Malicious PDF — malware analysis report

Static analysis result for SHA-256 aba5152e2e8bd834…

MALICIOUS

PDF

89.0 KB Created: 2021-10-09 03:19:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b5efe4b0042c59535f59463395226e88 SHA-1: e89fa2ff62b5fa45613e46dcc4d47ee215b4cd74 SHA-256: aba5152e2e8bd834310ab17907c875e47921249b62b8e1aaf7dc2bb9ac56dca7
272 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits multiple high-risk lures, including a payment redirection scheme and a request for secret recovery information, strongly indicating a phishing or scam attempt. The presence of embedded JavaScript, flagged by heuristics, suggests the potential for malicious script execution, likely to download and execute a second-stage payload. The numerous external URLs, many hosted on compromised or disposable domains, further support the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 10

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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.
  • 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://smidgel.ru/uplcv?utm_term=ftp+server+for+android PDF link annotation
    • https://afayl.com/userfiles/file/dafomojonixoruwededelubet.pdfIn PDF document text
    • https://szemvidito.hu/sfwkr/feltoltesek/Images/Image/vuwidanoxaveroleluremi.pdfIn PDF document text
    • http://espaciocultivarte.com/ckfinder/userfiles/files/91809001469.pdfIn PDF document text
    • http://maymaygiaydachidang.com/upload/files/mokivexi.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d73c0077e8---85674196478.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/87195606864.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/hr7v1vktgvn9hp3rnph88u1eot/roxadasuridiruborez.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/5qpm3a8q1fj6nkg7efq68hadsf/22924739184.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb9321829c---94806916981.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/e8de1f81d56f661cac9f52ca6c6d3310/239926689.pdfIn PDF document text
    • https://inprovitcolombia.com/ckfinder/userfiles/files/zavamejenoxozufetinegi.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/xaninujaviwewesewimi.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/11885669481.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/12940987399.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/delovavofalapiza.pdfIn PDF document text
    • http://lokalizacja-gps.pl/userfiles/file/47060740463.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/gaxagekeduvepozetuwuze.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/teludekegekomepenolosep.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/370504118.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/wobatapalijaf.pdfIn PDF document text
    • https://airin.lv/images/userfiles/file/vewivaxokezilela.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/ximowazasezo.pdfIn PDF document text
    • https://bkairconditioner.cloud4demo.com/uploads/files/61726594857.pdfIn PDF document text
    • http://bangtaisay.com/uploads/userfiles/file/sojomaxemok.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/41472223930.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/48433992532.pdfIn PDF document text
    • http://apartament-krokus.pl/userfiles/file/2086217378.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_off0000f1bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BC 19924 bytes
SHA-256: 91e2db8de6326660e4d9d2ad9eae233ef41589c4445112e9369de7fbd22a4afd
font_01_sfnt_off00012648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12648 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E5F 10488 bytes
SHA-256: 9c71176a28c1237ee72e4e301d9ae28cb4d4c431c2e6eb8421757b2ad553e613

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