Malicious PDF — malware analysis report

Static analysis result for SHA-256 88d5e9303bc9804a…

MALICIOUS

PDF

79.9 KB Created: 2021-09-04 07:56:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4914a24c7c26ef22da6ef25faaadeb06 SHA-1: 9ccc2160bfd6d029548f84ee66a16a09c4315705 SHA-256: 88d5e9303bc9804a19606a06af2f026c5931387a88152709d15848580285b53e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://workcoop.org/fckeditor/userimages/file/20210630034930.pdf In PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/f6649c1f0abf086597d690a324f11fe2/59531010089.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/rarawitedagetiwelifazoj.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/fugudagaded.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d05a6e329---sidurapisidaka.pdfIn PDF document text
    • https://atl-50.com/files/file/jaxalokuse.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/07c64a21740db81093650f31035109e2/worekuzumibixuvekugerabo.pdfIn PDF document text
    • http://miyisz.com/mingyi/images/userfiles/file/pibojefokimibojigagax.pdfIn PDF document text
    • https://matteagianotti.ch/userfiles/files/gosekuzofuwuvemerorivube.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/ziduwowududenosu.pdfIn PDF document text
    • https://novinfasteners.com/userfiles/file/musarukofabumitujagadivuj.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074477ac83ce---mufabimefazodixejose.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/264673476043d3fc02a25705253a6f0d/76919854950.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210624172946.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/tuzonefutotus.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/dolalofu.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608912d052299---4422661670.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/4e613842f3169f1bd98dc37f7e686759/ririxisuk.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/jojodapokibifiremarojubum.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/72191478992.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/77345915124.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/323205990.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/pexelodedejosejenat.pdfIn PDF document text
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/vokuxudutukofawujase.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=levetiracetam+efectos+secundarios+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_off0000d3bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD6 10860 bytes
SHA-256: 3b51a28c1260f835da43b2042d9fde1847431db2db2f7e1f05786bbeb1fd4750
font_02_sfnt_off000104f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F4 17544 bytes
SHA-256: 527187b2d5332923fb81c4f0bd7a87bd8a0cbbcc07841ef2233bcfd407c14013

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