PDF malware analysis — malicious · e5590bc13202d586

MALICIOUS

PDF

80.6 KB Created: 2021-09-19 03:24:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: a9774432e7855ba02123588815e0fc28 SHA-1: 0aea048e5ba14dfd5bb83786e90997a5de1fcf98 SHA-256: e5590bc13202d58674ab0262ee6453ded2e38ba556cce33c9daaf391eb8b6ea1

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating link farms on such hosting, likely to direct users to download malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, with ClamAV identifying it as a phishing trojan.

Machine Learning

Nyx PDF Classifier malicious score 0.9955

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=ping+mobile+download+apk PDF link annotation
- https://propiedades.net/ckfinder/userfiles/files/bedefivinokadefeko.pdfIn PDF document text
- http://interreg-ipa-husrb.com/downloads/lezokib.pdfIn PDF document text
- https://ms1oke.com/contents/files/9701134010.pdfIn PDF document text
- http://reckdance.pl/userfiles/file/17958410638.pdfIn PDF document text
- http://timavoshipsupply.it/userfiles/file/62233165364.pdfIn PDF document text
- http://tachikawa-derma.biz/ckfinder/userfiles/files/82593733330.pdfIn PDF document text
- https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/ef2abf03260f6f94246ffac78a40c4bf/17481155981.pdfIn PDF document text
- http://paroissedementon.fr/upload/files/guwivanenekuzexara.pdfIn PDF document text
- https://cebrium.ssnn.ro/images/81244245659.pdfIn PDF document text
- https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/32772152892.pdfIn PDF document text
- https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1a4cbc43649c869d6ddcba2f2309c8b6/lajukuzo.pdfIn PDF document text
- http://theprofitnesstrainers.com/userfiles/file/zixufuwinalivipikajukuw.pdfIn PDF document text
- http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/4a819e7719a8772b058d94d7bd0329e4/ditudevizav.pdfIn PDF document text
- https://goooinggroup.com/userfiles/files/20210911_055629.pdfIn PDF document text
- http://ux-school.ru/files/files/fipog.pdfIn PDF document text
- https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161339a021f9c2---85422549429.pdfIn PDF document text
- http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/b893debc65758638f481b6452d3086ed/85311116855.pdfIn PDF document text
- http://hawaiianhunareiki.it/file/firupotedazoz.pdfIn PDF document text
- https://buildingexpertsdirectory.com/ckfinder/userfiles/files/40443459616.pdfIn PDF document text
- https://cafesca.mx/ckfinder/userfiles/files/48562407307.pdfIn PDF document text
- http://pallenberg-busreisen.de/uploads/files/31899305048.pdfIn PDF document text
- http://duythuc-bearing.vn/uploads/userfiles/file/24700412407.pdfIn PDF document text
- https://www.adom.biz.pl/ckfinder/userfiles/files/3748089026.pdfIn PDF document text
- http://first-group.kr/ckupload/files/20581709029.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_off0000d7ba.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD7BA	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000efd1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEFD1	10688 bytes
SHA-256: `b7121261007b4e426e62d6c036865611dfe4da3b169531b929e085e45dd564fd`
`font_02_sfnt_off000107d6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x107D6	17716 bytes
SHA-256: `05099f07bf6909a2b762b1e6e33379c1df0a9d5cff3e8524621a18f013e66e2f`

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