Malicious PDF — malware analysis report

Static analysis result for SHA-256 60b8825d14cc8730…

MALICIOUS

PDF

81.2 KB Created: 2021-09-16 17:53:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a0cef9208f9c5a9dc1dbc2854689f3b4 SHA-1: 431443b6c9db3f4b290d1f0a53d43587637ee6de SHA-256: 60b8825d14cc87305dd6fbf68c81cf0240b7007ada0fd3ac8f87877c5c80d9bd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites or the download of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=how+to+upgrade+to+android+9 PDF link annotation
    • http://angarakshaksecurity.com/userfiles/file/fokabubiluxetutexifegig.pdfIn PDF document text
    • http://www.msjcongregation.org/www/js/ckfinder/userfiles/files/34857936615.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/31428887135.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/63976887558.pdfIn PDF document text
    • https://valgott.com/images/userfiles/file/65625690369.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/ed706d45c656b657c65b092c034cfeb0/41989015237.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/77794593138.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac96bf1bd4---gegalemuvam.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/82953965041.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/75a4dac2909a445f766afaa6ce28f2bd/45930940201.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/5819632570.pdfIn PDF document text
    • http://sanyosushiglendora.com/uploads/files/39459242160.pdfIn PDF document text
    • http://azizolace.cz/images/file/tufedukuzozolexafafujixo.pdfIn PDF document text
    • http://halaljones.com/uploads/files/66641593899.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/baturuwosog.pdfIn PDF document text
    • http://fishngrill.iorderfoods.com/uploads/files/bekepubutod.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/bonukitek.pdfIn PDF document text
    • http://srs-budapest.hu/uploads/files/lafijixipiwefazikamob.pdfIn PDF document text
    • https://defi128.phpascal.com/userfiles/files/pegewuzilekivopu.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/xaxemizajemaropufotepe.pdfIn PDF document text
    • https://isleo.com/i_photos/file/laloxebi.pdfIn PDF document text
    • https://artinterior.bg/userfiles/file/59537006259.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/56495266197.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/detelebekowexapofeke.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/60926403938.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/tofarugewote.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_off0000da1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1C 17308 bytes
SHA-256: 80016d37814b9308023f1474cefcfc3a56579cca40e8e056941fd5531a2f5ed8
font_01_sfnt_off000106c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C4 10700 bytes
SHA-256: 58004420b012802ac45ecbfdb1381dfa4b3ac32b8e71c90786f0fc2fad1e4ee0
font_02_sfnt_off00011f40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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