5873/sitatekofeneduga.pdf In PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160755ee52bb6d---zirubupab.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160819d4738c95---sanogemitipenulaj.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/46283805350.pdfIn PDF document text
    • http://zlato-invest.cz/upload/files/wozukuzukipotabelil.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210620224301152.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8373bd9c9---87761660466.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/807dde28f579f0c5be22ed1ef2bdc941/sosomukodo.pdfIn PDF document text
    • http://parkhighclassof60.com/clients/871169/File/zuzewe.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/xijotufus.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/e236fe82a2bbeb80c5912f549932d2f6/41990110549.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/24ec01bc92cc373d9d7c88fb2c44e504/wirigepomokapotuwek.pdfIn PDF document text
    • https://eitmedu.in/ckfinder/userfiles/files/tulilomi.pdfIn PDF document text
    • http://teknis.it/userfiles/files/suvidodaf.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/m4bl4d9euop6fpvm0l9qgm2dpm/36314850958.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c50a2f9ab0c---menumigisavivake.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/leworoxijira.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/bd94bc9df1d56d999927fff81e52f82a/40800595942.pdfIn PDF document text
    • http://placc.info/up_image/63525959381.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/024rh93ckus61tp46omb1d5hpt/doxupimilefef.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/polobavapew.pdfIn PDF document text
    • http://dlmberatung.ch/userfiles/files/janurepegutexa.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/dugufoxuvizuked.pdfIn PDF document text
    • http://liily.jp/upload/file/20210722114915.pdfIn PDF document text
    • http://ghhs1968.com/clients/5/57/5762190d0a265df614d1f295a7060a42/File/mexewotuzerok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=hand+holding+heart+drawingPDF 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
stream_007_off000134e7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x134E7 18456 bytes
SHA-256: 1fa02b3348c41ac057c993284ee24d957e16241a3fbf3f121bed3520c9000955
font_00_sfnt_off0000db5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5D 16272 bytes
SHA-256: 235291c0555a269eca993d0ff2efa3753eec427fb50fd23f3dcf6eb632a062a7
font_01_sfnt_off0001057e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057E 10436 bytes
SHA-256: 8e44cb777ef5c66daee0e29da1dd472eef548c8479341144dc493ed026f966a2
font_02_sfnt_off00011cd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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