Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2b87e005812ec86…

MALICIOUS

PDF

84.1 KB Created: 2021-09-13 05:50:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c8f6c38138f66279e2d17bab799fe9bb SHA-1: 4446b2b3d4c9d5da92c0cc748b68eee53bc05a60 SHA-256: e2b87e005812ec869724bb190869737b1ccc2539bf1209286f867af986f1403f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of embedded JavaScript and a link farm pointing to potentially compromised WordPress sites suggests an attempt to redirect the user to malicious content. The URLs extracted, particularly those hosted on compromised or disposable domains, reinforce the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pestresolution.pt/site/upload/file/2966250517.pdf In PDF document text
    • http://dailymaytrogiang.com/userfiles/files/xevomiroraluzaluwusi.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e357656fa---55477903142.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210905191005409161i5imgt.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/wapusalenixibopuwozu.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/182367530.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/23e52a478432a0f8d33cefa79e01016d/dipogexeji.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/52731075031.pdfIn PDF document text
    • http://www.bash.cl/media/file/24865350620.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/pikizavufut.pdfIn PDF document text
    • http://avesta-hmora.boj.se/uploads/userfiles/files/vodofukonenumamalipik.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210904_EA84A829F2AFC560.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/sozirekobodinugaxaban.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/dixubimaromezor.pdfIn PDF document text
    • https://warungmimpishio2.com/contents/files/5564661558.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/a7a1ba5b5c77cd47c907c2666b457e2c/fexewikilikojazolem.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/wusenikikukuxigoje.pdfIn PDF document text
    • http://espressobuilders.com/app/webroot/files/userfiles/files/9252913423.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/fifajifobipanewuregax.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/98144535690.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/61322734274.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=fts+apk+2020PDF 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
font_00_sfnt_off0000c75e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC75E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF70 21104 bytes
SHA-256: 92f8cccc67dea0c14c517ba32a4b876fc1be39efc5b608cf2a440c86bc8f2c14
font_02_sfnt_off0001153a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1153A 9964 bytes
SHA-256: 23c6b3e97e5d515b743b0e84c2dac373c546596aff2a56603f574f78e4aabad9
font_03_sfnt_off00012b74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B74 16244 bytes
SHA-256: fddcbe21bdf9fb2753729b4ab5b26d7a3fbb01e3fe51d41ab0725360e25c189d

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