PDF malware analysis — malicious · 0fef673e10536176

MALICIOUS

PDF

83.9 KB Created: 2021-08-14 23:43:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31

MD5: 84fa08d1bfa87512d1c888c9298a5bb6 SHA-1: 02ef6909f9f9328eda1f28dcb5561ba0e7b78481 SHA-256: 0fef673e10536176c378c0a2f7a1cdc0b1abc6dfbd6a3afef8c42c9164187a80

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm pointing to numerous compromised websites, many of which host other PDF files. This suggests a tactic to manipulate search engine results or distribute malicious content indirectly. The ML classifier strongly indicated maliciousness, and the presence of multiple links to potentially compromised CMS upload directories reinforces this assessment.

Machine Learning

Nyx PDF Classifier malicious score 0.9986

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://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5989d4c7fc---75016965198.pdf In PDF document text
- https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/5bo5gt8geot309l6f1gq2ke4ug/80609782984.pdfIn PDF document text
- http://americansemitruckparts.com/d/files/kasoraruwogur.pdfIn PDF document text
- http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b808fd8a42---92173557596.pdfIn PDF document text
- http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d02d6854a0---rofupatage.pdfIn PDF document text
- http://agiusfuneraldirectors.com/files/file/92227283715.pdfIn PDF document text
- http://booklandbooks.com/userfiles/file/jujiwor.pdfIn PDF document text
- http://chineseclothingonline.net/File/kazakimuvewota.pdfIn PDF document text
- http://zjqzzx.com/uploadfile/file/2021071409133073499.pdfIn PDF document text
- http://kibbkw.com/uploads/files/79993994541.pdfIn PDF document text
- https://paklya.su/design/img/upload/file/jolulunowumilataji.pdfIn PDF document text
- http://brainbond.ro/userfiles/file/81236108683.pdfIn PDF document text
- http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a12c15a2f51---wagozosufiwovosisuze.pdfIn PDF document text
- https://edinburghpools.com/contents//files/2921815322.pdfIn PDF document text
- http://dailygiasi.com/uploads/userfiles/file/47781637737.pdfIn PDF document text
- https://360clothing.in/home/www360cl/public_html/uploads/images/files/28470903614.pdfIn PDF document text
- http://bawaconstructions.com/editorData/file/46280311153.pdfIn PDF document text
- http://aven.su/userfiles/file/4741366398.pdfIn PDF document text
- https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/e62f5741cff229f307e1a98849cb3d45/6368806961.pdfIn PDF document text
- https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/a8029566fa536ef32dee7b2577f8f715/sumevofofofo.pdfIn PDF document text
- https://t2sc.me/userfiles/bulipigadonuguvozupizuj.pdfIn PDF document text
- https://vanchuyenduongsat.vn/upload/files/sozef.pdfIn PDF document text
- https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/g74r6rnhh8m1l63fmcnegnl069/mexagolakurijitagadol.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=bodyguard+2018+english+subtitle+downloadPDF 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
`font_00_sfnt_off0000ca79.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCA79	16116 bytes
SHA-256: `74ea40c6abafff908ba0a862ebf25ee1d47d31f530ca964bdc695191fb21b084`
`font_01_sfnt_off0000dfd1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDFD1	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000f7e3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF7E3	17424 bytes
SHA-256: `d14a4d0cc3fecdd188ae07fa111fb67205abd92977377b7b82122be44f1144cf`
`font_03_sfnt_off00012537.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12537	11520 bytes
SHA-256: `7b82ddbf0e42bcc48d6670062cb797d86ae2a0ef2390e41e45ed0bff2ae71153`

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