PDF malware analysis — malicious · b8804951cb03e5cc

MALICIOUS

PDF

87.9 KB Created: 2021-06-29 04:50:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25

MD5: ef69f85981d21816a9f566c597e2ef31 SHA-1: 6cf0ec22fcf111bd4a20d788b81165da1d645baf SHA-256: b8804951cb03e5ccff39540779ba7279247dd9a38b8e69bf7e5b93dde597eb9f

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress uploads or disposable hosting, suggesting a link farm designed to redirect users. The document body is heavily obfuscated and unreadable, but the heuristic firings strongly indicate a malicious intent related to URL redirection and potential exploitation.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

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://ampletrekking.com/userfiles/file/30674543221.pdf In PDF document text
- http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/cfa6544da4836e62b472779f455dc2c9/zowuleforudefoz.pdfIn PDF document text
- https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/b631125450cb8ffc23d4ae98e0f6f29a/20057075653.pdfIn PDF document text
- http://stevis.cz/files/file/lagez.pdfIn PDF document text
- http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b825e44407f---delafukotidedalupi.pdfIn PDF document text
- https://i3mit.com/shopadmin/upload/files/20770428703.pdfIn PDF document text
- https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7c521d9ef---26071704956.pdfIn PDF document text
- http://sgpeo.pl/users//file/xumuvikix.pdfIn PDF document text
- https://vestol.bg/files/file/52956692615.pdfIn PDF document text
- https://samsungvrvklima.com/upload/ckfinder/files/49027482130.pdfIn PDF document text
- https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/e6fb0355d8dcb371eb6db7d0839c3b5c/muwijunokukilak.pdfIn PDF document text
- https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/8gmv98tmqb784a1hotnmri65m4/gidiromag.pdfIn PDF document text
- https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/0af5ab368fbe6eeca8fbdda2419ae796/33357160871.pdfIn PDF document text
- https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/4f244d9bcc668e1d0c4338786cf79c45/zamopigaref.pdfIn PDF document text
- https://tepihtrava.rs//files/74516801279.pdfIn PDF document text
- http://novussiteyonetimi.com/uploads/file/nidawor.pdfIn PDF document text
- http://karinameal.com/imgdish/files/lamanetajenavekatobit.pdfIn PDF document text
- https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6ed1cda4a---20117685844.pdfIn PDF document text
- http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/39f77e071faa1438d98fc0cad4bcd99d/zamib.pdfIn PDF document text
- http://makingtheturngolf.com/clients/9/92/925d9bae4ecf380f28dbe0e1390c16eb/File/timutinatofukojutun.pdfIn PDF document text
- https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce761a4a45---laxebeluvumijimulepoteb.pdfIn PDF document text
- http://fszhenjia.com/upfolder/e/files/20210527195112.pdfIn PDF document text
- https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/2931f8fea0990f9709376af323e3bb8a/vubonudaru.pdfIn PDF document text
- http://vattucongtrinh.com/userfiles/file/fuvumufofogapejiji.pdfIn PDF document text
- http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c183d7f24f7---68270471106.pdfIn PDF document text
- http://blessedfamilycovenant.org/clients/c/cb/cb727bc273eb4203dc66fb73741ae5ae/File/45544523997.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=quotes+about+night+sky+and+moonPDF 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_off0000f570.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF570	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010d82.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10D82	16780 bytes
SHA-256: `8c169babc39fcc47d5d2e656df070e8ca03029384a67bc9aef641a5bd79bd96d`
`font_02_sfnt_off0001388a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1388A	11056 bytes
SHA-256: `97b0ea517cfa7ce3b1897ebd7709c1b62854e3379e00b2c0cf0d678407988c22`

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