PDF malware analysis — malicious · a09bc8e6ee9940ae

MALICIOUS

PDF

89.5 KB Created: 2021-08-12 19:25:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 1efa0e3f8853e5e9f9d1a6a52e7a795d SHA-1: ee066b9e4c52bdc6d0b56bc6ce8d74f50c9330d0 SHA-256: a09bc8e6ee9940aed20cf53b3a7ed57144eed46aa3ea6953ea68a5f0798512aa

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple domains, many of which appear to be compromised WordPress sites used for hosting PDF files. The presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to malicious content or for SEO poisoning. No scripts were extracted, but the PDF structure itself is leveraged for malicious redirection.

Machine Learning

Nyx PDF Classifier malicious score 0.9761

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/pp0djh8ogs2gc220fvs2rkvv7g/fubulemetup.pdf In PDF document text
- http://nhs1966reunion.com/clients/1/1c/1ca8f1639ee69cd7806809ed3bcda9bb/File/50770820320.pdfIn PDF document text
- http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f60374aa2a---wunis.pdfIn PDF document text
- http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807dfc2d6b2---bitimeb.pdfIn PDF document text
- http://accessprecision.com/userfiles/file/9758448448.pdfIn PDF document text
- https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/34tbjnihep19nh2e2o1kdbnck3/27869292010.pdfIn PDF document text
- https://weilaimachinery.com/userfiles/files/12577899586.pdfIn PDF document text
- https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/dd6226928a2b3ea3a977ecfe4b6ffddf/9822242494.pdfIn PDF document text
- https://educhina.mn/editor/files/jurawoxukab.pdfIn PDF document text
- https://mavibusiness.it/file/kifotesuweroj.pdfIn PDF document text
- http://nessium.fr/userfiles/file/rezasetemavarepudusule.pdfIn PDF document text
- http://cochu.net/resimler/files/8669096813.pdfIn PDF document text
- https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/fb1eb998b93c5758a0ef0e9fa50e9083/32506658364.pdfIn PDF document text
- http://budohurtsa.pl/userfiles/file/nifoladumiligelunupekujog.pdfIn PDF document text
- http://gesundimjob.at/images/content/files/gonawivowalotodipu.pdfIn PDF document text
- http://vintageguitar.ru/ckfinder/userfiles/files/rikebugomuvepibanul.pdfIn PDF document text
- https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c483ef2a485---1340914320.pdfIn PDF document text
- https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/cfd219c7112682785fce854febdbf121/36289045305.pdfIn PDF document text
- https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ce3aff57005---36289351610.pdfIn PDF document text
- http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608776108e1e2---lirosamokufekekirol.pdfIn PDF document text
- http://morgancountyoh.com/userimages/lalemixunejuxaminelunofar.pdfIn PDF document text
- http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d080eaac552---29739112434.pdfIn PDF document text
- http://handbook.hu/upload/page/file/98882471172.pdfIn PDF document text
- http://fundraisingwebsites.com/clients/9/96/963d931f30a9d2280975e71a7f923c96/File/zogibikisepudura.pdfIn PDF document text
- https://faprosid.com/file/24391017445.pdfIn PDF document text
- http://hrjok.com/uploadfile/file/15338293513.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=ejercicios+de+condensadores+con+dielectrico+resueltosPDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_003_off0000dc53.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xDC53	19448 bytes
SHA-256: `bc8d4835751fb08b273e1d1705cada914b03757209d2664a4e430571831b4e66`
`font_01_sfnt_off00010ee2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10EE2	16344 bytes
SHA-256: `5cd8a120e106fc2d4fc1855603a636a3ce922decfb1b4d98f17a4a5450337c58`
`font_02_sfnt_off000124db.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x124DB	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off00013cf2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13CF2	10576 bytes
SHA-256: `43170bfccce9617371a6191beb6880c3e332ca42dd0ba87417344429b13866a9`

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