Malicious PDF — malware analysis report

Static analysis result for SHA-256 da39d8edd552a43b…

MALICIOUS

PDF

89.0 KB Created: 2021-07-02 05:23:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: c3c051e230def5a0d00506cdcecda97e SHA-1: 604a321c325958f00720bc831402ef839d4a5725 SHA-256: da39d8edd552a43bdb1e094d268207ce4e8054e74d7d4a60adea3ec2b0331962
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous external links on potentially malicious domains supports the phishing and malware delivery attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • 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.
  • 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://babyindex.nl/images/uploads/32775922238.pdf In PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/99067484166.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160866a9ec5fcc---sorumokotanijixamo.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160717816dfe4c---69613972236.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/bfb835144f05f8c889ae95b949ba4837/92769730814.pdfIn PDF document text
    • http://talleresjpg.es/img/file/fafojexigud.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/55176250153.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f76d75e1e0---27387814760.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/o3cag6a9arvpv2to20iv3odmbj/49177049714.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jaluvofijifatetogujodulu.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084d4ff7f91a---dulenetonakezipabi.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790e55714b7---fobifugakonin.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/n2oalf9l142855m8otojiai6e6/87275233725.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160832c35ab807---zorabufemepobakobamo.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/5eaf986f7689aba0c5f5e63a2b7b765e/44137680467.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16095dac0569c9---rufujosadepiwoverogefifo.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/sakune.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/deb3d64fa557575470cfc980aa127a72/33333614680.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/55051662472.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/78398406c8cdfec10b541d3bbb7be2a1/77014207875.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087fe9543f9d---vebeme.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/ulctad0j3ib5fl8q534bdc1ho2/50835202655.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/0d7f92648f03655ab741e79c944ef52c/64697826857.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=luke+pasqualino+and+perrie+edwardsPDF 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_off0000f900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF900 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11117 10668 bytes
SHA-256: 3b80228887ea2972dc7ac558c607c8299ce742228ff26e77b3141c74ba55455c
font_02_sfnt_off00012975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12975 17268 bytes
SHA-256: 2d80ede46deb248b160f601a2b3569469dc25a161d652abeca64008ac11a3ccf

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