PDF malware analysis — malicious · 49f9cd7f0eeb12b8

MALICIOUS

PDF

86.8 KB Created: 2021-07-01 23:06:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 768f00efa3372a3f2918f1dd1f3225ad SHA-1: bf178d26abff0fa126b4675eb8ca662f5a08e3f7 SHA-256: 49f9cd7f0eeb12b89bfa7059735381f014c1c1aa4758ef300f955a2de86bf6a6

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains a large number of links, many of which point to compromised WordPress sites. The ML classifier strongly indicates maliciousness. The document's structure suggests it is designed to act as a link farm, potentially for SEO poisoning or to redirect users to malicious payloads hosted on these compromised sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

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://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/d04f1c1bbed79ae80422ac11096e935c/fakulizuxobunetixekuzov.pdf In PDF document text
- https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dac600d2be---sinojonetotikezofapavi.pdfIn PDF document text
- http://bahattinburyan.com/userfiles/file/tenogeker.pdfIn PDF document text
- http://matchedtubes.de/userfiles/file/foxaxevozobovakuj.pdfIn PDF document text
- https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc04ecca38---62811892294.pdfIn PDF document text
- http://allycatering.com/userfiles/64009164547.pdfIn PDF document text
- http://toonesk.com/upload/47093782514.pdfIn PDF document text
- http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffd815fe1a---bivudiv.pdfIn PDF document text
- https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/c76ea979bf15dd80352d37728c62fa4e/87400896582.pdfIn PDF document text
- http://vyveva.eu/UserFiles/File/kivesikimipa.pdfIn PDF document text
- http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c73780f467---nisifivajosivowomozaf.pdfIn PDF document text
- https://dbjadow.pl/attachments/file/lusizibub.pdfIn PDF document text
- https://rybczewice.pl/userfiles/file/29511798147.pdfIn PDF document text
- https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6fd87d4dc---237709856.pdfIn PDF document text
- http://amandatravel.com/userfiles/file/63605875972.pdfIn PDF document text
- https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3436131285---21961780252.pdfIn PDF document text
- https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/fibbkbbtqhn71bmj5tnavof0d4/kirezedimupir.pdfIn PDF document text
- http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/03e6e4d2417143063f563bc8a92aeb66/54317866376.pdfIn PDF document text
- http://a-kamen.com/userfiles/file/92933765835.pdfIn PDF document text
- https://trouver-une-ssii.com/img/pics/files/ragupibirudoxigafotib.pdfIn PDF document text
- http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a8e224abe---54122656538.pdfIn PDF document text
- https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9355674cb8---46163856509.pdfIn PDF document text
- http://automsystem.com/UploadFile/file/20210507055551213.pdfIn PDF document text
- http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/8nj5gao250h7mftrpp165jpjd6/53578530986.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=all+you+can+eat+seats+dbacksPDF 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_off0000eec2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEEC2	10600 bytes
SHA-256: `bac5ac0f9294123df1f653dfeebdf362151a81588023c98827500f7f374d30d8`
`font_01_sfnt_off00010732.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10732	17720 bytes
SHA-256: `c2c7c0ac01a10e796d1a5c2ed4849fcf40b3400319ade0f2f70a5fcc26399798`
`font_02_sfnt_off000135c9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x135C9	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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