PDF malware analysis — malicious · c28b75d31e765f45

MALICIOUS

PDF

149.5 KB Created: 2021-09-07 12:19:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 8d7be604779ebb581330780da06a28db SHA-1: 55fc3fd0b8c8dffef055738ca2850ee1987c626c SHA-256: c28b75d31e765f45ecb642ca30a2e1b2f2f950465cfbe2b5ae12ddfbaf9ad9f5

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

Nyx PDF Classifier malicious score 0.9970

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 http://jew66.cn/fckimg/file/boxugagejegojoxasovo.pdf In PDF document text
- http://primaneighbors.com/userimages/9115750614.pdfIn PDF document text
- https://gamaconsultores.cl/upload/file/36807684366.pdfIn PDF document text
- https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b829d841d8a---xutizavagazikilebigo.pdfIn PDF document text
- http://www.first-classlogistics.com/image/upload/File/gisobowivinuta.pdfIn PDF document text
- https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/1cfb1b482f3dae6e361c0edbbdc5a8d5/gejuxofana.pdfIn PDF document text
- https://karlschool.org/uploads/files/202108161747397610.pdfIn PDF document text
- http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886d11d0c69---watumedurunade.pdfIn PDF document text
- https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/9qp2i8vsedipjmlqp7u4707vg1/maxodo.pdfIn PDF document text
- https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/7i697tsu6pbtd8jl6514s7m16k/zovijivugabusamopevagejol.pdfIn PDF document text
- https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/7b8221bb723f3cf462b6c10caa65c877/98675374344.pdfIn PDF document text
- http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a90fe97c1d9---xobagi.pdfIn PDF document text
- https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160baaa753e1ec---rajutesafo.pdfIn PDF document text
- http://praxis-greve-polley.de/web/editor/files/suwixakumoxutejoje.pdfIn PDF document text
- https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b29ac890ca---72824053917.pdfIn PDF document text
- https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798e45575d2---fifupizeteforodox.pdfIn PDF document text
- https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160e5f9b099201---58702866853.pdfIn PDF document text
- http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16074f8d2456cd---49880530308.pdfIn PDF document text
- http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/0294c695cba5e3cd563f07c83eafb8b1/3511077112.pdfIn PDF document text
- https://wolfgang-photography.com/userfiles/files/55806011526.pdfIn PDF document text
- https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/8fb583d4db7fcb8f2b7bebc9c5031b57/4016055571.pdfIn PDF document text
- http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609499bc063f3---86493189600.pdfIn PDF document text
- https://aprilboya.com/userfiles/file/4510395296.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=little+prince+book+pdfPDF 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_off0001eb88.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1EB88	17448 bytes
SHA-256: `c000c9ba005d48abed95a04a6f66e9d12a7f6e36f03f0c0ed298642ebd57891c`
`font_01_sfnt_off00021876.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x21876	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0002308d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x2308D	10472 bytes
SHA-256: `04862f0af59db3fe3cc714a52521111a64cb9635d0d64aa2770ab801550b4f9a`

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