PDF malware analysis — malicious · 4a71ae2d7f63087e

MALICIOUS

PDF

76.2 KB Created: 2021-09-02 19:47:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 78a81a0a5a86a95bc19723020422258c SHA-1: 7616c1afd79db0ede9189d2e9a979d14d2a59259 SHA-256: 4a71ae2d7f63087ee6308b2c9ae87967077c02a09521e6800b297cee6c9c2b64

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to potentially compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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 http://newgrids.com/userfiles/file/fibowexa.pdf In PDF document text
- http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e0fc29d92---89410041937.pdfIn PDF document text
- http://esportenerd.com/app/webroot/ckfinder/userfiles/files/58856517448.pdfIn PDF document text
- https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/f7e6ef3b9d755319b56e8505c052c4d8/42187912817.pdfIn PDF document text
- https://kurtoglumob.com/upload/file/kugurejovadelakafokuzi.pdfIn PDF document text
- https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/456574937126a51626a29b96c73953f1/62858954875.pdfIn PDF document text
- http://potya.com/gujinaw.pdfIn PDF document text
- http://ventensis.lt/public/ckfinder/userfiles/files/24751537577.pdfIn PDF document text
- https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c36479634---95246823539.pdfIn PDF document text
- https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/2fd2877f5f93d405ade3195bcd3a086c/53154271964.pdfIn PDF document text
- https://lentes123.com/aym_image/files/73592654071.pdfIn PDF document text
- http://congtyvima.com/images/Download/mesubokabisoxenevozoj.pdfIn PDF document text
- http://selfmadefilms.nl/userfiles/files/65991462107.pdfIn PDF document text
- http://museeducuir.org/upload/files/mozos.pdfIn PDF document text
- http://bastola.org/userfiles/file/vatoxavugevekeb.pdfIn PDF document text
- https://soudurelauziere.com/upload/editor/file/sixitirap.pdfIn PDF document text
- https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16090bfeb0fd8f---1240227688.pdfIn PDF document text
- http://burelomdo.com/ckfinder/userfiles/files/68866587623.pdfIn PDF document text
- http://cuacuonnhanh.vn/Images_upload/files/74325027371.pdfIn PDF document text
- https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad5427ef1c---75040844336.pdfIn PDF document text
- http://cherryontop.pl/upload/fotki/file/34570882583.pdfIn PDF document text
- http://okvin.org/userfiles/file/48258684767.pdfIn PDF document text
- http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608636e854f29---2008128147.pdfIn PDF document text
- http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/11877825870.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=lab+attendant+result+pdfPDF 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_off0000c633.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC633	17248 bytes
SHA-256: `b9db16acea94490fea83f40679c74ad22eadce8f8634dfc19e245f0b376f1258`
`font_01_sfnt_off0000f317.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF317	10476 bytes
SHA-256: `ec37d31930ddefda2b75465d737bc85e8ce527d12336b74721de61513a4ea4d4`
`font_02_sfnt_off00010ad1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10AD1	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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