PDF malware analysis — malicious · 1a832d2c90f4bf3e

MALICIOUS

PDF

77.2 KB Created: 2021-09-02 19:03:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: 67a31245f7f5eb30fa6e045923caacfe SHA-1: 1f28ddb63cbf551eab75bc2459f1fc477fa9fc2b SHA-256: 1a832d2c90f4bf3e2d5e53650a22023f919d1eb75e5fed0bd8f180da6c5802c1

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or redirection scheme. The ML classifier strongly indicated maliciousness, and the presence of external URIs and link farms points towards an attempt to lure users to potentially malicious destinations. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or SEO manipulation campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9943

Heuristics 5

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://inwebjor.ru/uplcv?utm_term=english+dictionary+download+pdf+file PDF link annotation
- https://www.adom.biz.pl/ckfinder/userfiles/files/papezoxozevetuful.pdfIn PDF document text
- http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160726e73523b7---38904136853.pdfIn PDF document text
- https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/f1dc735e86fe44234e6a1d69f86074e0/96406257596.pdfIn PDF document text
- https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874bced3622---16512047220.pdfIn PDF document text
- http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wibedogu.pdfIn PDF document text
- http://dichvuhangngay.vn/uploads/image/files/36064903232.pdfIn PDF document text
- http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074d33468eec---negajutusopil.pdfIn PDF document text
- http://bukharajohnscreek.com/sites/default/files/file/ragiwimuf.pdfIn PDF document text
- https://binarbaidfabrication.com/public_html/userfiles/file/vixekolojogemevevetadu.pdfIn PDF document text
- https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/3dd2a59f627793b8e034b0548854faa5/19532297678.pdfIn PDF document text
- https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/99ef07ddd293e9192e52c9e3c942d521/dezolol.pdfIn PDF document text
- http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c22a6b865---90571239744.pdfIn PDF document text
- http://agendaalzheimer.org/files/galeria/files/76954212350.pdfIn PDF document text
- http://duonglaohanoi.com/userfiles/file/deteripevudilojep.pdfIn PDF document text
- https://q-web.ro/wp-content/plugins/super-forms/uploads/php/files/m83fii67uvdod3ga6t6stkectq/lujawukovopofe.pdfIn PDF document text
- http://kondicionery-vidnoe.ru/upload_picture/file/lagugofosezipetu.pdfIn PDF document text
- https://tvmreza.tv/ckfinder/userfiles/files/nepukemamijopodigezovi.pdfIn PDF document text
- https://melz-feu.ru/upload/sofoxozubiwizivizaza.pdfIn PDF document text
- https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/011e75d5f04f25f0fdefdb5e730f2f2c/33748381339.pdfIn PDF document text
- http://asea-admin.com/_userfiles/file/20210612192522.pdfIn PDF document text
- http://marcobernini.it/userfiles/files/85536329845.pdfIn PDF document text
- https://getracemirates.com/userfiles/files/89036296011.pdfIn PDF document text
- https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1608445f7c1c65---zesuli.pdfIn PDF document text
- http://altaprecision.com/userfiles/file/6032762062.pdfIn PDF document text
- http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612daa028a96b---pajomenugan.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_off0000c963.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC963	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000e175.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE175	17372 bytes
SHA-256: `b8a5f07305bb90288791d8c201ebad63f78411c202fe9887140e956fbc744171`
`font_02_sfnt_off00010d7a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10D7A	11084 bytes
SHA-256: `1128c01f217906c2c8177b73a60ffff46137ca88a87055cfb7a9ea63c56b6c28`

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