PDF malware analysis — malicious · f04823c4fd334105

MALICIOUS

PDF

81.5 KB Created: 2021-09-08 02:22:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 7b0da918cef1dfab53f40bc4c17fc223 SHA-1: 8f034b4d0c33d4096c5baa59313224f1d07a2c29 SHA-256: f04823c4fd33410527f18ab097c0a840ee592dd89898d6842d152a7774371724

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs and link farms pointing to compromised WordPress sites and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure itself is designed to lure users to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9949

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://wastran.ru/uplcv?utm_term=bandura+1977+self+efficacy+pdf PDF link annotation
- https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/gnruhmelvl7libg5ffesecn8h2/fobaxugelovogavev.pdfIn PDF document text
- http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/witexese.pdfIn PDF document text
- https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107b198b9618---69160641898.pdfIn PDF document text
- http://bigband-ulm.de/userfiles/files/25329356915.pdfIn PDF document text
- http://wjcopy.com/upload/files/katutapajudan.pdfIn PDF document text
- http://samtekelektrik.com/files/nobugunularuj.pdfIn PDF document text
- http://robalton.es/Albums/images/file///15658709522.pdfIn PDF document text
- https://tecnicadovolante.com/images/file/47405958243.pdfIn PDF document text
- http://ninda.vn/userfiles/files/65523323201.pdfIn PDF document text
- http://bon-mar.com/fck_user_files/file/norivadogarerofovuken.pdfIn PDF document text
- http://basumati.com/app/webroot/ckfinder/userfiles/files/gatumive.pdfIn PDF document text
- https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ad9b719d2---wemakix.pdfIn PDF document text
- https://tourpon.kr/FileData/ckfinder/files/20210905_7C71ED17890F72CE.pdfIn PDF document text
- https://dejavuruse.com/userfiles/file/kurigoniguxim.pdfIn PDF document text
- http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/dgj0noa3vf6aufsreh06ucpb44/83324239669.pdfIn PDF document text
- http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2016014580---80070272754.pdfIn PDF document text
- https://intervalhousehamilton.org/ckfinder/userfiles/files/38989649327.pdfIn PDF document text
- https://forumhrdbekasi.com/webroot/userfiles/files/78319287837.pdfIn PDF document text
- http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/12396535598.pdfIn PDF document text
- https://hamzsabegi60szallo.hu/UserFiles/File/suwujanimoropato.pdfIn PDF document text
- http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160e69ea8c13a0---bomorewigedelalefiza.pdfIn PDF document text
- https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2401ce633---zasuvofuvojaxobomamugupa.pdfIn PDF document text
- http://grafiport.com/userfiles/file/43829502582.pdfIn PDF document text
- https://tidaksusah.com/contents//files/rapoxuniwusedededut.pdfIn PDF document text
- https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/6277bf63031e7b76369fa0f21068a115/8361960984.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_off0000d703.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD703	18560 bytes
SHA-256: `f9b0576f5d00b782f7c16b668b2a3d78a009d24b075be3455b7012284f023d5a`
`font_01_sfnt_off000106fa.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x106FA	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011f11.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11F11	10932 bytes
SHA-256: `542d456e89de528d2491c23c3c1de79670a41fb1470939054999bd4c4270abe8`

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