PDF malware analysis — malicious · 9cfe87e2c56572ed

MALICIOUS

PDF

78.2 KB Created: 2021-09-04 07:44:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 013d21e6995cbcb9735ce5f7cec36643 SHA-1: 6c08a5c83b9d37e7ff0d8218a22b3dbd27123500 SHA-256: 9cfe87e2c56572ed461352d4f712c369e797a24a65dd6d5982532b9deaaad545

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS upload directories and disposable hosting, suggesting a phishing or SEO manipulation scheme. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

Nyx PDF Classifier malicious score 0.9911

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://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729729b687e---63948153459.pdf In PDF document text
- http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fda9c88a8db---dajodaronukifipasuv.pdfIn PDF document text
- http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160787f6c7c358---sadatik.pdfIn PDF document text
- https://ubranni.com/uploader/files/bixusimozubusu.pdfIn PDF document text
- http://ibshop.gr/uploads/_uploads/files/12025571183.pdfIn PDF document text
- http://poiskvod.ru/images/file/misonafonavavasafuf.pdfIn PDF document text
- http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/45566044849.pdfIn PDF document text
- http://alpanelektrik.com/depo/sayfaresim/file/47826340470.pdfIn PDF document text
- http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/b489bcd2fe3cd68db454c405ec4a7e11/sudomedikomu.pdfIn PDF document text
- https://uzunlarpeynir.com/dursun/upload/files/38780451064.pdfIn PDF document text
- http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16125c10a5a3d2---51026021754.pdfIn PDF document text
- https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/d7afb2c1b082c1cada3181a369a9011a/70736591866.pdfIn PDF document text
- http://vivo-mebel.ru/upload/file/rimupifikenoxizubulij.pdfIn PDF document text
- https://alula.com/wp-content/plugins/super-forms/uploads/php/files/cb91d3e5d47054b0c3496a1552f56db1/19740876259.pdfIn PDF document text
- https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bda66f15e13---79045762016.pdfIn PDF document text
- http://shannonlakeestates.org/fck_images/file/4737336253.pdfIn PDF document text
- http://ikoi-es.club/yamituki-n/uploads/files/54147375656.pdfIn PDF document text
- https://bostoncake888.com/UserFiles/files/nebudotipibisufarajemun.pdfIn PDF document text
- http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16085313065bce---vozekonidezo.pdfIn PDF document text
- https://dom4m.de/userfiles/files/lavutedunatiluvemamamesub.pdfIn PDF document text
- https://jxloanchien.com/style/postimage/file/93756393051.pdfIn PDF document text
- https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/a19507fcb776fd07a43c4fe357e4a20a/88332831566.pdfIn PDF document text
- http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610825aa9847b---82619248781.pdfIn PDF document text
- http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16071cb0708e9f---27754833029.pdfIn PDF document text
- https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/2492fce310c9090663f900b9ca3e24c9/vulijaful.pdfIn PDF document text
- https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/7929c3b709e40135e31471a9ba8c6532/lafinifakutufatufasomu.pdfIn PDF document text
- https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610d6a6a7a901---71815957392.pdfIn PDF document text
- http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/4mfuer2pgsohm56lpdpbn6mu04/3949582413.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=historical+development+of+educational+technology+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_off0000cfca.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCFCA	15816 bytes
SHA-256: `9db3d1aaaf5805bff24dbfae11d94ec2f2431a29ac297221d8f082b2c746a64f`
`font_01_sfnt_off0000f7c0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF7C0	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010fd7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10FD7	11340 bytes
SHA-256: `dc8be3738d6761174871436cd5ba93cee348a2de4ac69fd27123726b4d2d2963`

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