PDF malware analysis — malicious · 4b94fbaa195f1d22

MALICIOUS

PDF

80.4 KB Created: 2021-09-02 21:31:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 731bba1226b3df594cffcf129180e090 SHA-1: 804210bab669324925ade31bd3d75cd28112a2e1 SHA-256: 4b94fbaa195f1d22a66de5c86c70f6db6e5e7e47b9ab0811891b012019d2f13f

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The file functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely serve as a distribution mechanism for phishing or malware, potentially exploiting vulnerabilities within the PDF reader.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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://perfecthospitals.org/FCKeditor/file/kodasubebijinepunapoker.pdf In PDF document text
- https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/7459a4f8f71a21ef083fd5167699f816/47324006223.pdfIn PDF document text
- http://mdbim.pl/ubezpiecz/obrazy/file/79546269576.pdfIn PDF document text
- https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c34343e5212---39120808615.pdfIn PDF document text
- https://ntpuvoice.com/ckfinder/userfiles/files/22231083218.pdfIn PDF document text
- https://texigo.tw/upfile/files/2021/08/20/pomes.pdfIn PDF document text
- https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/9eflo3i1kfhrpeec9ku9j9tnjd/31853777975.pdfIn PDF document text
- http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607289475fa93---jediporod.pdfIn PDF document text
- http://wabasnb.com/files/fckeditor/file/93592497360ae08862dca8.pdfIn PDF document text
- http://leebyunghun.org/new/upload/board/files/67933955868.pdfIn PDF document text
- https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e146d3c69---86910188363.pdfIn PDF document text
- https://delaneyllc.com/ckfinder/userfiles/files/xisepekiwadoduti.pdfIn PDF document text
- https://alohasafaris.com/files/gotakuzowosop.pdfIn PDF document text
- http://asvpp.fr/pdf/zetuzupofetabujudowepet.pdfIn PDF document text
- https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/e97d7e316e814fd3c1d82346a6aa9863/36928951842.pdfIn PDF document text
- http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611eccba294cd---tobasofogufoj.pdfIn PDF document text
- http://remaining-mc.de/userfiles/file/jonifimureraweropo.pdfIn PDF document text
- https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088f790de656---lomadikum.pdfIn PDF document text
- https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b619c91e4cc---87546867064.pdfIn PDF document text
- http://leebyunghun.kr/new/upload/board/files/wopesefumisavovi.pdfIn PDF document text
- http://tomgiongvip.com/uploads/files/file/24050603090.pdfIn PDF document text
- http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728d7575a52---52165075593.pdfIn PDF document text
- https://aslimitada.com/userfiles/file/36082899287.pdfIn PDF document text
- http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b34c10bfb6---xezibawamajiso.pdfIn PDF document text
- https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/78mr6adrhe59vuggcombm2sshj/xipelulawijonaj.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=discrete+math+schaum+series+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_off0000d3b9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD3B9	10716 bytes
SHA-256: `ef522c26dc53ed406480fd11c3f5fbacd1a23864dd48fe8a78f7daf523cd677c`
`font_01_sfnt_off0000ec5c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEC5C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001046e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1046E	18228 bytes
SHA-256: `2220c2e6994b059bd832b452c16145491307781150bf02a34714c68b0a943192`

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