PDF malware analysis — malicious · b98d28461ed7a562

MALICIOUS

PDF

80.7 KB Created: 2021-09-01 06:36:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 9da2aa9c979ae8d084d66f0d2ef9365f SHA-1: 012c4ac247939dffb965c6d5789121457acd522c SHA-256: b98d28461ed7a5626725c466a94f480a28ef3e44677230704676e8e53bdcfadf

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's part of a phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9846

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://ip-kamera-rendszer.hu/ckfinder/userfiles/files/pubonidurekipaxalul.pdf In PDF document text
- https://seerupit.dk/assens/file/rakobakikiwenukexoz.pdfIn PDF document text
- http://gbfrjournal.org/pds/userfiles/files/lajugutamalikikofa.pdfIn PDF document text
- http://curry-box-deluxe.de/userfiles/file/591555944.pdfIn PDF document text
- http://stavo-bazar.cz/userfiles/file/94069566714.pdfIn PDF document text
- http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609876eee992e---33165158347.pdfIn PDF document text
- http://dakmoto.cz/obrazky/file/32182273732.pdfIn PDF document text
- https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160890666c8561---rakikapigobipifewavina.pdfIn PDF document text
- http://uspeh-kursk.ru/ckfinder/userfiles/files/tikovoxinonifekutawedur.pdfIn PDF document text
- https://nadrozmerne-sklo.cz/uploads/24468647486.pdfIn PDF document text
- http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1609110223c77e---dofajeraxik.pdfIn PDF document text
- https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/0c711845dcb821c2368e75475d372769/28190259041.pdfIn PDF document text
- https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/a6acb6a63ab100a746c82837e93bb0bb/tibaj.pdfIn PDF document text
- http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e054cc89fc4---jubuvovexuzenuwovazefi.pdfIn PDF document text
- https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/eca215c86e5th28k63kplnr8kj/sijola.pdfIn PDF document text
- http://asckhn.com/acskhn/userfiles/file/zopirejovib.pdfIn PDF document text
- http://yourbuilding.ru/userfiles/files/fegiwinewemoku.pdfIn PDF document text
- http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/h62brh5ksleo8ho4vhck6solu6/jijupitisikopagonidejufas.pdfIn PDF document text
- http://hf1968.com/clients/48820/File/10512778525.pdfIn PDF document text
- https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/d67419b7451c66e45e6111767aefc1cc/71578423529.pdfIn PDF document text
- https://fsreloading.com/userfiles/files/95036906845.pdfIn PDF document text
- https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/2ihpqog8h3p9c52dfu4fu6je2c/11511413325.pdfIn PDF document text
- https://debo-fit.be/userfiles/file///26292135643.pdfIn PDF document text
- http://carsongrad75.com/clients/3/35/35717660c32d3dd9b0ffde8f33a19d23/File/remoxerab.pdfIn PDF document text
- https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f7df8c8bb---furezafilixagusok.pdfIn PDF document text
- http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bb699882732---76408697542.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=have+an+open+mind+meaningPDF 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_off0000d736.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD736	10380 bytes
SHA-256: `569c66beac0f85e0570fd5a3f52cbb107bb6bdd3902ffe201ac3f12daf1d773b`
`font_01_sfnt_off0000ee5b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEE5B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001066d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1066D	18188 bytes
SHA-256: `759098f03b84048b2c56bac0b9b4f23d4f025b962d8f120864bd80b7f054e38f`

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