PDF malware analysis — malicious · 534d413411230b1b

MALICIOUS

PDF

119.2 KB Created: 2021-08-07 12:59:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 80d6c7b5c51cba0fe18cc2a0a6bcbd0a SHA-1: 4f685f1fc5910e2180d29c59b73e0c77d1c64951 SHA-256: 534d413411230b1be54bfcb8ae2db442058ecbcdab7074c581c4bc36d96074ed

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for malicious PDFs to execute code or redirect users. The heuristics indicate that the PDF is part of a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9963

Heuristics 7

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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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 http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c68a7f30c2f---kigenonufeta.pdf In PDF document text
- http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16099eb521058a---47935034546.pdfIn PDF document text
- http://gayaarchi.com/userfiles/file/20210722135137.pdfIn PDF document text
- http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091cbfc7e3ad---14801962707.pdfIn PDF document text
- https://prtl.pl/userfiles/file/7246895953.pdfIn PDF document text
- https://residenciasanamaro.es/userfiles/files/ruduxasofogeninijorulago.pdfIn PDF document text
- http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744627acf75---95160495503.pdfIn PDF document text
- http://usaoxin.com/userfiles/2021-5/file/sezimomaxip.pdfIn PDF document text
- http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7975593ece---sonoxokebawijuzafixix.pdfIn PDF document text
- https://festival.bg/fckeditorfiles/file/zanorumirotovug.pdfIn PDF document text
- http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/72906911120.pdfIn PDF document text
- http://www.impactit.in/ckfinder/userfiles/files/85729145128.pdfIn PDF document text
- http://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1627407404.pdfIn PDF document text
- https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/cipi677dqqbof84dvuqfqci9rj/vifewubajolelur.pdfIn PDF document text
- http://sherwoodchambergolf.com/ckfinder/userfiles/files/videtuxepawiv.pdfIn PDF document text
- http://dsagco.com/Upload/file/61364090910.pdfIn PDF document text
- http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b4fa7140c04---23218312497.pdfIn PDF document text
- https://accesoriosalmayor.com/images/userfiles/file/nipurukudubomiximawem.pdfIn PDF document text
- http://dragonspond.com/uploads/files/vanisodaxuxumedudi.pdfIn PDF document text
- https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/1fa66018d3bd2104b4ecff0d286070ab/zogavimewupefajafumotupu.pdfIn PDF document text
- http://watdoenwevandaag.nl/upload/2201832898.pdfIn PDF document text
- https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b357377f651---nopivadoletufapesibenedo.pdfIn PDF document text
- https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/7c5de23422a43d337138982d234f23fd/21190514948.pdfIn PDF document text
- https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/np1lh7ssvqvbd9ta2arjeq7tkm/84752887930.pdfIn PDF document text
- http://falconartistmanagement.com/ckfinder/userfiles/files/20753369876.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=idgam%C4%B1+bila+gunne+nedir+ve+%C3%B6rnekleriPDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_007_off0001931d.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1931D	32412 bytes
SHA-256: `4a5421e437f8d9f31206753c79c5fcc7eba0e2f9bfe967a589abb31cb46cfa2e`
`font_00_sfnt_off00012f5e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12F5E	21768 bytes
SHA-256: `af36c294a437adf4510588a883752ff1e790b4f82496fc6dc66e19343ebb9314`
`font_01_sfnt_off00016294.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x16294	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00017aab.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x17AAB	10816 bytes
SHA-256: `77a201f74a646eb8b3d8aee65517b6e19feb917eb017cc0f15e97a9761d29d29`

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