PDF malware analysis — malicious · de60bafb7e797466

MALICIOUS

PDF

97.5 KB Created: 2021-08-26 04:18:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 48e6a9f6893d75d76003095ceb6686c3 SHA-1: 34f66e9161b947790d208795b79bd4b95f6db4b7 SHA-256: de60bafb7e797466ccfc4b3a639cc862af45237162b5f762035ecb91ca10baf5

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised WordPress upload storage, suggesting it functions as a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics point towards an attack pattern involving directing users to potentially malicious external content.

Machine Learning

Nyx PDF Classifier malicious score 0.9916

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://laborke.ru/uplcv?utm_term=a+debugging+check+in+this+application PDF link annotation
- http://langeline.com/ckeditor/upload/files/24058644632.pdfIn PDF document text
- http://duetsepolno.pl/userfiles/file/6996618283.pdfIn PDF document text
- https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083cc555ddfa---7074787680.pdfIn PDF document text
- https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb95699388---77548862545.pdfIn PDF document text
- http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b810cca03fe---xedomeporusenev.pdfIn PDF document text
- http://shosholoza.de/file/mozefejolaxalusisenuno.pdfIn PDF document text
- http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078527c73a7c---puzevero.pdfIn PDF document text
- http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607346ab8a4d4---manamarupidiz.pdfIn PDF document text
- https://sankaibearing.com/userfiles/files/volujojurunurod.pdfIn PDF document text
- http://envisystem.com/upload/userfile/files/napopunozano.pdfIn PDF document text
- https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/57254c94d10f1484db3d77804873c2ef/xeguvowurawowunafe.pdfIn PDF document text
- https://mywayrtk.com/userfiles/file/pupegagunirilu.pdfIn PDF document text
- http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608499a44adc9---46189726776.pdfIn PDF document text
- https://tiklatakip.com/calisma2/files/uploads/nebeg.pdfIn PDF document text
- http://ccswcd.com/userfiles/file/58585870453.pdfIn PDF document text
- https://andrejc.si/files/file/pedekugolewuxes.pdfIn PDF document text
- http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16072778c8e050---63027949578.pdfIn PDF document text
- https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/96ff8876b034c58d4e9b17e4bf6d5bce/gobedubalato.pdfIn PDF document text
- https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/a25d57c8c0622785369d844d9dce168f/16513804866.pdfIn PDF document text
- https://ecole-anglais.com/upload/files/9717816170.pdfIn PDF document text
- https://fullgame.hu/uploads/files/62863109753.pdfIn PDF document text
- http://vincentpopetutoring.com/clients/d/dd/dd6b7bcf94cac99d3bed97cf8166637b/File/10267923692.pdfIn PDF document text
- http://soleilboo.com/images/uploads/files/gadapawurugabewakofi.pdfIn PDF document text
- https://baobihungphu.com/media/ftp/file/73519150631.pdfIn PDF document text
- http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b41639061---17226568154.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off000101d1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x101D1	17416 bytes
SHA-256: `d08d8e82a4c63aca355837551b20ea6a47cd2ef45e56a70d3c5e0080ef7b0362`
`font_01_sfnt_off00012fb3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12FB3	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000147ca.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x147CA	11004 bytes
SHA-256: `e031cfb76ed23466b896d2e240d845b480465766410d54477b67ef59c6920a17`
`font_03_sfnt_off000160e1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x160E1	16084 bytes
SHA-256: `c23a78767c17a1614fb89d96e2d4a0bb3f466bbc82d371f47e982e9626fb525c`

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