PDF malware analysis — malicious · 28fab3287afbce3f

MALICIOUS

PDF

85.4 KB Created: 2021-07-14 10:23:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: cf2553ac731ba3566fa57fbd7f4282b6 SHA-1: 8afd01d939f3834f708508b7594603e19241837f SHA-256: 28fab3287afbce3f1b497cefc1c9b42350ba2b3a53f44c2f355e9a21f4d8ec29

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely intended to deliver a second-stage payload or phish credentials.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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://oniceh.ru/uplcv?utm_term=rent+contract+renewal PDF link annotation
- http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/8e871e2a969b4dce85948933da10452f/25947245346.pdfIn PDF document text
- https://bem-sa.com/img/file/vejif.pdfIn PDF document text
- http://ahxxzx.com/userfiles/202105/file/4306939397.pdfIn PDF document text
- http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076fd25e6ce6---1837625657.pdfIn PDF document text
- https://stopserv.ru/files/file/jitasosaleretelakuzet.pdfIn PDF document text
- http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b54bc4848de---tizokivafudebaxofite.pdfIn PDF document text
- https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4e7c8a225---45639983273.pdfIn PDF document text
- https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/h9m6dccncg9odjnsfn40d49f8q/41900232216.pdfIn PDF document text
- https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/d9f8ac8c59da5a40337eb78d8a446f56/fizujodutil.pdfIn PDF document text
- https://daaeportrett.no/upload/file/muzesojupigatefum.pdfIn PDF document text
- https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/953078467c1b45cb1ccc46720b59f670/39957556393.pdfIn PDF document text
- https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/94d01f62e8febcf66126b5df1079194a/dokelolikusov.pdfIn PDF document text
- http://email-database.info/userfiles/file/zugurumojelakezo.pdfIn PDF document text
- http://smeclassof1987reunion.com/clients/37165/File/86445737387.pdfIn PDF document text
- http://muzeumostrowiec.pl/obrazy/file/74630590415.pdfIn PDF document text
- http://premiercontractinginc.com/files/file/jefumapibiburatavux.pdfIn PDF document text
- https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbf1966240---xowibiwi.pdfIn PDF document text
- http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c9fe65453---pemiveni.pdfIn PDF document text
- http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087217c00589---fefejozemadexoxese.pdfIn PDF document text
- https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/0e91632420fd83fb497c78490821fa2b/debumilojalamaral.pdfIn PDF document text
- http://le-lemniscus-incandescent.fr/ckeditor/upload/files/bofuj.pdfIn PDF document text
- http://sjar-tech.com/uploadfile/file///2021061813532982.pdfIn PDF document text
- http://vhktn.at/images/content/files/94913850176.pdfIn PDF document text
- https://haps.company/wp-content/plugins/super-forms/uploads/php/files/8cfsfce32k44lq67m1rmr7kbe0/5149051973.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_off0000ed17.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xED17	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010529.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10529	17128 bytes
SHA-256: `7895a096b8e8fe4f5bef8a4d6e1d7c9e1b7aca46721f4881fb7e4b28b66148d6`
`font_02_sfnt_off000131e3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x131E3	10096 bytes
SHA-256: `5907308dd7d6475d4cdbf93f3cce9657d42d26eda9234440653cb3a15b34ce48`

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