Malicious PDF — malware analysis report

Static analysis result for SHA-256 bea6a1782c2c3814…

MALICIOUS

PDF

69.6 KB Created: 2021-09-16 16:32:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 57078a751ea72170e5c44cbef694ddfe SHA-1: 1366b84522d7fcf808013619c54ae7d7370fc1f1 SHA-256: bea6a1782c2c38146c7e55be2b60649cea00594747afa24bdf088c50604d19f3
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple unknown PDF files hosted on various domains, some of which are identified as compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, but the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://onlineadda.organicemall.com/ckfinder/userfiles/files/31052800511.pdf In PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/badopafakadutevopijaru.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/55718189319.pdfIn PDF document text
    • http://stagegator.scorchmark.com/stagegator/ckfinder/userfiles/files/dexukakasoj.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7634eac140f5e0d68328c6ac3cc4fc16/4281229387.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16142c3ad49a27---lowinire.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/muxigalobiwogalosemubutel.pdfIn PDF document text
    • https://tomas-music.com/contents/files/58262848567.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/babeduz.pdfIn PDF document text
    • http://www.rajpuc.pl/pics/file/xebubazezozexafised.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/woseguwuzod.pdfIn PDF document text
    • http://proleague.dk/userfiles/file/dozidixijumugexomojajase.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130fadb816e1---40956205896.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614056eeefbb6---69461462655.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f6d2d18a5---nikusazebebiruwadagutasuv.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c212bc8702---25523433566.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/bukakemode.pdfIn PDF document text
    • http://yuilchem.com/userData/board/file/kuvofe.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/mitokafazobig.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/09/04/vaguribesubogirofi.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/kaguxiripegibuvi.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/xawigisuwopuwewepafezagaj.pdfIn PDF document text
    • https://kvizek.hu/ckfinder/userfiles/files/5518668629.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/76481346204.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/44996769227.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=link+download+aplikasi+androidPDF 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_off0000b5ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5CA 10292 bytes
SHA-256: a3f8bb4d04a8d4c3f22ec9802ff0461c91ab45d43a71c008cf7bd58c30c8d4ee
font_01_sfnt_off0000cd02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD02 14220 bytes
SHA-256: a8656c068ab8c381dcc8176a449936321fe031ebfeedc9f79b9fa11b4f1e0415
font_02_sfnt_off0000f085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF085 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1