Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2f069048e4133b5…

MALICIOUS

PDF

84.5 KB Created: 2021-09-02 06:01:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 13656f40d875e9b23178ee9dbb82aeca SHA-1: 37301949ac87300bbdbac4a199ae38f218843a7e SHA-256: d2f069048e4133b58f7b3846ab7f2f18a24b140b4e76446f1f032cedf8e006a9
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many pointing to compromised websites or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and appears to be non-readable content, likely generated by wkhtmltopdf, further supporting the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://pistant.ru/uplcv?utm_term=but+your+body+is+telling+me+yes+lyrics PDF link annotation
    • https://spheresignal.com/app/webroot/userfiles/files/zobubutodepiliratafumufox.pdfIn PDF document text
    • http://turnyras.lt/Files/file/xifisopugadiduzi.pdfIn PDF document text
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/77044759599.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/43000940831.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b88bbf75190---fupetivitifipuvojo.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/69830860049.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/ca8e25addd61440b98a8ddb5e6efab33/69674857146.pdfIn PDF document text
    • http://ultrabeauty-ff.ru/userfiles/file/dubutenazamevogilutav.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d38216f91---7918194815.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/lanuvitox.pdfIn PDF document text
    • http://instalace-charvat.cz/userfiles/file/vigewelabulowugepefo.pdfIn PDF document text
    • http://benly-carson.com/product/files/8122040308.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607afbecd3b74---lajininisuzozas.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/28213198309.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/hoob602safqt0vo16etaotjsq5/zopirazabigiwewotovi.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/4459cb17783f6443dbbe227feb1dd6f3/35847911803.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/0881bcea92fb67e2ae8ab23d69c480d1/pedomov.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec5e677059---serogoj.pdfIn PDF document text
    • https://rcot.org/userfiles/file/93360342055.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/46192637292.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703d970a0e2---lotaxexokunejojefer.pdfIn PDF document text
    • https://dpmceramiche.it/file/bumuvoxorixepajeluzojejej.pdfIn PDF document text
    • http://ofipapel.org//ckfinder/userfiles/files/81264184219.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/weviwutawutizuguduv.pdfIn PDF document text
    • 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_off0000e564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE564 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD76 17392 bytes
SHA-256: 1a80679696c930e099b70302aa9e15758c3af8b7e0119bf29b401197c7e69a42
font_02_sfnt_off00012af4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF4 10960 bytes
SHA-256: bace272e40f0db31e7cf5d03ac44f2ee3d16c423d76fe3e169839f5920545df1

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