Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b052e10ead3f902…

MALICIOUS

PDF

86.4 KB Created: 2021-07-06 12:43:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 64499dc2ee3f144ae8c254a0d7d98681 SHA-1: b6cbabc288dd541dfb287da54aa13f7327535faa SHA-256: 3b052e10ead3f902053fb356956a36d3175419a4be2dfbe6d28257f318ef45b8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the presence of external links and the nature of the heuristics point towards a common PDF-based attack pattern that often involves embedded JavaScript or exploits to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4cd5cd81a---govumumabenutozibomota.pdf In PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160725192bb86c---liwawitekadil.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/50605626158.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/2e2d42fbcc8507f5802fbcb0c698e2e1/52857716467.pdfIn PDF document text
    • http://mousike.it/img_ins/files/86793252343.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/314d2f95b4c218b47382437c6b76ff77/jabofedugukexojiseso.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/jmqprr4mfsngsms4dsda0961e1/30314775895.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608127dcdfe98---bewetakugogalad.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/16774871516.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/36305511610.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/tlcsk13ekh3311kk1nf6mpbg55/43202792127.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/bs9035iftimesasdch449aj6l9/mabarefotugan.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/f8be29b85bfbbd34639ff65cf243ddd7/nibonib.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160896d3b4df52---35161789455.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/4e519a5b891e78a4a020697b935ce2ab/4516012904.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/pomubajomuzur.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f784e68d08---kikesodunonizevis.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/1984afa8f84bf008ea1deb0dddbbc70a/91546052411.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/gugapoda.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/zukaxalu.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/d2d915218f2f8476ceb013e5e35c4651/zeduxewesifetufaduvutibi.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/9205c3cf74601262104f26ff287877cd.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/zubuj.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/739vl68tukk03to284soc74cj3/43178525206.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=kgf+to+lbsPDF 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_off0000efcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCD 9932 bytes
SHA-256: b466eb0a73b38e6d30b516be787dae1ee009cc2bc93ed6788f36f26d17245464
font_01_sfnt_off000105de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DE 18008 bytes
SHA-256: 24e399cf702bc290198ee53780c933fcad7a0dfe89dd62b6b95ed2e118a4593c
font_02_sfnt_off000134bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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