Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd7f39e19f685809…

MALICIOUS

PDF

88.6 KB Created: 2021-09-17 07:11:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 05eeaa101000187077d1a898baed4a0a SHA-1: c7805d718593fadf4dadb9d310f3a3f2f4d4d13c SHA-256: bd7f39e19f6858094cc7d139cfc836a0bcbb2497afdef0df7334060745201623
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. Additionally, the document features a link farm with numerous URLs, many pointing to other PDF files hosted on potentially compromised or disposable domains, suggesting a phishing or malware distribution scheme. The presence of embedded JavaScript indicates an attempt to execute code, likely to download further payloads or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://irlanc.ru/uplcv?utm_term=samsung+s10+disassembly PDF link annotation
    • https://suma.ca/upload/editor/file/81438734280.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210906140109.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/jubovusibaxez.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210907_2B2FD3AE11907D42.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/79636673933.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/nazudasejib.pdfIn PDF document text
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/99382586922.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/feradepirinulagumosake.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/21249077130.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/10924486472.pdfIn PDF document text
    • http://kelkenaghshband.com/app/webroot/img/files/reduwarelidogekatelufob.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/pboovjvr99s916h9p8drnl6jo3/nanofetipiji.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/508e1348252d041d72cd23f193979e34/34239612635.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/b67c493f957c4c5f99e50ccc864d38bf/64378106903.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20210901223617.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/74761751112.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/95545237787.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16143ebcfecfc0---nesel.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/moritatepedolobe.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/54246913222.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1631634122.pdfIn PDF document text
    • https://granitabrasive.com/editor_up/tegavigewuramujox.pdfIn PDF document text
    • http://quranday.org/userfiles/file/wituwakavuj.pdfIn PDF document text
    • http://www.mousumibanerjee.com/fckimages/file/fegisom.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/lofisigoxivunakevujanapu.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_off0000f301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF301 10876 bytes
SHA-256: d8f102d12e083572cb1529bfe2fb030b217c4c02c2fbd9cdcbae6daab2c83f1a
font_01_sfnt_off00010be8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE8 18592 bytes
SHA-256: 8d324bc9670f19e4de0ab65d1d42cc2e3c46dc52fc4abd7a2eb2a94f93e1117e
font_02_sfnt_off00013c65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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