Malicious PDF — malware analysis report

Static analysis result for SHA-256 c27b96b944673e07…

MALICIOUS

PDF

68.4 KB Created: 2021-09-14 05:11:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ce5d72d089573fc9890550491ce130c4 SHA-1: c418cc92d0b112b1e40506c8578f8186591dac42 SHA-256: c27b96b944673e07db2b30a6d57d38370091d82024ff580b608fc5955f01ccc7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to various external URLs, some hosted on compromised CMS platforms. The presence of embedded URLs and the overall structure suggest the document is designed to redirect users to potentially malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://philabc.ru/uplcv?utm_term=fs+14+new+version+mod+apk PDF link annotation
    • http://sciattella.net/images/file/tuxelof.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133292ad576f---74298739799.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/64081731814.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/wukiroxawugu.pdfIn PDF document text
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81897989206.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/62277888950.pdfIn PDF document text
    • http://cabanagarden.hu/editor_up/lakewinatikosofu.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/67538516993.pdfIn PDF document text
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/jumuwojol.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/50940422044.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/6477470223.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/39613275922.pdfIn PDF document text
    • http://syntrend.critical.tw/upload/files/29023748248.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/bewodavuruzulod.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/jetuvagibaxogerodet.pdfIn PDF document text
    • http://haki.vn/uploads/files/42061696015.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/77150489364.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/20943807817.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/68207734020.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/xatulosabeku.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/6da6e6dc1ac45c38895e1dcce8628bcf/xatajevuvemekid.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/161358ebc90623---33316162714.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_off0000acfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACFE 10760 bytes
SHA-256: 610032cbf70d8b4a036caa7692b0848a1b2de97b70be2810009866627c2d3193
font_01_sfnt_off0000c5d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dde8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE8 15208 bytes
SHA-256: c3fe426c099334956bf4e40a5bd1ab19e8957fa2b80003e6e6da525412e2b8ee