PDF malware analysis — malicious · 19c2b69244909ace

MALICIOUS

PDF

86.2 KB Created: 2021-07-18 08:28:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: 97263d8d7a9530712c22d9558158a315 SHA-1: 870d3dada392bb8893e6fb8b772fb3c27edeebbc SHA-256: 19c2b69244909ace5ffec5f9544edf844d387aa66b9150659c049bbef78497df

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, indicating an attempt to hide its true purpose.

Machine Learning

Nyx PDF Classifier malicious score 0.9848

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://newo.ru/files/files/22229073035.pdf In PDF document text
- https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/0cb92ea411800467407c77bde37ef594/56151386881.pdfIn PDF document text
- https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b43a1294b1f---75644964791.pdfIn PDF document text
- https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609df329a8ad7---82256304889.pdfIn PDF document text
- https://santchavarabed.in/ckfinder/userfiles/files/94218764543.pdfIn PDF document text
- http://519pf.com/userfiles/files/finijokowefin.pdfIn PDF document text
- http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608a60f3dcd38---96483641442.pdfIn PDF document text
- http://viprealestatebrokers.com/userfiles/files/tasuxumuteviroveki.pdfIn PDF document text
- https://ngusacdon.com/upload/files/4695398322.pdfIn PDF document text
- https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/ed87fdfaca32801e0d5ebf7aaede4423/37273574889.pdfIn PDF document text
- http://thunderstar.cn/userfiles/file/20210513192216124941309.pdfIn PDF document text
- https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/cv7lcmmr9cvldo20ebk9looo96/52690763795.pdfIn PDF document text
- https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d08dd9db5---dodojobofafonamoserewi.pdfIn PDF document text
- https://paperland.bg/uploads/file/zupaxeniziwefojotobuvuf.pdfIn PDF document text
- https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/2b1951f0063895437a64b8a31d4faea0/93718792766.pdfIn PDF document text
- https://wfca-czech.cz/temp/userfiles/files/43709598058.pdfIn PDF document text
- https://yingzhaoliuart.com/upload/file/zorejukepe.pdfIn PDF document text
- https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/9458f33269379e0eecc9001945563b60/gojuwawutabawumugufo.pdfIn PDF document text
- https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/66e97935c3edf6e0d08ce29c1d82b01f/7151293034.pdfIn PDF document text
- http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/18182282776.pdfIn PDF document text
- https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/09aea5419247e37fe1ef3df8c36b79ee/40424103049.pdfIn PDF document text
- https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/cf4b0024b63b6e40c555ada163f25036/681730229.pdfIn PDF document text
- https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/0gs5bp43sqka3csmj80re927vc/bagoxatojizelazegipisilab.pdfIn PDF document text
- http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae85d4586d0---nipexopubatimovojogivaxiz.pdfIn PDF document text
- http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3c66d2591---bawexozijetabaxuxexis.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=carbon+12+and+carbon+14PDF link annotation
- http://pro.ovh.net/~tribuene/images/banque/file/27783946714.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_off0000ef77.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEF77	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0001078e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1078E	10248 bytes
SHA-256: `a9a591f22a930df608b4382ad8ff095189c7fdbef878818546acb1afc1ed765c`
`font_02_sfnt_off00011ec5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11EC5	17212 bytes
SHA-256: `905adb6136505bbf658b1204ada1bed6577859309c7b6c210b28b9a26bbb1d1c`

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