Malicious PDF — malware analysis report

Static analysis result for SHA-256 541c211d97e9d60c…

MALICIOUS

PDF

78.5 KB Created: 2021-09-01 11:51:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6c9898cc1e33baa0bf0ccb058e4a1a6b SHA-1: 4382b9c11e4196f37cb8ea95ec4b8d3c7015b110 SHA-256: 541c211d97e9d60caf2e7ccdda263ddc37c99bb932d292d707e6e90805113ce5
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. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised CMS platforms or disposable domains. The PDF structure and embedded URLs suggest an attempt to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://agendatourvietnam.com/hinhanh/file/15098092661.pdf
    • https://matharu.ae/userfiles/file/sonowuvusetaf.pdf
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9a71474ec---97399253509.pdf
    • https://santechnikosdarbai.lt/images/files/rawukojivipebemobaninimo.pdf
    • http://huonglonghotel.com/uploads/image/files/71579622540.pdf
    • http://matchonusa.com/uploads/files/gijupexuvupudup.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5d5b5f7aa---ziwazodatopebisuvizogub.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16095e9f830113---xopajovavawikat.pdf
    • https://gsacademy.ge/uploads/files/pamare.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cd9b78679---63645866036.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca78b26078---vatajurifuko.pdf
    • https://lotte-ppta.com/beta/assets/file/vizamorafigekasetapake.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd406b009a7---39648808537.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac71ea81e1---27839401548.pdf
    • https://kodcomputers.ro/2664/uploads/89694392518.pdf
    • https://serviceservice.eu/userfiles/file/96785760118.pdf
    • http://laiyi-art.com/userfiles/file/90225747998.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4ed7eda88---duwiri.pdf
    • https://kurek-rowery.pl/user_pict/file/nijikotarog.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/7b0b92ff9ea2f1ddb3b3ba0b4f7a5e5a/54941967089.pdf
    • http://extracam.es/app/webroot/arxius/file/34044275764.pdf
    • https://gkscam.com/userfiles/file/lizixinejaxuxanivupigilu.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/2cd30b85d2952d3149d5afbfb777bbf7/68528549896.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=contact+widget+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfd4.bin
c3f51e5c9fc34e9ad9010c8654f467ccc1b8106bbf6c38685262a2a4d31e7afa
pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD4 10448 bytes
font_01_sfnt_off0000e78f.bin
224869fc771f65efd766aa488f43d95dbd549efb5154a8ab1c1b3c53380c8e71
pdf-font-stream PDF embedded font (sfnt) at offset 0xE78F 16864 bytes
font_02_sfnt_off00011353.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11353 16792 bytes