Malicious PDF — malware analysis report

Static analysis result for SHA-256 f56804136c670daf…

MALICIOUS

PDF

83.3 KB Created: 2021-10-09 06:26:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d60c8243c9415ccadacee2346f8d0278 SHA-1: 5d4eed336b3fd6dd993af48e9debecb9335012f2 SHA-256: f56804136c670daf9d212f93ca6bebdfe34a6005fbe50a2db6d88c43285840f3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. ClamAV and ML classifiers strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple compromised or disposable domains suggests an attempt to evade detection and distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140ea79d6495---98378232628.pdf In PDF document text
    • http://codienlanhtrangia.com/Images_upload/files/21130010411.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/gobukerutoro.pdfIn PDF document text
    • http://sns.hu/_user/file/90380173444.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144eb344cf18---mewunawom.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/76238199650.pdfIn PDF document text
    • http://uni-soar.com/userfiles/file/botovixobamokal.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/nobepogokipogasesako.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/82701765776.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/belalorepokoxanaruk.pdfIn PDF document text
    • https://parc-hotel.info/file/24989776435.pdfIn PDF document text
    • http://gazetavk.ru/img/file/natil.pdfIn PDF document text
    • https://gogift-it.com/userfiles/files/wiguz.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16159a6f7a0cfa---mizedozodaxotomerenuxe.pdfIn PDF document text
    • http://stickerbarcode.com/file_media/file_image/file/65955111940.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/220039944.pdfIn PDF document text
    • http://autolubitel-irk.ru/userfiles/file/pawamer.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/zosijolurepuzebosujowo.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/pedodutodimivukosi.pdfIn PDF document text
    • http://originalavto.ru/userfiles/file/fasonemezilu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=in+love+and+troublePDF 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_off0000e1f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA08 10240 bytes
SHA-256: eb1fb4c0f04b062da5c9c16dfeade541b8bade37ea4dc47dc77335596cdd722b
font_02_sfnt_off00011120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11120 18028 bytes
SHA-256: f43fd3691cf99c994c1712a7d8ab30bac5d1aa15785dea1ef8d6dcf4e33849b8