Malicious PDF — malware analysis report

Static analysis result for SHA-256 d356bec23fdf825e…

MALICIOUS

PDF

74.7 KB Created: 2021-09-06 15:15:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 72526be12816773bdb4cb737959b3d07 SHA-1: b59fa2375b4f194f9d691f2864928fe544ea3dd3 SHA-256: d356bec23fdf825e1bcab1beb910e7e92d4a4555bc95cf2dfe04501f01e189b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to potentially compromised websites or disposable hosting, a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.anjhimayath.com/upload/file/kobiw.pdf In PDF document text
    • http://brilsports.ro/userfiles/file///gugiri.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/14148147079.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/74406696674.pdfIn PDF document text
    • http://ig-einheitsloks.de/medien/file/97739110233.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c4281a1b0---rofajamonijilulolis.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/5boff0731c9qcgtoqsqn5af1lo/nodunafemomusowosagut.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed38482166---13995659454.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/73238a0a8361c70df30b8453adb267d5/75314133039.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/1f9cc314c814dbb98d2ac0286e23d33a/jivogiki.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a85acec83---50901519078.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/36217213759.pdfIn PDF document text
    • https://cuatudongbinhduong.net/uploads/files/75195314029.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210607212202146.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/37740967003.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/sojogoketolokudos.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/34973096170.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/sbg379dtmp5s3sslqn7c78js03/nuzevixowidaduri.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a1bee92f3d9---katamidozanizadap.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/muruvolisarapodiruw.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/42183163014.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=elna+sewing+machine+instruction+manualPDF 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_off0000c1f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1F4 16836 bytes
SHA-256: 84b60ec60e6f55d28e5815c6ec80be1531396b29c19e094bac41d98475a7d583
font_01_sfnt_off0000ebd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD5 10848 bytes
SHA-256: c28b86a0775c54d7cfe926b5d644b08a6f29e411a3f44c080c0d169ed387bc4f
font_02_sfnt_off000104be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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