Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f6a973c4c634ab1…

MALICIOUS

PDF

96.3 KB Created: 2021-06-17 04:55:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d6872c217debe29f27d67f15a54781aa SHA-1: ec33c86fd110c5c259f535647d4227c298246751 SHA-256: 6f6a973c4c634ab16e9d6e4a96722d93f1e185e5ff7721b1d8299eef0934d97b
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://wastran.ru/uplcv?utm_term=hd+mp3+songs+free+download+for+mobile PDF link annotation
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a8fc414b9a9---gawipoxajefuwoz.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/ujkgmq8hnsqg0pkk69vrjq92sj/melasebuw.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/10850037891.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/dn994rto0hf9ipa9pch67g90i0/falaxuxedezivatiba.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/xikaganisuxeviwufezob.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/95p9a6pcvoe5r07l2a37u1urum/xiforowezik.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c04b90e8e33---dilediwokedax.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/nesifojelutonov.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608675c4aad38---foloxodijivumujig.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/sosoviku.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/lobuvivo.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f06386e3c---wupezifi.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/n1jpcq0mldlnbgm3lcdfeq8fg7/4471369190.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/50328394401.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/1e66aa1a13830b2c01c0b5e71b766e65/zafitetokagovovisobowu.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc8271038e---16070201830.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/c5uabh466a6o2ju63ooffovs8d/98378149662.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF725 6656 bytes
SHA-256: ddebf461d9343d02325567dfac06ee035c710044b35897afbeaa1fba24900471
font_01_sfnt_off000107d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D7 5424 bytes
SHA-256: 6cc1dee47e0856961247ba14dd1a3ddb0cf62f9455e184f7b207154171b2f679
font_02_sfnt_off00011a2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2D 3712 bytes
SHA-256: addd2bce38be1486dd63bdea7a08db7ed9fa3a2a607d29341df60e1ca4c83e6f
font_03_sfnt_off000128d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D5 11204 bytes
SHA-256: 3839a307a146094c572353471ca99ab13d797a4544cfece4358e1ee460d1aabf
font_04_sfnt_off00014f5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F5A 16168 bytes
SHA-256: bcfecb9fde4b74e4a2b692e15caf305b2988a1cfe4c6386614002e38d35feb86
font_05_sfnt_off00016460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16460 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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