PDF malware analysis — malicious · fd4db0437b30ca9d

MALICIOUS

PDF

81.9 KB Created: 2021-09-11 11:00:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 36abaaed001d3649df781f2ea34df037 SHA-1: a2e4362ac247b579d6d857fadf422d20da1a1269 SHA-256: fd4db0437b30ca9d13f19aa694f1b48790e0cf0172e0c167e9af7b5766fe9a74

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. It contains a link farm with numerous URLs pointing to compromised WordPress sites and other disposable hosting, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the presence of multiple external URIs and the 'link farm' heuristic strongly indicate a phishing or malware distribution lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9946

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 https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/lno2u53vedr8v8sis3jqmoh0d1/busazivapiluwivenor.pdf In PDF document text
- https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134cf93cdda6---letapipor.pdfIn PDF document text
- http://fillaracingacademy.cz/ckfinder/userfiles/files/xuzaletekema.pdfIn PDF document text
- http://fisioterapiasuzzara.it/userfiles/files/mafojora.pdfIn PDF document text
- https://bestofbucerias.com/upload/file/70071382171.pdfIn PDF document text
- http://idrogastermoclima.it/Utentifile/FCKPage/file/ribeg.pdfIn PDF document text
- http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307a4362b3b---vamogozat.pdfIn PDF document text
- https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/bazowowalujumixe.pdfIn PDF document text
- http://jmk.kr/ckfinder/userfiles/files/pimowefarotidogerofadaja.pdfIn PDF document text
- http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/6273032527.pdfIn PDF document text
- https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/wenit.pdfIn PDF document text
- http://slovbau.sk/test/userfiles/file/88634451010.pdfIn PDF document text
- http://radissonhoteltraining.com/userfiles/file/81781626466.pdfIn PDF document text
- http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161321513d7679---84695691913.pdfIn PDF document text
- http://mmprogetti.it/userfiles/files/88331224620.pdfIn PDF document text
- http://philipp-haberland.de/images/upload/file/63375831736.pdfIn PDF document text
- https://wtmasonry.com/ckfinder/userfiles/files/xanoxojezifexawonofalena.pdfIn PDF document text
- https://promenade-perpignan.com/userfiles/file/nusorufuju.pdfIn PDF document text
- http://patriabrno.cz/userfiles/files/78933270429.pdfIn PDF document text
- https://bushregenerators.biz/userfiles/files/54878410222.pdfIn PDF document text
- http://soft-pro.hr/upload/datoteke/demabemisoduzudur.pdfIn PDF document text
- https://tavcam.com/upload/ckfinder/files/18029499221.pdfIn PDF document text
- https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/6937412836.pdfIn PDF document text
- http://gruaszarate.com/ckfinder/userfiles/files/54370681694.pdfIn PDF document text
- https://ceiling.holcom.vn/webroot/img/files/bakoxumevomatosariwofog.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=master+craft+new+world+craft+2020PDF 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_off0000d6f2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD6F2	10696 bytes
SHA-256: `b0f1af82b9661285eda5fb149b56bacb3bcc7fe6ea1c813449469439d04e1996`
`font_01_sfnt_off0000efc8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEFC8	18880 bytes
SHA-256: `8e94bc3483d31bec477e5ef5222b4b693798179be0bd89624f0684e585559bd3`
`font_02_sfnt_off00012035.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12035	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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