Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8a5775af132a4bc…

MALICIOUS

PDF

81.4 KB Created: 2021-09-01 18:24:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 035e11927c2b4b843d190a8e08f7979b SHA-1: 64c552a6f4181ce0e6c62211475c52fd2b244721 SHA-256: f8a5775af132a4bcb94beb64bc703e32651db8e899480d64a0919c6cfdc795ea
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs likely lead to further stages of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://garglob.ru/uplcv?utm_term=approach+to+learning+skills PDF link annotation
    • https://rhodium.vn/uploads/news_file/93679176356.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/rurilizobin.pdfIn PDF document text
    • http://rcsiprojectracker.com/userfiles/files/64052469970.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/nafemudimuzer.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/70272041109.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/93882468281.pdfIn PDF document text
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/90295827925.pdfIn PDF document text
    • http://sivam.pl/files/file/bilupojudokefi.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096729216976---87034256195.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb0857642c---60223036488.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/616cc1682d63ba830f614ba6b0d8e842/7944425962.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/49532372394.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160850e2bacd9f---dakasuxanifojeruserad.pdfIn PDF document text
    • http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/raxoxivenigaparemumugaveg.pdfIn PDF document text
    • http://vikingpaint.com/user_file/file/15926040994.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/aqmp7k6uo2f9jiifdp8k247364/96250631616.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/mupumibevipopafup.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612b2a0208fd1---bopofapakixef.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/85338257607.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/miki4kf4743vbi3omf555dua64/vuxigivuzapewarike.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bece73d1ab---8499771108.pdfIn PDF document text
    • http://lynhuagiasi.com/Images_upload/files/97972205999.pdfIn PDF document text
    • http://93564497.com/userfiles/fokutu.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/r7vdnqrgor54qncr9v3vor8l3a/43902035590.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/29777087298.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_off0000d8ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EC 18260 bytes
SHA-256: 4c6eb7564fdcee48cf29ed64909a56ef4c6ba04972d5d17a41c9c321176ad262
font_01_sfnt_off00010710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10710 10724 bytes
SHA-256: 39ec1f2b4da50a44a8d602f444274d2efa60d59d1177811e4463e4a2c770ce8c
font_02_sfnt_off00011fb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.