PDF malware analysis — malicious · fbeff21add6a3208

MALICIOUS

PDF

78.4 KB Created: 2021-09-14 06:55:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: eddb3330ece9a9bc36568dc2b44b178d SHA-1: b5b31e271ff1a9286046c6bd28c32aca57c2bffb SHA-256: fbeff21add6a32080c9bd0cc6b94e9a9610e9d2923f2c1cde9ea8a12c6e8104b

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to domains associated with link farms or compromised content management systems. The ML classifier strongly indicates maliciousness, and the presence of numerous external links suggests an attempt to redirect users to malicious sites for phishing or malware delivery. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and ML classification.

Machine Learning

Nyx PDF Classifier malicious score 0.9985

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://inwebjor.ru/uplcv?utm_term=zxing+android+gradle PDF link annotation
- http://elektrostroy.kz/ckfinder/userfiles/files/sadugelix.pdfIn PDF document text
- http://jtipartner.com/ckfinder/userfiles/files/48747892100.pdfIn PDF document text
- http://resortvillairene.it/userfiles/files/80263746533.pdfIn PDF document text
- http://culfordequestriancentre.org/UserFiles/file/gopepibu.pdfIn PDF document text
- http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380442921aa---lotimudezaludorivefuviwi.pdfIn PDF document text
- http://chinazzjx.com/d/files/sexugopimasejitojamudo.pdfIn PDF document text
- http://pekingtogo.com/uploads/files/29356544584.pdfIn PDF document text
- https://a1-recruitment.fr/v2011/Files/fck_upload/file/rulijejedilutema.pdfIn PDF document text
- http://pngroup.pl/ckfinder/userfiles/files/94421592793.pdfIn PDF document text
- https://turdv.ru/SITE/files/editor/file/pozotifudakidu.pdfIn PDF document text
- https://ldcpc.com/ckfinder/userfiles/files/57669056301.pdfIn PDF document text
- http://transcash.com/ci/userfiles/files/11395718578.pdfIn PDF document text
- https://gabinetpro.pl/kosmetyczka/krakow/files/92507107798.pdfIn PDF document text
- https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16134dcc89eda5---dopuzaf.pdfIn PDF document text
- http://barcelonahotel.vn/UpLoadFile/file/64484007164.pdfIn PDF document text
- https://acconpriti.com/ckfinder/userfiles/files/segirofuduk.pdfIn PDF document text
- http://oilmachineydy.com/d/files/xedajuvurepanuruwe.pdfIn PDF document text
- https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/c43hnf2uio836p77lnu4le0kg4/3204737974.pdfIn PDF document text
- https://value.ae/userfiles/file/gulejufeligex.pdfIn PDF document text
- https://shoppingplanet.ro/ckfinder/userfiles/files/gelowidedi.pdfIn PDF document text
- http://kompassztuki.pl/Image/files/vovesexenalizorusinugew.pdfIn PDF document text
- 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_off0000c56e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC56E	21492 bytes
SHA-256: `425e52633b340c56888a0a0ef24e2acb60249d7de5f6f622be31f43373e81d86`
`font_01_sfnt_off0000fd73.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFD73	10220 bytes
SHA-256: `9c588e0beb1aa2a7f97857c19d60d74cf6f679494c4fa04d2ab8793f4f912b9f`
`font_02_sfnt_off00011440.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11440	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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