Malicious PDF — malware analysis report

Static analysis result for SHA-256 55a6959917cdf262…

MALICIOUS

PDF

90.5 KB Created: 2021-07-29 11:51:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: dc083d737e6b97f9e68eec19da8955fd SHA-1: 992ba41c63c13163c69799ff7a9e69a84e3380d6 SHA-256: 55a6959917cdf262905aa796b03c3e219d99656038b3de821a7444a485cc8261
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, hosting numerous links to PDF files on compromised WordPress sites, likely to distribute malware or facilitate phishing. The presence of external URIs and link farms on potentially compromised CMS uploads suggests a tactic to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/u7dsal6q4tbj0jeni5e253btp0/42588264686.pdf In PDF document text
    • http://otoozevran.com/resimler/files/25357720347.pdfIn PDF document text
    • http://tvcsoltau.de/userfiles/file/85649733158.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/b6fe0972b766ffd9c4330853fad5017f/vojavigenezepal.pdfIn PDF document text
    • https://energooptima.hu/upload/File/23860627142.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf701930a1---pikukufejuxon.pdfIn PDF document text
    • http://phs60sand70sdecadesreunion.com/clients/880504/File/tapeninuselotopoduwole.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/72349321864.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210714010152823.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607770e5e1e8b---3655478381.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160905a3127894---lorozegivo.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/q1uuhaqs5fp6oa74q56alg322o/mijivoziw.pdfIn PDF document text
    • https://akita-inu.lv/www/files/files/37664587271.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-7-6/20210706072401961686.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/a383cacf2b1079f9b993fd50e6e29dfd/migovijim.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b9cfb7401c2---vezeti.pdfIn PDF document text
    • https://duvarkagidierzincan.com/userfiles/file/2613561045.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093e76ad88ee---newiwowisajimom.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160931884f02b4---85094548435.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/htnb3vkv2bbiffknu1bgdo96kj/38170416569.pdfIn PDF document text
    • https://majubesar.org/contents//files/62938289109.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/78977612134.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/839b24d5aedabf6d3e0981a51224fcab/86387647711.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa5d4260aa---55216287.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=amazing+tales+rpg+pdf+download+freePDF 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_off0000fce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE1 17440 bytes
SHA-256: 48ed38a017cd3ad56b39637c7a2b6f85db7a70a278f00d2c041b203a8e753635
font_01_sfnt_off00012a8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A8C 10968 bytes
SHA-256: 93a4ebf5019bee703df7a2c3eda83dc1ae47e6f828ac0a6fc158bcd8d7e8a182
font_02_sfnt_off000143e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1