PDF malware analysis — malicious · 91e1795ee09538b6

MALICIOUS

PDF

87.6 KB Created: 2021-08-07 08:56:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 0c92422d47c84a2162d8d57805c4967a SHA-1: f77b77cdbb8fa7d0ca90775d208b91449ebce4fd SHA-256: 91e1795ee09538b6524fd3b84267a6ce3d45d0635d576d1fe8d21f4b8ce90394

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly indicate the document's purpose is to redirect users to potentially harmful content.

Machine Learning

Nyx PDF Classifier malicious score 0.9957

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://infrive.ru/uplcv?utm_term=can+you+bathe+a+guinea+pig+with+human+shampoo PDF link annotation
- http://ebslang.net/_UploadFile/Images/file/33897661043.pdfIn PDF document text
- https://kcharp.com/ckfinder/userfiles/files/pilarutuduxosufijeladeton.pdfIn PDF document text
- http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a41fba2bedc---29554500193.pdfIn PDF document text
- http://ucity69.com/clients/861769/File/86370012043.pdfIn PDF document text
- http://www.dreamstoreonline.es/ckfinder/userfiles/files/donazene.pdfIn PDF document text
- https://venefoil.com/ckfinder/userfiles/files/nitonozalinezevex.pdfIn PDF document text
- https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/7kagrf1tna6tn2e7dfs4uit4oc/ninapewumi.pdfIn PDF document text
- https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/b6716bea9843a263f72656c80ddca117/mevaxenadamuvo.pdfIn PDF document text
- https://ochronaskory.pl/pliki_user/File/68975611988.pdfIn PDF document text
- http://faw-asia.com/image/upload/files/17903042732.pdfIn PDF document text
- https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/950ad0c9689c632d10fcd9d350ab758a/41764954754.pdfIn PDF document text
- http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764cce71306---67477689663.pdfIn PDF document text
- https://kingcarmotorista.net/uploads/files/kedabewixinujizumut.pdfIn PDF document text
- http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ad81e251603---2313491926.pdfIn PDF document text
- http://www.ez4parcel.net/upfile/files/2021/08/03/dilosasob.pdfIn PDF document text
- http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/b849751e49dc7d801f5735436cdec3f6/71360671459.pdfIn PDF document text
- https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/386e9474ac1fef35cf6a968afe906839/26845098053.pdfIn PDF document text
- http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/3j3g32guv93a914v4cv91bd3s5/fenukizidekutorogexixew.pdfIn PDF document text
- https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/9026ac550cc94817b397796ec5917629/noxuresosaxezererebovaba.pdfIn PDF document text
- http://bereanbaptistashton.com/clients/1/1c/1ca8668e480cca1e897b6add33210fc6/File/lejugevutelidamorelip.pdfIn PDF document text
- http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/tatarosetusov.pdfIn PDF document text
- https://communeouchamps.fr/userfiles/file/76148395692.pdfIn PDF document text
- http://ancient-theater.gr/media/file/28095736261.pdfIn PDF document text
- http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4d90f0069---lumovowiwapiwol.pdfIn PDF document text
- https://jxloanchien.com/style/postimage/file/kuwenasasifaja.pdfIn PDF document text
- https://denizlihorozu.com/resimler/files/69796530699.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_off0000f05b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF05B	11024 bytes
SHA-256: `814d1e05c5c6b3a810fa6adf6ba3a664f0a0765adb666270b0216fac252697bd`
`font_01_sfnt_off000109ba.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x109BA	17028 bytes
SHA-256: `3f83a6a8368bd45428fcdb72c89e781cc9807dacae0e8238c3e66983384fd523`
`font_02_sfnt_off000135f5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x135F5	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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