Malicious PDF — malware analysis report

Static analysis result for SHA-256 d128438b252fdaae…

MALICIOUS

PDF

80.5 KB Created: 2021-09-10 02:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ada8993568247a97c320ba73dc04274e SHA-1: a8b97989fcea225cd1adfaadb8a51a868594c83e SHA-256: d128438b252fdaaeb9127b804f211e1cd307701b43c0eef9f0033fae398d73fc
164 Risk Score

Malware Insights

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

This PDF file is identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external PDF files hosted on compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a visual download button further supports a phishing or social engineering attack vector. While no scripts were explicitly extracted, the nature of the links and the ML detection suggest it may exploit PDF vulnerabilities or lead to further malicious downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://queure.ru/uplcv?utm_term=mi+browser+new+update PDF link annotation
    • http://inwama4.vn/webroot/img/files/22801655231.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/2jk2uodhftkvi9r13p5f6mo9uu/58074624086.pdfIn PDF document text
    • http://upnbkk.com/file_media/file_image/file/bobewipopujunozipatisatux.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/63aa3779880343697aacc468fce9d073/raxipagizezosa.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/44814544987.pdfIn PDF document text
    • http://exoticland.bg/upload/files/files/60875811455.pdfIn PDF document text
    • https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/95523003758.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/metilezetupujakuzod.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/161358aa97dd73---kimulolugimalojowusosuz.pdfIn PDF document text
    • https://euronuts2009.ge/files/files/migemuwazaked.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336c70416d5---tojezajobapuzemujatovo.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/xodeluziwupinoraxusejis.pdfIn PDF document text
    • http://wenyanchem.com/upload/files/87447364487.pdfIn PDF document text
    • http://coffee33.ru/archive/file/2490615344.pdfIn PDF document text
    • http://kenhuffbuilders.com/userfiles/file/mususujilafom.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/82698954759.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/32323161359.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/25352121952.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/15916947539.pdfIn PDF document text
    • http://hunting.kg/userfiles/file/vatudoko.pdfIn PDF document text
    • http://proleague.dk/userfiles/file/bupirujulidodefizujim.pdfIn PDF document text
    • https://jdsliquorlocker.com/nbloom/fckuploads/file/wowima.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_off0000d5ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5ED 17964 bytes
SHA-256: e9322b5b925fde88b612d7deffd0a0e4d5ea7bc45df19865be4185be51c106a8
font_01_sfnt_off0001040c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C23 10660 bytes
SHA-256: 910997b9840a8a069c4640acf4ef892bfb889ea83e93e277177aee0f63e8a308

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