PDF malware analysis — malicious · 287a49a79a77b88c

MALICIOUS

PDF

91.2 KB Created: 2021-07-07 02:21:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15

MD5: 3644a543cf1e77b2ee1354aa3f9f0621 SHA-1: 847b2b8d6c3340dfafa4d816a5b61ce6d602986e SHA-256: 287a49a79a77b88c23b3b301c50abcb80fac324ed26133aa471dc6dcc3dda732

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by a ClamAV signature and an ML classifier. It functions as a link farm, containing numerous URLs that point to external websites. Several of these URLs are hosted on compromised WordPress installations, indicating a potential phishing or malware distribution scheme.

Machine Learning

Nyx PDF Classifier malicious score 0.9822

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://global-insurance-broker.de/downloads/23879989438.pdf In PDF document text
- https://dolcezzecaffe.it/file/xamixowasibegowuliraja.pdfIn PDF document text
- http://zuche0551.com/upload/file/89050618361.pdfIn PDF document text
- http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607553e47bd97---89651104173.pdfIn PDF document text
- http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b86c30c6007---82034192021.pdfIn PDF document text
- https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/5e438f15358f5a6e71d15f75dfdb47d2/jaliruvuwumamitumasasime.pdfIn PDF document text
- https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a142f3aeaa---93071355917.pdfIn PDF document text
- http://princeworldwide.com/multimedia/userfiles/file/lasajesavim.pdfIn PDF document text
- http://olversonfamilyreunion.org/clients/5/51/51a48c89da211807e19ed56f8a1a1822/File/bexetul.pdfIn PDF document text
- https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/picpcpr6irjktn417h7oi8mav2/modigefozezozubusomujates.pdfIn PDF document text
- https://cape-electronics.com/media/file/82220751725.pdfIn PDF document text
- https://seikico.net/img-tym/files/madanu.pdfIn PDF document text
- http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608f19c9cba67---bodojetinaku.pdfIn PDF document text
- https://sanipacific.com/attachment/file/29473349901.pdfIn PDF document text
- https://gea99.com/ckfinder/userfiles/files/50079126679.pdfIn PDF document text
- https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c41aa055a79---77064648727.pdfIn PDF document text
- http://freeski.hu/freeski/file/zowoguralaj.pdfIn PDF document text
- http://dxczx.com/ckfinder/userfiles/files/20210617_110403.pdfIn PDF document text
- https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160c21024a0579---520674147.pdfIn PDF document text
- https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160787ec64952e---13205267837.pdfIn PDF document text
- https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084de15b2f6a---fulubuvogoz.pdfIn PDF document text
- http://czdashan.cn/uploadfile/file/2021070101001073499.pdfIn PDF document text
- https://pubgpin.com/calisma2/files/uploads/tutabowawoxerizokat.pdfIn PDF document text
- http://supair-lux.hu/ckfinder/userfiles/files/2677704693.pdfIn PDF document text
- https://aynadakikemalizm.com/resimler/files/vizerilataviguwopu.pdfIn PDF document text
- https://zegaoyun.com/calisma2/files/uploads/28471021835.pdfIn PDF document text
- http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/fe686eb57256ac8a05ed7d543c166034/41001796797.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=company+law+and+secretarial+practice+notes+pdfPDF 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_off0000fb53.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFB53	19468 bytes
SHA-256: `fff4a30e2c3818453507b8c15d51b1cdc16c6d6b8e38d76102f87bedffc31942`
`font_01_sfnt_off00012d14.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12D14	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001452b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1452B	11012 bytes
SHA-256: `cb8ae321cf83c63ebaf21acaee58f3c5108263274201d804f361663c2d247b1a`

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