PDF malware analysis — malicious · f829e7166bef70d6

MALICIOUS

PDF

82.5 KB Created: 2021-09-09 13:50:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 403efb9312c8bfd4d79ea88fa01a3c03 SHA-1: 56b170f3952c32926ba50401f0f1a3c583a9f059 SHA-256: f829e7166bef70d6ca4b07f9591561884cc194ce596269a2e31cd90a0e6c5cb8

176 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous external links, some pointing to compromised CMS upload directories, suggesting an attempt to lure users to malicious sites. The presence of a QR code lure further supports a phishing or redirection-based attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9992

Heuristics 7

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.
QR-code redirect lure medium SE_QR_LURE

Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
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://insuralead.com/userfiles/file/84440743972.pdf In PDF document text
- http://bielle-srl.com/userfiles/files/dalutepu.pdfIn PDF document text
- http://gardens-spa.com/user_pict/file/sivaxuselug.pdfIn PDF document text
- https://ego-sofa.tw/uploads/files/202109020447585318.pdfIn PDF document text
- http://max-metal.pl/gfx/file/mijufugedave.pdfIn PDF document text
- http://mulroyenvironmental.ie/userfiles/file/8532249512.pdfIn PDF document text
- http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161355779603e3---diwibudufi.pdfIn PDF document text
- https://coimbatorepressclub.com/FCKeditor/userfiles/file/kasupeke.pdfIn PDF document text
- http://irvinenott.co.uk/ckfinder/userfiles/files/ritepomeferugiguvew.pdfIn PDF document text
- http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16135b60e6e077---57826568571.pdfIn PDF document text
- https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/ac6dcb3e7a2d30e03c8255d90a9e4904/2882191140.pdfIn PDF document text
- https://doxity.ro/ckfinder/userfiles/files/95901457105.pdfIn PDF document text
- https://www.milestonesmn.org/ckfinder/userfiles/files/19905361790.pdfIn PDF document text
- https://weilaimachinery.com/userfiles/files/18655350489.pdfIn PDF document text
- http://babamoleskine.com/files/file/25718216696.pdfIn PDF document text
- https://muachungbaohiem.com/uploads/userfiles/file/87628225642.pdfIn PDF document text
- https://pchome.uzai.ca/upload/files/54458518929.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=rk3318+android+11PDF 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_off0000e13a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE13A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f94c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF94C	17296 bytes
SHA-256: `feb1a85577661eea2597a6b1e40acefdfe34b7d8ded84255f443cb5a7aea9d49`
`font_02_sfnt_off00012603.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12603	10364 bytes
SHA-256: `392d4ba3b44e86e06ca5cece1f436382e5dc2c96071267720178f2a771e3bd77`

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