Malicious PDF — malware analysis report

Static analysis result for SHA-256 f672a848edcd1585…

MALICIOUS

PDF

71.1 KB Created: 2021-09-27 15:55:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d7a1440cca0ef680447e17ea428e06fe SHA-1: 997f585ea4849f5c6cb229eb527814a7fb2db6ab SHA-256: f672a848edcd1585c349072aea6fe4c755fdc15213bfe6d8fbb718cb1d06d1ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. Heuristic analysis revealed it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The embedded URLs, such as the one pointing to compromised WordPress upload storage, indicate an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://webmenuplus.com/images/file/25988325272.pdf In PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/zawaxumulexuwido.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/7b6c9e406a7579006ec7fbd1b8e4fd11/82577902767.pdfIn PDF document text
    • http://lyzph.com/userfiles/file/Fl202109242110011467.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/tabuvapugo.pdfIn PDF document text
    • http://festacreativita.org/userfiles/file/16762851795.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/zajepenavuleremavozazeg.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/97222747911.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/29529039433.pdfIn PDF document text
    • http://aallergy.friend-match.com/upload/files/89990904184.pdfIn PDF document text
    • https://ltes2.tw-goods.com/UserFiles/files/towaladagoxotepajolug.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/82712643598.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9d14d0a25---betutubur.pdfIn PDF document text
    • https://gopherscopes.com/userfiles/file/fidej.pdfIn PDF document text
    • http://rjt1.org/upload/files/44097874523.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109140811198794.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wakivowinutevedexipo.pdfIn PDF document text
    • http://fitviewer.info/files/file/90576072270.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161478f0384259---3293364640.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/vogerisedumisez.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143ed4cbc0d1---90929609632.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/41711410744.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/e8fc2efbf30681e8e436e2c5dad84463/riganedumidazusukamavan.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/88270697872.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/45071748588.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=pnb+net+banking+android+appPDF 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_off0000b312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB312 10584 bytes
SHA-256: 0f8a9a26eefb44e0c28076156a3892391bc2e157371627634e5ee4931ea968ff
font_01_sfnt_off0000cae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE6 16680 bytes
SHA-256: 2ed10cc353b6d1efd77ba39ddf2878d1d915907494058d0fd7b3b0f44d88347b
font_02_sfnt_off0000f516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF516 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1