Malicious PDF — malware analysis report

Static analysis result for SHA-256 a045d25b0374ebf3…

MALICIOUS

PDF

85.9 KB Created: 2021-09-18 17:34:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: af709e49905c7c0b058762699ae8cea5 SHA-1: 8a6e992efcc01589bdfd45577a648ff8d1b12d58 SHA-256: a045d25b0374ebf381e38bf2ae981effb1301af2e1fc9dbfe82f67ead2f51bb1
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://hoteldanang.com/uploads/images/files/zumule.pdf In PDF document text
    • http://soyaksiesta3.com/userfiles/file/jififusupax.pdfIn PDF document text
    • http://llux.vn/uploads/files/nutabowisekedirapudiseti.pdfIn PDF document text
    • http://blccy.com/userfiles/files/totap.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/gebosaruzuxikuwumuxusope.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/jesamujaxuwe.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/161340a455d011---jirametabuvelep.pdfIn PDF document text
    • http://abpjseah.news-read.com/upload/files/jefidiratinuliri.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/2363238a119293899d1c5d9414a55d82/leramozifetisujezosito.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/7cee1595748fcac9979938a93b1d3d74/nujikudojakefovalenida.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/161406717e794e---63646632463.pdfIn PDF document text
    • https://ijpdua.com/contents/files/29465870008.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/96979997933.pdfIn PDF document text
    • http://stromzeleny.cz/file/90221866587.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/pijovezamekarovovozel.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/29173264362.pdfIn PDF document text
    • http://sinching.com/uploadpic/files/202109112159361439.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/dotadekux.pdfIn PDF document text
    • http://neboskreb-irk.ru/uploads/userfiles/files/telenukezuxivuwulugaduwij.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/16734318150.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/29635420202.pdfIn PDF document text
    • https://safecampus.in/cmsCart/upload/file/7898898406.pdfIn PDF document text
    • http://creativecoms.net/userfiles/file/77659973920.pdfIn PDF document text
    • http://cdjuchuan.com/upload/files/18758129037.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/a8492aec3a7f57daaa8ec64b85a263ad/28575733724.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=measurement+app+androidPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ede4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE4 10600 bytes
SHA-256: 6d2f016f03b45fed42c770ab820cc8f79d78d237063d3f3d2c449a60d13792d8
font_01_sfnt_off00010614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10614 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E26 17180 bytes
SHA-256: 21e719c2c0d32a5e120aea932934cd30932840b05a4f4ef353ab2d2dc4c06357

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