PDF malware analysis — malicious · 49be37d65eedb856

MALICIOUS

PDF

71.8 KB Created: 2021-09-07 21:17:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: abb9544315985a05e1994953e77626cf SHA-1: 604f333623179e4889eb6ce791df15540f7a0927 SHA-256: 49be37d65eedb856d8b47c06eee7536ca6ec357735be348488aa414061755153

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm pointing to multiple distinct hosts, many of which are identified as compromised CMS upload directories. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution via these links. The document body is unreadable, but the heuristic firings clearly show the intent to redirect users to external, potentially compromised, resources.

Machine Learning

Nyx PDF Classifier malicious score 0.9849

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://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/8d23kpj1uvj73qag4dsrq1vj00/95160575985.pdf In PDF document text
- https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/36c7dadc5c1dca3002737d22b79f1304/jenoralofemoludexokokuk.pdfIn PDF document text
- http://adamlegal.com/userfiles/file/vonulud.pdfIn PDF document text
- http://www.bluewhaleline.com/image/upload/File/sumenojifujirosugilewita.pdfIn PDF document text
- https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f5d8157f0---noroxotexulasuxajel.pdfIn PDF document text
- http://alessandrobelleseveterinario.eu/userfiles/files/jonixowiwuzat.pdfIn PDF document text
- https://chp-travel.ir/data/file/13220408337.pdfIn PDF document text
- https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/e1f8df62429d0798a7baf30d055c9dee/49488909247.pdfIn PDF document text
- http://telektrans.hu/editor_up/jaxekalisanabuvavefi.pdfIn PDF document text
- https://songiadahoaian.com/upload/ck/files/logodema.pdfIn PDF document text
- http://eqletstalk.com/uploads/files/202109011838437486.pdfIn PDF document text
- http://arci-mp.fr/admin/File/69703083357.pdfIn PDF document text
- https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/e5a4e5a7ffc70ecd2745669d6e91d9f6/23712380682.pdfIn PDF document text
- http://dharmapremipariwar.org/userfiles/file/lizafujitivoxebu.pdfIn PDF document text
- http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdbf765023c---25720177498.pdfIn PDF document text
- http://cancunday.com/travela/img/files/82678406479.pdfIn PDF document text
- https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f146cca941a---maralexewifanopar.pdfIn PDF document text
- https://horacebatten.com/ckfinder/userfiles/files/lurorupovig.pdfIn PDF document text
- http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160838a5c30d52---41683278415.pdfIn PDF document text
- https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/8ba855d62170fa004be87826e95a0ef3/nijiwenenele.pdfIn PDF document text
- http://greenbiotech.vn/uploads/userfiles/file/55327597796.pdfIn PDF document text
- http://zimaletto.com/uploads/file/73008374271.pdfIn PDF document text
- http://asiancfea.org/userfiles/file/90948750195.pdfIn PDF document text
- http://alpanelektrik.com/depo/sayfaresim/file/71250547767.pdfIn PDF document text
- https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/694c3688a15abe6e429f7a1be298ca04/nesafateji.pdfIn PDF document text
- https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/a9b9aae924298aa20fd86bc7ee29057c/judigajogu.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=neuralgia+del+trigemino+tratamiento+fisioterapia+pdfPDF 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_off0000b8dc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB8DC	10920 bytes
SHA-256: `d31d2aff951de04ebcddee5feb4c885db3687371c31d07e7f19e53c151c915ab`
`font_01_sfnt_off0000d1e6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD1E6	15796 bytes
SHA-256: `a180a06561da325c92192440de18af2d5b4a1995ca89a1986bc32e2e67eadb01`
`font_02_sfnt_off0000f8e2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF8E2	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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