PDF malware analysis — malicious · 5b9e6a44763151b9

MALICIOUS

PDF

76.3 KB Created: 2021-09-17 14:52:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 10981981847e3991c7afecec77891594 SHA-1: 439816aecafdab9add240a8dfbdcc759b960fb45 SHA-256: 5b9e6a44763151b957b0571a960ac0ea50d05e16f0162fff013e5ed827643779

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to other PDF files hosted on potentially compromised or disposable domains, indicating a link farm designed to distribute malicious content. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9948

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://pnmanagementsolutions.in/uploads/wulugofiwusamonaw.pdf In PDF document text
- http://star-transform-moscow.ru/uimg/files/sidatulujixi.pdfIn PDF document text
- https://un7un9b3rl1pa7-99.com/contents/files/lonutipoxijavetafufifawe.pdfIn PDF document text
- http://ccsl.asia/files/41983373222.pdfIn PDF document text
- http://kondicionery-elektrostal.ru/upload_picture/file/zaludarenitabonefanidi.pdfIn PDF document text
- https://dhesient.com/media/jixixokipiju.pdfIn PDF document text
- https://psihodesk.ro/ckfinder/userfiles/files/pixurokidakuwir.pdfIn PDF document text
- http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/87058179161.pdfIn PDF document text
- http://biznesfishki.ru/files/userfiles/files/zimilipanet.pdfIn PDF document text
- http://mexxeopaint.com/upload/files/25905660544.pdfIn PDF document text
- https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/e54877a41334c752062ea78881afe33b/rafivexejazowob.pdfIn PDF document text
- http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/5a5c1296b3c52e0bfada74ed79745611/fitukaxiti.pdfIn PDF document text
- http://gamax-moto.cz/data/dokumenty/faruwikuwubadusi.pdfIn PDF document text
- http://lynxitservices.com/ckfinder/userfiles/files/26874120911.pdfIn PDF document text
- http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/degedosemixaz.pdfIn PDF document text
- https://slotpt2.com/contents/files/jejijenaxolovoturuje.pdfIn PDF document text
- https://eravukappalpalli.com/userfiles/file/67186358399.pdfIn PDF document text
- https://uslugiinzynierskie.com/eurostyl/photos/file/linamojuzaxumeteluwanupij.pdfIn PDF document text
- https://tekstilkentrehber.com/upload/ckfinder/files/kizel.pdfIn PDF document text
- https://speculatio.in/ci/userfiles/files/92909125586.pdfIn PDF document text
- http://angarakshaksecurity.com/userfiles/file/47201607299.pdfIn PDF document text
- http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a1fff4e976effb2c611e8a97e33dc43b/wulatasinivimivetofivi.pdfIn PDF document text
- http://mbeautyconcept.com/upload/content_images/file/52555773116.pdfIn PDF document text
- https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/66oh16gsm99aaalri1ne2ku4s6/lolijudojotigoluzu.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=quickshot+app+android+downloadPDF 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_off0000c488.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC488	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000dc9a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDC9A	17740 bytes
SHA-256: `61c48c23728e35fa2be28d0d2ba4c82fd90e124cf0d2901fa7542b022cf20ce6`
`font_02_sfnt_off00010a84.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10A84	10816 bytes
SHA-256: `2d380beb24778ce77aa64b0a65fb40ac07c1c2224b650c142917c33c108875b7`

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