PDF malware analysis — malicious · 352984fa85f31da4

MALICIOUS

PDF

93.9 KB Created: 2021-07-01 22:22:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23

MD5: 472a4a5829ed546c03b89187ecd02fb6 SHA-1: 5fe7a629ce15a57f845b8eba3a11cee387693abd SHA-256: 352984fa85f31da44147ca8619a9ab6d31c44798742eb036c7292d71e01d6566

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

Nyx PDF Classifier malicious score 0.9991

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://floraplant.gr/FCKeditor/userimages/file/minusitoreb.pdf In PDF document text
- https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c47ba9ebf1a---44974823269.pdfIn PDF document text
- https://personnelcle.com/userfiles/file/rasumubil.pdfIn PDF document text
- https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a8e616317---46711017956.pdfIn PDF document text
- http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707d39761bc---3343842661.pdfIn PDF document text
- https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/b44f7c65e216d699b1331fd36a0c9cb1/saligivafizetokat.pdfIn PDF document text
- http://petersonspann.com/clients/3/32/32c4b2f41fa698b5b938e848169c8dcb/File/49332140671.pdfIn PDF document text
- https://arerp.kr/data/file///vexakizudukij.pdfIn PDF document text
- https://akproauto.com/nbloom/fckuploads/file/maguzusenamafijukojene.pdfIn PDF document text
- http://chinajessie.com/seadata/data/uploads/img/file/162242339925.pdfIn PDF document text
- http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/5b846f98a1eb74dbae89c076643b60cc/nulelizabugulegew.pdfIn PDF document text
- https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/3603503c24e2899b268b91375ab4e571/26594827183.pdfIn PDF document text
- http://onnetsolution.in/userfiles/file/tuzuduzujomagujebat.pdfIn PDF document text
- https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/dr2ck2r1tpoheohsk0jk8m25dh/nakusuto.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c15c0d530---86620204138.pdfIn PDF document text
- http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1cce064c7---9587740221.pdfIn PDF document text
- http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b45c1e73e56---logulafojutifa.pdfIn PDF document text
- https://cafe-malaysia.com/contents/file/sexaluwugupivoduwix.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=git+submodule+download+allPDF 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_off00010a5c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10A5C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00012273.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12273	10676 bytes
SHA-256: `c95fb2c48a547be093939d03b11ad443bd66008999436d8872d9410e9eb69fe3`
`font_02_sfnt_off00013b01.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13B01	17932 bytes
SHA-256: `d2c5154baa47758a50ee7317fca4e45e380faa85b6779c5d9ce08bfeb8636bdb`

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