PDF malware analysis — malicious · 4f2849d692f9e475

MALICIOUS

PDF

77.2 KB Created: 2021-08-20 15:20:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 3c96067c6bb6769ac1c3bac9c3f9f802 SHA-1: 0779055ba0961d7d347dabf6d1f120b1be6e1377 SHA-256: 4f2849d692f9e4759d82f245e447b2640dd155a6b6e0b488bc693a09ff31acc8

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish for credentials. The document body is unreadable, but the heuristic firings strongly indicate a malicious intent to redirect users to external sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9934

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
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 https://yz-yongzhong.com/upfiles/editor/files/danodokosofopikatizor.pdf In PDF document text
- https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160978a258f2d9---92801713652.pdfIn PDF document text
- https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/2272007d165cfaf689fc5e2478de67de/21443076967.pdfIn PDF document text
- https://kisikana.hr/userfiles/file/zuwileruragukuk.pdfIn PDF document text
- https://tramhuonghanoi.vn/upload/files/86591375010.pdfIn PDF document text
- http://makingthegradetexas.com/clients/d/d4/d4716c73f098ea79da165a2194b6736a/File/dumowonadosof.pdfIn PDF document text
- https://area34.info/wp-content/plugins/super-forms/uploads/php/files/v2linod71r69tkstbcro9eii62/39072872585.pdfIn PDF document text
- https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/544cd34955d2c7a4dc494f5db23e3674/387045684.pdfIn PDF document text
- http://secretinvitation.net/images/files/kowuk.pdfIn PDF document text
- https://aduanaldelvalle.com/userfiles/file/femelewukudedupikob.pdfIn PDF document text
- http://lagrupacio.cat/file/mesajojute.pdfIn PDF document text
- https://wecareprogram.org/images/file/jukofuv.pdfIn PDF document text
- http://lexen.ca/userfiles/files/derukobizoxat.pdfIn PDF document text
- http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/q3qiq682d3fultm5tvrsoerlu6/punakajogivewiw.pdfIn PDF document text
- https://zlatartopalovic.rs//files/nirerijefazukadujagam.pdfIn PDF document text
- https://edusfera.pl/upload/file/lukelawebiped.pdfIn PDF document text
- http://martom24.pl/martom/userfiles/file/wexumuninurufidofuviki.pdfIn PDF document text
- http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073de284bc73---dazozadoravud.pdfIn PDF document text
- https://danielfelber.ch/userfiles/file/pabegagen.pdfIn PDF document text
- https://thefertilizergranulator.com/d/files/31938004701.pdfIn PDF document text
- https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/d8539f028120b6feb707033f1a798190/69997639371.pdfIn PDF document text
- http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/lupijixojadefotiju.pdfIn PDF document text
- http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bec3e0a9c30---kabud.pdfIn PDF document text
- https://noihoithanhtuan.com/media/ftp/file/91355376076.pdfIn PDF document text
- https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/0lv1o5h45uae8povbfoeudom0r/dibaw.pdfIn PDF document text
- https://vieclamkinhdoanh247.com/upload/files/39440993632.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=exercice+sur+les+additions+et+soustractions+de+nombres+relatifsPDF 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_off0000c7b4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC7B4	16720 bytes
SHA-256: `0df77f26d04dd1ba26462d67956821250732283c4dd4ee9b7680892d76b98a86`
`font_01_sfnt_off0000f1f3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF1F3	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010a0a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10A0A	10960 bytes
SHA-256: `409727f2f839ca9a7e8f77b142e1f68527981b536e284e9b5c1633201e447783`

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