PDF malware analysis — malicious · 0a0a81bae17f840d

MALICIOUS

PDF

76.4 KB Created: 2021-09-19 07:16:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: bb24634bf91567dfe5aa63165536277f SHA-1: ddd91a7f978dcb15d456b23ac693fe2e0b5cf6a5 SHA-256: 0a0a81bae17f840dc87f1c8b1514fd72cb79e13b33dac98eaad192d4a7ae9554

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via a spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9943

Heuristics 6

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.
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://personnelstrategies.net/userfiles/file/vejutugibatesux.pdf In PDF document text
- https://ptkas.com/kingkong/userfiles/files/pidowu.pdfIn PDF document text
- https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613cac211c71b---7964831596.pdfIn PDF document text
- https://ermolino.mebel18.com/uploads/files/86612664887.pdfIn PDF document text
- http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/89981854918.pdfIn PDF document text
- https://franciscojaviermoreno.com/DocsCKeditor/files/36478244802.pdfIn PDF document text
- https://kapokcmassage.com/uploads/files/202109022110585264.pdfIn PDF document text
- https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146a7f049175---48923612770.pdfIn PDF document text
- http://chupanhnoithat.vn/upload/files/72241968595.pdfIn PDF document text
- http://dytac.hk/userfiles/nikusofafefudosegunixivad.pdfIn PDF document text
- http://zulassungsdienst4you.de/bilder/file/sirumuvesakalepisen.pdfIn PDF document text
- http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/35506218991.pdfIn PDF document text
- http://cy2hand.com/userfiles/82929940937.pdfIn PDF document text
- http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/wesibaboderiz.pdfIn PDF document text
- http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa8f1153ac---tawulasuboni.pdfIn PDF document text
- http://fthyhs.com/resource/docContentImg/file/2021-09-12/d855014d8f0dc35154f0be4b100408bf.pdfIn PDF document text
- http://fulepmark.hu/nyebu/fulepmark/userfiles/file/64740542832.pdfIn PDF document text
- https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6654f32a9---ramawagusasoreme.pdfIn PDF document text
- http://luxlustry.ru/img/upload/37166768346.pdfIn PDF document text
- https://unicon-msk.ru/data/files/digimukowuta.pdfIn PDF document text
- https://incense888.com/uploads/files/202109010611304639.pdfIn PDF document text
- http://3qlohas.com/CKEdit/upload/files/ridazewasip.pdfIn PDF document text
- https://associazionebriciole.it/public/file/xasatutusetoloxoxu.pdfIn PDF document text
- http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/84590128013.pdfIn PDF document text
- https://hebatkeren88.com/contents/files/naxupevakajafalolisuf.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=genshin+impact+live+wallpaper+downloadPDF 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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000c339.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC339	18124 bytes
SHA-256: `717012cadac15307750b5e80a277730a55bd91c2cc7dc635602b62b140df1084`
`font_01_sfnt_off0000f2d5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF2D5	10968 bytes
SHA-256: `3bbb79be86ecff49d70a2f577dbf807ccd0e2cd91b8c450ee8d6ce9f40d8be73`
`font_02_sfnt_off00010c2d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10C2D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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