PDF malware analysis — malicious · 37bc9b539e7b36fb

MALICIOUS

PDF

88.0 KB Created: 2021-09-17 03:26:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: d7727577d1d9e0e45feb789dc7bd204e SHA-1: c4ff43a972aa1bd636feee6581212bf29af42c61 SHA-256: 37bc9b539e7b36fb5d2ca916ac39708d5fe41a270ed9604cc78eb4c2e02329c8

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be compromised or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing a secondary payload. No scripts were extracted, but the PDF structure itself facilitates redirection to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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://queure.ru/uplcv?utm_term=what+is+android+wear+support PDF link annotation
- http://laser-piskovani.cz/democms/userfiles/file/govizetutanuvorojevixa.pdfIn PDF document text
- https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/50250573413e439ad6e6083170313e9b/2132100212.pdfIn PDF document text
- https://nibrasimansch.com/userfiles/files/97541762432.pdfIn PDF document text
- http://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/65396500678.pdfIn PDF document text
- https://alaskaproauto.net/nbloom/fckuploads/file/xaxuwaxeneruwixemiguwowan.pdfIn PDF document text
- https://voxel-avocats.fr/uploads/file/In PDF document text
- http://urjabatteries.in/userfiles/file/20028828277.pdfIn PDF document text
- http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/94069905778.pdfIn PDF document text
- http://simsvizag.com/contentimages/file/nifazumo.pdfIn PDF document text
- http://iehyun.com/editorupload/file/13165112666.pdfIn PDF document text
- http://thienminhgroup.com/uploads/userfiles/file/83194501108.pdfIn PDF document text
- http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1613667ff120b1---17841880504.pdfIn PDF document text
- https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/539f3be66cb1b53b9e973aff15d967bd/famijapufobesa.pdfIn PDF document text
- https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/92a29e4bb8bbeee248f0a2b5bab75c87/felaseg.pdfIn PDF document text
- http://polaryachtmanufactory.com/res/wysiwyg/file/vazewujepoxo.pdfIn PDF document text
- https://weldingportal.it/userfiles/file/pegapudivewujelugu.pdfIn PDF document text
- http://lactopad.com/uploads/files/92666692591.pdfIn PDF document text
- https://oreopay57.com/ckfinder/userfiles/files/16779848459.pdfIn PDF document text
- http://vitacanes.com/uploads/files/putalisog.pdfIn PDF document text
- http://kapelski.pl/userfiles/file/puzilaf.pdfIn PDF document text
- http://ain.proximeo.com/ckfinder/userfiles/files/pubodivexuwojo.pdfIn PDF document text
- https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e2d26e5ec---sotikazadarixufuzi.pdfIn PDF document text
- http://apple888.vn/luutru/files/56189189900.pdfIn PDF document text
- https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/1oudl5onbhlc92bhru75b1vkv7/59351683886.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_off0000f281.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF281	10624 bytes
SHA-256: `5ec1b5f1f5c56a433488a5cb7ca18e950e3efd6a4eae5e137a4ef00c23591617`
`font_01_sfnt_off00010ad1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10AD1	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000122e3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x122E3	18456 bytes
SHA-256: `29ac43e167a9937d9e4c7abd62b598612c686b73586a4836538e3c59a83c6dba`

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