Malicious PDF — malware analysis report

Static analysis result for SHA-256 e12954e553c520db…

MALICIOUS

PDF

80.8 KB Created: 2021-09-02 12:45:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a6e65bf48b363eae0504549601ef9708 SHA-1: 30db5458cf94f202ef05074ef3f4d6ee59a32ae1 SHA-256: e12954e553c520db83ac3d9ba5270ef35eff8c70a7e7a4d1315321f553425009
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating embedded JavaScript and a link farm pointing to potentially compromised or disposable hosting. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to facilitate the download of a second-stage payload from one of the numerous URLs. The document body is heavily obfuscated and unreadable, but the overall structure and URL findings point to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • 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.
  • 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 http://sintellect.ru/Repository/file/dozemilekalizexesabufeb.pdf In PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f39154c0d7---najubira.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/78779082256.pdfIn PDF document text
    • https://kristaldicarlo.com/userfiles/file/39561385144.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/9657411403.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/40vtsfag8tpiv8keu7r7ktt7ju/wimeremiwax.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/xopizitesiduxinilukev.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/7674a766a369cabf7723dbeab937b571/25808504540.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/gccgvjfkphccr672q7pvrfofvq/41206994631.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/46775069485.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/37f1e5aff795166bc59238bc9539f613/77294254126.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/7k8d5nhok359a73p9i7o425p0j/nosuxiburadorumemit.pdfIn PDF document text
    • http://phucuongplus.com/upload/files/batofabipavonuwawu.pdfIn PDF document text
    • https://semut73.com/contents/files/32200138170.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/68747497653.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cf5180516bd---gisunagalikopi.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/3342822cc95c86c4c66303664c756ef1/xaren.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/0c6u3sa9ift8l2glvoq76uh319/68625822931.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/jaginelanoxudikenutafi.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/zuwilusalube.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/9848446222.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607966ef926aa---kuzevolivozedanabavaba.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/91687958829.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/supazakamopuwaran.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/segir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=singer+service+manual+free+downloadPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEE 16872 bytes
SHA-256: f88f55099de60e266bebbf2b81ea25842a4e42594d0550678ae70a8943a1f910
font_02_sfnt_off00011ba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA2 11048 bytes
SHA-256: 522eae602961dd534aebc160eb3802f62389126ca721c9c98190a0017ba80727

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