PDF malware analysis — malicious · bea88a8d7effbab7

MALICIOUS

PDF

73.4 KB Created: 2021-09-19 17:00:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 0baf29e2e3e02b85dbac3726ca9d4a33 SHA-1: 6b2bc61c43863ab643643df59a957629dd8b6a9d SHA-256: bea88a8d7effbab7f17f2c95fa7d2544fb5c6dad523a93921f11b2f135dd17ca

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs and is identified as a link farm, with many links pointing to compromised CMS upload directories. The ML classifier also flagged this PDF as malicious. While no scripts were directly extracted, the nature of the link farm suggests it is intended to lead users to potentially malicious content or phishing sites.

Machine Learning

Nyx PDF Classifier malicious score 0.6946

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
PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED

The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
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://ketchas.ru/uplcv?utm_term=the+master+guide+to+drawing+anime+download PDF link annotation
- https://thietbivesinhsonhoa.com/webroot/img/files/jawakoxovetinerufagitipa.pdfIn PDF document text
- http://zhxndl.com/uploadfiles/files/gojivurujebaxemut.pdfIn PDF document text
- https://abcoegypt.com/userfiles/files/fadutubotaxux.pdfIn PDF document text
- http://groupementpecheduloir.com/ckfinder/userfiles/files/16199500823.pdfIn PDF document text
- https://otoform.com/upload/ckfinder/files/vakupinetiwowuf.pdfIn PDF document text
- https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/161391abb2a42c---rudizutoxajivofego.pdfIn PDF document text
- http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdc5bccdea---mirowojan.pdfIn PDF document text
- http://inphilong.com/upload/files/9631064260.pdfIn PDF document text
- https://usgcambodia.com/userfiles/file/tevigagazaluvelesifujuvi.pdfIn PDF document text
- http://tecs4.com/intranet/ckfinder/userfiles/files/tagaxavuvekutesoduz.pdfIn PDF document text
- http://myucpb.com/userfiles/file/xaxuzur.pdfIn PDF document text
- http://rigosarchitects.gr/userfiles/file/13120630924.pdfIn PDF document text
- https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/pt7i4gdn49j93g230lh1f37n8l/80817543627.pdfIn PDF document text
- http://reguitti-engineering.it/userfiles/files/zofusileruv.pdfIn PDF document text
- http://kunas.lt/app/webroot/uploads/files/99380211731.pdfIn PDF document text
- https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/1de56d28bfce278f70483815084aa0d1/51111023260.pdfIn PDF document text
- http://telegid.tv/userfiles/file/kasapegenikenad.pdfIn PDF document text
- http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/tupotatamefudof.pdfIn PDF document text
- http://hebammenglueck.de/ckfinder/userfiles/files/71628164581.pdfIn PDF document text
- http://www.humillacionyestrella.org/ckfinder/userfiles/files/95245141253.pdfIn PDF document text
- https://anjingliar.com/contents/files/xinodotitobikisew.pdfIn PDF document text
- https://ce-mi.pl/uploads/userfiles/files/56414581523.pdfIn 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_off0000c703.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC703	17460 bytes
SHA-256: `0d3f05995a1ad8963479362c5d6f8e0f343e13a0bb3163de72ccc63056b18629`
`font_01_sfnt_off0000f421.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF421	10844 bytes
SHA-256: `8c7baca37f08feda0da9a109708f8c7f404114cf05672693154c6400823b737a`
`font_02_sfnt_off00010cd2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10CD2	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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