PDF malware analysis — malicious · b19b4bdbf92dbe86

MALICIOUS

PDF

86.5 KB Created: 2021-06-26 00:51:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 69ece2267a0e3092aff3b889d923282d SHA-1: 6f57215929b6ed8db6ee94ca42552b57fb48b2b4 SHA-256: b19b4bdbf92dbe86afb4d88763358fcbc56553b0a41be55665023c86591350ea

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple distinct hosts, many of which are hosted on compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document designed to lure users to external sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9848

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 http://sbox-technology.com/upload/datoteke/rivelajejabimama.pdf In PDF document text
- https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822c78baec1---nozon.pdfIn PDF document text
- https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/8d58ed3d1d030fe07b190bcf1c72a975/50507253196.pdfIn PDF document text
- https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/0146746c4926815f60319187b0ad86c6/dupes.pdfIn PDF document text
- https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d7953c639---dakubabekunolewuwimaxof.pdfIn PDF document text
- http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3385bf2fa3---tuzamitubukobasomifimimov.pdfIn PDF document text
- http://hieuchuan.com/upload/files/14880113973.pdfIn PDF document text
- http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b10fa67094a---wevopogug.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5cf463b097---pipejovorekes.pdfIn PDF document text
- http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a710f01a1ef---97165546274.pdfIn PDF document text
- https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5dfb6e91ea---jigumagijexavavug.pdfIn PDF document text
- https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/ks13o078ad9gtaol22uv39ood1/95158308296.pdfIn PDF document text
- https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8d2733e3b---virutigoxorezobiza.pdfIn PDF document text
- https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/1q51mp5uu4pmp18ua6tugpsj9v/16809802354.pdfIn PDF document text
- http://caphegiabao.com/upload/fck/file/29651541626.pdfIn PDF document text
- http://dobrasekacka.cz/userfiles/file/samazewejarefe.pdfIn PDF document text
- http://ebsenglish.net/_UploadFile/Images/file/jadetaw.pdfIn PDF document text
- https://sp-pir.ru/wp-content/plugins/super-forms/uploads/php/files/a1144e3237a2fd55cc02e234645159e1/fijikesebun.pdfIn PDF document text
- http://pomocnaukowa.net/Upload/file/joxuzasivusudofigiz.pdfIn PDF document text
- https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/4cd3b825a2093610e972cb659d998d3f/pinuripazaxutenab.pdfIn PDF document text
- http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a1b719e92---zebimimeliwidonebiwiwevuj.pdfIn PDF document text
- https://stef-nancy.fr/upload/document/wivepapexokoxop.pdfIn PDF document text
- https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd9b42d772---1299537766.pdfIn PDF document text
- http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607be2ff3b032---79229984113.pdfIn PDF document text
- http://www.predia.cz/userfiles/file/zitefisanibuzazedafiguwal.pdfIn PDF document text
- http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/menic41nvd7n5h0akrlu1a82o7/90833606794.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=freehold+caravan+sites+for+salePDF 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_off0000ed00.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xED00	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010517.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10517	10616 bytes
SHA-256: `d7ead7d86217007a007d8144f65211c4d43044c7951e1f9e64d18783f26b9597`
`font_02_sfnt_off00011d48.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11D48	17956 bytes
SHA-256: `72a27f8019159aef12fbe6abaf797e7f1c58dbf8d563c875ec10159244d00fd8`

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