Malicious PDF — malware analysis report

Static analysis result for SHA-256 d04bb8267a01cf10…

MALICIOUS

PDF

70.3 KB Created: 2021-09-24 20:38:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f26b8f2b7fec7720b74c0ffb9ef39002 SHA-1: 9d857f2bc0786c8be686620132574feea2eef684 SHA-256: d04bb8267a01cf10294030b8162b42efbe1ee7205d8ce7acb5c6cd75920549a2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://allytemp.ru/uplcv?utm_term=how+to+create+raw+folder+in+android+studio PDF link annotation
    • http://travelsi.ru/ckfinder/userfiles/files/6902454193.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/62988080382.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/37001040800.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613747b390bc0---vobaxotubomekazamerere.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/73555436879.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210919_27A378DD403A2855.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/ketisumojakefozab.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/83096547323.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/45763472569.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/batifujavemutikopulo.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/pakoz.pdfIn PDF document text
    • http://romovi.net/sgi_userfiles/userfiles/files/75288573.pdfIn PDF document text
    • http://efeotokiralama.com/Upload/file/54786793176.pdfIn PDF document text
    • http://czyxchem.com/upload/files/tutagovamofidisezaximuxuf.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/1d1b1d81b3fd1e9c6d45562bf4395a22/75954308734.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/01bd7e97f7f53c8edd03dab03d885746/55732900791.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a7be2bd9d---ritusenotowowuxupuki.pdfIn PDF document text
    • http://simsvizag.com/contentimages/file/zefetexezokapewudip.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/fabovure.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/19161928251.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/xarujubomorawozuk.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/4c00ab456de2bbc8e1400160c96e1d83/bosijorireza.pdfIn PDF document text
    • https://lean-ds.com/upload/editor/file/40899767830.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/8753665258.pdfIn PDF document text
    • https://kfmaccounting.com/webroot/img/content/files/1547234645.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/delasir.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_off0000b4d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4D8 14892 bytes
SHA-256: 152b07a9944b5ab3b86cba6e6967f66e454cd58d9470626e627f16e4f1fc83fe
font_01_sfnt_off0000da03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f21a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21A 10644 bytes
SHA-256: cdf7378645f11df142bc90925ef91fb226f5bf16a0fec18be8e628a014248054