PDF malware analysis — malicious · 6ac9e4a15ae7b9a4

MALICIOUS

PDF

80.9 KB Created: 2021-09-03 09:23:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 155e951cf831e75e71ef473e9a124a80 SHA-1: 23584239db427536729b5b3f967ef0d485193ab3 SHA-256: 6ac9e4a15ae7b9a42686c9475f677b312abd2cfffa950cd8a7be968144716957

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm structure, suggesting the PDF's primary purpose is to redirect users to these external sites. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

Nyx PDF Classifier malicious score 0.9917

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 http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a87413ab8fa---nedoxefasabibizedenad.pdf In PDF document text
- https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6b87126ee760039a9f08e9f37b5be850/zazogadelofojujijap.pdfIn PDF document text
- http://nprofit.hk/userfiles/50671067162.pdfIn PDF document text
- http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f5cae3e2e---94686554432.pdfIn PDF document text
- http://aylincinarli.com/fckfiles/file/taletus.pdfIn PDF document text
- https://transport-vehicules.fr/userfiles/file/40320730284.pdfIn PDF document text
- https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/a0542a537fac3ca19e36e1781abdf499/87117238818.pdfIn PDF document text
- http://eaas-journal.org/survey/userfiles/files/divemekovevelakazujetowe.pdfIn PDF document text
- http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160860e06cfc88---14936148254.pdfIn PDF document text
- http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d91f4e27c75---41927615096.pdfIn PDF document text
- http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/40618262302.pdfIn PDF document text
- https://cebubigsellers.com/userfiles/file/wewarawoji.pdfIn PDF document text
- http://fzcce.com/aimgs/uload/files/69245311644.pdfIn PDF document text
- http://www.kymkarajok.net/tiedostot/files/35269621267.pdfIn PDF document text
- https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/t5dp921hmfclurn2l3o6hsbci7/99947935142.pdfIn PDF document text
- https://sanaspinler.com/calisma2/files/uploads/solovegoxuz.pdfIn PDF document text
- http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e4ef99fc2---vosixutozowuwudekujaduvad.pdfIn PDF document text
- http://al-bandak.com/userfiles/file/jemusu.pdfIn PDF document text
- https://arrayamed.com/userfiles/file/34748309427.pdfIn PDF document text
- http://asea-admin.com/_userfiles/file/20210816212713.pdfIn PDF document text
- https://hophamthaibinh.com/upload/files/41449015109.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fed467b73c---95285987901.pdfIn PDF document text
- http://thegioivaigiasi.com/Images_upload/files/31302528826.pdfIn PDF document text
- https://grandhotelbulgaria.com/userfiles/file/dovejeliditenibulijoxavu.pdfIn PDF document text
- http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123683d08243---14959473608.pdfIn PDF document text
- http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de36a23a1b5---memevagugi.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=convertir+un+pdf+en+word+en+linea+gratisPDF 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_off0000d15e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD15E	10956 bytes
SHA-256: `5bf807a6e78af963534414f932ee8ea67bf6f16ccea496a51b03eb30c296dfe7`
`font_01_sfnt_off0000eacc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEACC	19624 bytes
SHA-256: `d6159effc823776737c47e3d33419e5b2dd7a6427dfd153fa6644eb1a086bc7d`
`font_02_sfnt_off00011be0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11BE0	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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