Malicious PDF — malware analysis report

Static analysis result for SHA-256 9588736b7fe1b515…

MALICIOUS

PDF

87.6 KB Created: 2021-08-12 12:02:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a4e2f6e31bbc3d1590f4dab675eabec6 SHA-1: 841dd8757569a6df589db32c95a2af342e66dc6e SHA-256: 9588736b7fe1b51512a74246fa1db96b0560d542deac4911d809a4c49b9b5400
184 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a malicious document, including malformed streams and multiple heuristic firings indicating it is a link farm pointing to compromised upload storage. The presence of a visual download button lure and numerous external URLs, such as https://queure.ru/uplcv?utm_term=roblox+mod+menu+download+2021+pc, suggests an attempt to trick the user into downloading a secondary payload. ClamAV detection further supports its malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://queure.ru/uplcv?utm_term=roblox+mod+menu+download+2021+pc PDF link annotation
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6fd916440c---39995840300.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/39827857483.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-07-25/21072523352473548210cswg4ulvvs.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/384e2ac0a9579115ad8c1ab71a4f5d94/99580595906.pdfIn PDF document text
    • http://acquadiqualita.it/ckfinder/userfiles/files/dadewaxaxemofemiwokabeb.pdfIn PDF document text
    • http://medica-brno.com/files/tugukorin.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/54656213588.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/diwilafezozeko.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16084bcd9d4933---91752827921.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/wuzizenunapos.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079cac2007dd---nogali.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/juropulojaj.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/rujabozep.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/h48tvh6cn2h9fhs4j17r07kp2c/wudixanavetovape.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/df2b3e1a0ab74f9b514056e00fc6e7e2/96770862301.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b12ac0d52---ginedudametina.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/55292813423.pdfIn PDF document text
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/10410342747.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd725561ae---kawisirexerepelulapa.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/qaq1e0a959qhdtjdsbbnac3858/vowuwafenato.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/ruxemipafobawejaw.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160af8c02d8480---72506528324.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/4ac0b3c3bfdb7ea964c8b5c05de4e13c/6783976832.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1621918211.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/5f83f0dbbefb5e0179416907aa56cec4/55513049387.pdfIn PDF document text
    • 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_off0000efa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA8 10984 bytes
SHA-256: 8be72627281c848ecf993eec0757f6b079b43916f2fea98908f320ab1b0492fc
font_01_sfnt_off0001090f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12121 17516 bytes
SHA-256: 23f64da06628dbef60427a99bcaa5fdd045324545dc9758b0006d7cec7cae49d

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