Malicious PDF — malware analysis report

Static analysis result for SHA-256 13ed623a7ea09661…

MALICIOUS

PDF

87.9 KB Created: 2021-09-14 09:13:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c60a3f90e3b813ca70f4eb6229bf634a SHA-1: 1aa270ce4f0aeda355903191cc4ec2ec6e774a42 SHA-256: 13ed623a7ea09661910a336d002ff5df3177a08aff49c6df7ece28d2762e9dc7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. It contains embedded JavaScript and numerous links, many of which point to compromised websites or disposable hosting, indicating a phishing or redirection attempt. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://www.elmundodelapiscina.com/ckfinder/userfiles/files/35805610226.pdf In PDF document text
    • http://autoscuolavalerio.it/userfiles/files/maviw.pdfIn PDF document text
    • http://fcgo.tw/uploadpic/files/pojamirixanoroder.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16138df557bd6a---36558511060.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/fadff3ce497d806e8c53421cfa406776/45662935024.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/bb919c7fa300136238ba7a9a0c67b690/83067608293.pdfIn PDF document text
    • https://vespaclubcagliari.com/userfiles/file/3433527097.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/wofor.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/luvimeriz.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/zimukom.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/09/202109062347206848.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/22706803448.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/2334553676.pdfIn PDF document text
    • http://uteambio.com/upload/files/rizirovokevedimalolo.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/70337581825.pdfIn PDF document text
    • http://321eastern-thailand.com/userfiles/files/81582834432.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/43097909090.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16139d9a43d60e---76503214044.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/63145733672.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/6eea0039d64bd19a686c2adcebb6e241/40610960085.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/zedutepiwolijazufoxegema.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/9674867052.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/soxudakebudowujikugeza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=gacha+club+apk+level+5PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000cfe1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xCFE1 16716 bytes
SHA-256: 2fa44e400644fb05d1d2ea7c30e71c8b38f13fc4493f55313e86713f751d5945
font_01_sfnt_off0000e7c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C1 22900 bytes
SHA-256: f578be41e6703afe6a6aa7dffd71a557aa6c742ebb37f4b2cbba0de0dc9ac035
font_02_sfnt_off0001204b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1204B 10360 bytes
SHA-256: f0f6c49320294d1fb26fd24617f97ac86fe5c6902489c7bd4b5e63eb3ba2accb
font_03_sfnt_off000137a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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