PDF malware analysis — malicious · a1aee1b3a6792c86

MALICIOUS

PDF

69.2 KB Created: 2021-09-21 00:48:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: bac895d8bff285b56b5cbc1af8747476 SHA-1: 975d898235e99cc5a2613584a8dd0ae213b85397 SHA-256: a1aee1b3a6792c862baff2d3c5a545bd5dcdd44f8357dece058eea92bcece2b1

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous compromised WordPress upload directories and other disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of external URIs and the nature of the link farm indicate a phishing or malware distribution attempt.

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 http://exito-opakowania.pl/userfiles/file/wukisoduwopozubuvuxa.pdf In PDF document text
- http://infunplastic.com/d/files/21463257874.pdfIn PDF document text
- http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413f0497ed2---dajezab.pdfIn PDF document text
- http://gwardiajuvenia.pl/zdjecia/fck/file/nasipizumelilugudibifako.pdfIn PDF document text
- https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161417a115c494---81864873880.pdfIn PDF document text
- https://pikhospital.com/ck_uploads/uploads/files/zigurezivak.pdfIn PDF document text
- http://thsport.dk/ckfinder/userfiles/files/84434833083.pdfIn PDF document text
- https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144e83078f0b---40440735992.pdfIn PDF document text
- http://firesecurity.sk/userfiles/file/50217226121.pdfIn PDF document text
- http://fotografieindex.nl/images/uploads/67734182350.pdfIn PDF document text
- http://skonasystems.com/userfiles/file/gobovuwawupi.pdfIn PDF document text
- http://falerisztika.hu/tmp/26099914555.pdfIn PDF document text
- http://theseadiaries.com/ckfinder/userfiles/files/rowufexivozatenenuwumijoz.pdfIn PDF document text
- https://www.tocbirsen.org.tr/ckfinder/userfiles/files/50064979719.pdfIn PDF document text
- http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/levanorenupelolevirujevi.pdfIn PDF document text
- http://kondicionery-dzerzhinskij.ru/upload_picture/file/67910775671.pdfIn PDF document text
- https://delphin-restaurant.com/ckfinder/upload/files/32075752178.pdfIn PDF document text
- https://bonvoyageindia.in/ckfinder/userfiles/files/doveti.pdfIn PDF document text
- http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/161357e0fde76a---51696839342.pdfIn PDF document text
- https://siam-royal-view.ru/data/files/xesap.pdfIn PDF document text
- http://biplano.eu/userfiles/files/17817637155.pdfIn PDF document text
- https://sportuna.be/ckfinder/userfiles/files/80451923363.pdfIn PDF document text
- https://tarzminder.com/resimler/files/67192372080.pdfIn PDF document text
- http://kossuthdigisuli.hu/userfiles/file/80769999221.pdfIn PDF document text
- http://pizzeria-millemiglia.de/app/webroot/img/editor/file/26197829434.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=can+android+play+fortnitePDF 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_off0000b354.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB354	14316 bytes
SHA-256: `59cad23b9c2d1aa64a14e7af18d7d7b5292739e4e7c40e38416b0221f9a1ab79`
`font_01_sfnt_off0000d71b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD71B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000ef32.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEF32	10468 bytes
SHA-256: `e5b00cb7cf2a8f6d5cca714c72f3a0eae272386b09debf176870cc94052c44c8`

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