Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2c70c20479f5ff3…

MALICIOUS

PDF

74.7 KB Created: 2021-09-25 12:23:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 384e669b90b968494a3b6bb80935f3a8 SHA-1: 2bbf047460ca761de90a1f39dc15b2a91d59d4d8 SHA-256: e2c70c20479f5ff3dccc74ea42f1a7b8780d1e9c5225ea2b24b21c387cb5508e
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external URIs and is identified as a link farm, with many links pointing to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the overall structure and URL analysis point to a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://allytemp.ru/uplcv?utm_term=best+music+player+android+without+ads PDF link annotation
    • http://ssanadia.in/userfiles/file/80902058488.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/besibonaviw.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/24745471646.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613748dd05615---norudexuvebofufe.pdfIn PDF document text
    • https://suprastoc.ro/userfiles/file/dasutepuwimoveji.pdfIn PDF document text
    • http://phucuongplus.com/upload/files/66738439309.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/gebuve.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/8a7749bb42bb7cf40284cb3d7e66d8a4/nokevojelirufajukimofisir.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///rewunuxopitavom.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16137f54b0852a---21792691361.pdfIn PDF document text
    • https://sdudyogtechnologies.in/ckfinder/userfiles/files/14197540957.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/59153557692.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/1025285210.pdfIn PDF document text
    • http://gucaoyun.com/uploads/file/061458332369.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/90193791023.pdfIn PDF document text
    • https://ceiling.holcom.vn/webroot/img/files/lakurekoxalozuborupaver.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/38600652306.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614c29fb31862---tasalos.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/regopudujaxidilil.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/fetifepimemefuwikofaniz.pdfIn PDF document text
    • http://baharev76.ru/userfiles/file/73141755879.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/91660086653.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404afd45497---xagodederaw.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/10638764653.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_off0000bb88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB88 18228 bytes
SHA-256: 334bace6b8799f8a45c9f757f3b598602f119dd2ad639f5f6dd504da3c8912f7
font_01_sfnt_off0000ead1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E8 11132 bytes
SHA-256: 8200d67260af28cb10b78bb697ed1c72ed05efeb23665e1294bbbfb332207d9a