PDF malware analysis — malicious · 7f72c2363fac39a1

MALICIOUS

PDF

85.8 KB Created: 2021-09-06 21:46:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: e459852fa1401318d1933abd5cb70b25 SHA-1: 1f351d4dd2ad73d05a9146c080f643fa52197a6a SHA-256: 7f72c2363fac39a19ec4e54d421fb02afaa694dc8e5fd8f5c20de387893285df

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9819

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://pistant.ru/uplcv?utm_term=2018+kpss+benim+hocam+tarih+%C3%A7%C3%B6z%C3%BCml%C3%BC+soru+bankas%C4%B1+pdf+indir PDF link annotation
- https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/97114142d6f28e1064ea47b478a8a5d9/pigakor.pdfIn PDF document text
- https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/f2e327e6ad7f25db5d543f90b91aebeb/kevusiwopaw.pdfIn PDF document text
- http://niezapominajkowo.eu/userfiles/file/6024038475.pdfIn PDF document text
- http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b86c09327db---89726954105.pdfIn PDF document text
- https://namhunglogistic.vn/site/files/233366024.pdfIn PDF document text
- https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/88c68cf9a37f4f5ee2d9d8fd4ae66a0a/88640106626.pdfIn PDF document text
- https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160847bd65ff1e---kefewiluwiruxadumopux.pdfIn PDF document text
- https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c3dc8992b---25020568018.pdfIn PDF document text
- http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606fec4997d74---37157126056.pdfIn PDF document text
- https://dursunguney.com/userfiles/files/13519230004.pdfIn PDF document text
- https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c5769a07a---sorifuboniduw.pdfIn PDF document text
- https://lapakunited.com/contents/files/ravijadukebuz.pdfIn PDF document text
- http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608193e43bb69---95569230839.pdfIn PDF document text
- http://jaika.in/images/documents/files/rolejutevagenobamakusiru.pdfIn PDF document text
- http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160824d7960529---debukunowitilel.pdfIn PDF document text
- https://parc-hotel.info/file/zidavupoporedal.pdfIn PDF document text
- http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc0f2e5a51---37164585263.pdfIn PDF document text
- https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/92efb380f74039948f15e1968c7aaebf/83907899214.pdfIn PDF document text
- http://prospekt-rostov.ru/ckfinder/userfiles/files/zidomanivuwanip.pdfIn PDF document text
- https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/rdis45i37avuid7cegbv11e42h/denavevosafazuxagekafo.pdfIn PDF document text
- http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d38f9eb572f---dulos.pdfIn PDF document text
- https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611638527904b---2148189753.pdfIn PDF document text
- http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9eabb7690---tivujizalelubegopuxim.pdfIn PDF document text
- http://zulassungsdienst4you.de/bilder/file/xanolokezurapamori.pdfIn PDF document text
- https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/a3c05236f444f3586fc7d18990d13e03/59534543139.pdfIn PDF document text
- http://studiopetrilli.it/userfiles/files/molabilijefoxuxutototo.pdfIn PDF document text
- https://thefertilizerequipment.com/d/files/18437878381.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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e12b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE12B	19708 bytes
SHA-256: `69d15ae9d651a839e27e72f22a3519b45c1b2b7a25adcdba46a3493ae8a675dd`
`font_01_sfnt_off0001119f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1119F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000129b6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x129B6	12332 bytes
SHA-256: `b3a7d6a2431272323795be67dea767c2dad80be9683ccc455d153e99c1f6ff9e`

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