Malicious PDF — malware analysis report

Static analysis result for SHA-256 a571fbf64688332d…

MALICIOUS

PDF

81.4 KB Created: 2021-09-07 11:01:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a1976db234d63fca86932a39fc2c4dc1 SHA-1: 238d684c132c1245bc2b94e5fb57e67607ead1a1 SHA-256: a571fbf64688332d421a0e7f36e109f4f5f491466455d20c784555d465e54355
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous external URLs, many hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://rialta.ie/userfiles/files/99476536511.pdf In PDF document text
    • http://xn--z92bzy85x.com/userData/board/file/58588411156.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/rigibogekupivek.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0ff0a4214---nuwenafufawewelo.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607678f2290ba---jidiwunamef.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8a1d57e63---fofuzire.pdfIn PDF document text
    • http://tieclangman.com/Images_upload/files/19145101009.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/sivitejawunogazemosepol.pdfIn PDF document text
    • http://www.propper-droppers.nl/files/file/5866133357.pdfIn PDF document text
    • http://sonsuadogo.org/Images_upload/files/patigobabugesus.pdfIn PDF document text
    • https://youxsoft.com/uploads/files/79047741398.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/20729061849.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c181a950194---sukakirogebod.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/72ea7f3f6a0cc1f028e7aacf34fa0878/jopixetukelunasajipilof.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/xalusojumirugafaxumewina.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acaa41bb054---30598415478.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7eccd0057---13491608129.pdfIn PDF document text
    • http://cutskytools.com/d/files/zidamokudupuvi.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/30c2004e64719b97f7ae987274a674b1/48681561993.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f236207a5---58518155574.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/ralibidavoperafib.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/cff7fba96setmugr57pfc14l16/38364156120.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=akademia+pana+kleksa+lektura+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_off0000d820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD820 10712 bytes
SHA-256: b055055017f5a9bb0283853c412a59a001d254a80b121521d472bc68dbaa8b40
font_01_sfnt_off0000f0ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AB 18584 bytes
SHA-256: 627b26f282eb8e649fc97cf8bfbbfca72a4a5fe05dc35e2543bcad9012bbfaa6
font_02_sfnt_off00011ea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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