Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd36dbba53c722d0…

MALICIOUS

PDF

95.6 KB Created: 2021-06-28 14:02:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 1d863c34a04bc1e3fdeb214efd21d71d SHA-1: f0d27d3f356f33f28553f560a433f0c19715cb03 SHA-256: fd36dbba53c722d0239fd9fba5689c72716863fd490a40d564f9e8a99341c9c6
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning model as malicious, with ClamAV identifying it as a phishing trojan. The file contains a link farm pointing to compromised WordPress sites and a deceptive download button, suggesting an attempt to trick users into downloading further malicious content. The presence of numerous links on potentially compromised or disposable hosting reinforces the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/gao1q3veu2ktc4095c0d9rrhdp/92210883931.pdf In PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c68c28bb8---joselok.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/xewupomuzomofabaxore.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd5bdea3e3---36818083737.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/18547339115.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/6db553fe6fe8b84eeff239ed10678623/24278697593.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e6126f6a4---58623321203.pdfIn PDF document text
    • http://kangs78.com/clients/66216/File/54970186069.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/42dd9e902c8329820531ef1b02603403/90540065356.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/850021319.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4838fc638c---lovijumatiwakiwixip.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/f0529d6b0580ff220c02958667bfea1f/febaxupitosakufogad.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/e7kp30h8sld31f3nde3dbd37pk/43682154399.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/rqvo5lo6mdd5slpat6eeopecb0/rerozisoxepijo.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/wipufedopibizironaro.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c80360814---18945991203.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/2097f4ab78a0676ed5601f8e8f0bc473/zexiwofuvutobejibadoniru.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/c6ee7baf481489ef8120f3ca451d82f4/57883551623.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16070480aa62ee---mafarafiliruxinujizot.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/40297018508e6f746816733a11474f93/ludedelosefaxijug.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/rozagafenileditetotefinum.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/vusinavitebom.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202105280159373540.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/57619548327.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=jee+main+result+checkPDF 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_off00011249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11249 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012a60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A60 10560 bytes
SHA-256: f3a9ef518ffb357400bab192cd8b173dcefe7778ec9cca32ca3e2b3f71f144fe
font_02_sfnt_off0001423c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1423C 17916 bytes
SHA-256: 3a6bb019550bed3353bb228dcc5ed5c28b12305509ec4ecc75e7bfda575c94ad