Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2730e55d4d2e3aa…

MALICIOUS

PDF

72.5 KB Created: 2021-09-26 03:56:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8e4f8ec2e1b3c56a792ee5305cc6e8d5 SHA-1: f8e3acf45596b377e76da1b149ea3a7bd234cd2f SHA-256: c2730e55d4d2e3aa25c2560ac757f3029d158f2a84bb240930e5913374708c69
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The presence of embedded JS and the nature of the URLs suggest an attempt to deliver a malicious payload or phish for credentials. ClamAV also detected this as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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.
  • 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://oniceh.ru/uplcv?utm_term=how+to+turn+off+proxy+service+on+android PDF link annotation
    • https://excellencetogether.com/img/files/file/jijidimekotexukil.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/10587064406.pdfIn PDF document text
    • https://molecult.metallo-tests.ch/sites/web/upload/files/98887944857.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/63386676781.pdfIn PDF document text
    • https://mcdelandes.ca/uploads/file/88221750674.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161330e6e74ae2---tujalopezukenopi.pdfIn PDF document text
    • https://vnjhanoi.com/upload/files/wesarabamodufu.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/72226251415.pdfIn PDF document text
    • http://irfanmakina.com/depo/sayfaresim/file/podumaxame.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/waluxogivabexeratex.pdfIn PDF document text
    • http://kunbot.com/upload/files/bumivekuzumes.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161412601b26e5---vakakasapupitagofumiroku.pdfIn PDF document text
    • http://ozdermusavirlik.net/userfiles/file/nunare.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/majimapitoxex.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/kovidekifozivizoduwufat.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/67647413031.pdfIn PDF document text
    • http://tongrentangthai.com/UserFiles/file/sogofaj.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/8a40e8c3e2188b6858a4b4214fcd0798/bokezeboxorowanek.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/83310378502.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/goguzomanufepoxiz.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/luzosasivewefuko.pdfIn PDF document text
    • https://swapnauraan.com/ckfinder/userfiles/files/zekavar.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/9055541193.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/wefew.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/zumipege.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_off0000b491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB491 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA3 17980 bytes
SHA-256: c1c2722815d6fab8ae11df8d65ed4864478ecd451dea3a38c0fd1559861d705f
font_02_sfnt_off0000fa96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA96 11028 bytes
SHA-256: 18a3675b8345dc247bf5f8ee02d040d93be78370a460dd4603f361c51fd0095d

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