Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7581305651fe408…

MALICIOUS

PDF

84.9 KB Created: 2021-08-23 19:05:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cfd4014b4f339bb7426e0383ab176876 SHA-1: 9d8730ff81539630ca86de9d5f0b35daa1456010 SHA-256: b7581305651fe40813db3dd40de838266bf03086846c4204636f449cf457936c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with numerous URLs, many pointing to compromised CMS upload storage or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple external URIs and link farm heuristics points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://gloucesterclassof81.com/clients/23558/File/tufotiloxuti.pdf In PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8fdf92ef1---nutune.pdfIn PDF document text
    • http://xsteelstock.com/d/files/81076058887.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/da4db5166d522e1a2a3fe7fd4560731c/23828042533.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/10463069934.pdfIn PDF document text
    • http://minerva-collection.net/files/files/89034709182.pdfIn PDF document text
    • https://businesslife.com/content/files/sepemodevevitelogemo.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3c69b9da8---luwabomarixeguwebofof.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/29178590418.pdfIn PDF document text
    • http://pnlestari.com/visitbali/image/files/ruxesebijorap.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/7808100850.pdfIn PDF document text
    • https://giustofiori.it/file/98862167031.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/22511142216.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/pimulivipilaba.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/29420977730.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809a752e6af---negegopulekavisunez.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071394b87b0b---13509056964.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609204a44139b---xuvebobeki.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/vamadaminog.pdfIn PDF document text
    • https://defi128.phpascal.com/userfiles/files/44112853011.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/58df59a364a8027f3f6bb2864ae766f1/lidalimog.pdfIn PDF document text
    • http://whipitleather.com/userfiles/file/22537768834.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffc4d85bf8---27236717910.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/2058744277.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c50abf1d10d---manisamerulipazujubo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=confectioneries+near+mePDF 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_off0000e70e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70E 10484 bytes
SHA-256: c59c6fb6f1dcb34506706467be05d4b0dc158ba82806a96d916716fe9d966a64
font_01_sfnt_off0000fef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11704 17588 bytes
SHA-256: aa2defb1d11becc08022c9c2849a2e1ea8749b85a2ae7d54c4e923b7d4b8b96e