PDF malware analysis — malicious · a5a0a1eeb379db76

MALICIOUS

PDF

75.2 KB Created: 2021-09-05 17:26:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 40c53f243291604727d28f96c79461ec SHA-1: 32b329271663c99cbd638b72e537f5381b745cd9 SHA-256: a5a0a1eeb379db76e2d21453f0225c73752be1ccc90b0a2cfa82a81a53485c34

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to potentially compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the PDF structure itself are indicative of a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9840

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://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/f2c7bc3e4f69c9cbc04c588ef62a6f2b/birixanixinukigizu.pdf In PDF document text
- http://cochemical.com/upload/files/81695978720.pdfIn PDF document text
- https://globalmediaminds.com/uploads/files/nadusikilipasifizewakadu.pdfIn PDF document text
- http://wsm.hk/images/uploadfiles/file/fejuwefuwogumijogewojurod.pdfIn PDF document text
- http://amajyuku.com/files/files/66716817720.pdfIn PDF document text
- http://campfirewtx.org/userfiles/file/53520024189.pdfIn PDF document text
- http://lycee-elm.org/userfiles/file/rijozes.pdfIn PDF document text
- https://interangkorcondominium.com/userfiles/file/34226087275.pdfIn PDF document text
- http://saovietgroup.com/upload/FCK/file/2561427662.pdfIn PDF document text
- https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075faa0a4226---dupujobuwewupegegivoxerow.pdfIn PDF document text
- http://hyswimpool.com/userfiles/vebigufoturige.pdfIn PDF document text
- http://kayamedbursa.com/userfiles/file/2099356890.pdfIn PDF document text
- https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/41254f9d01910307c4d30901535b43f9/16651853539.pdfIn PDF document text
- https://standsimulator.com/ckfinder/userfiles/files/bowolewumigivirek.pdfIn PDF document text
- https://mraos.com/web/userfiles/file/17779307639.pdfIn PDF document text
- http://ever-pioneer.com/upload/files/92514052447.pdfIn PDF document text
- http://ovodatar.hu/userfiles/file/38660797912.pdfIn PDF document text
- https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/jo667fa9dc0aquuoq07jje2b36/1978602564.pdfIn PDF document text
- http://degrossier.nl/uploads/file/86978181771.pdfIn PDF document text
- https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608030f1c64eb---kewipifanopavubu.pdfIn PDF document text
- http://tplustech.com/images/ckeditor/files/kixoku.pdfIn PDF document text
- http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/ccb68d84affbcc0677b6628e05acbf3a/91515883402.pdfIn PDF document text
- http://sl-light.ru/design/img/upload/file/kipikapilidirasabemubada.pdfIn PDF document text
- https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c602fad1d08---11517078249.pdfIn PDF document text
- http://gidaero.com/upload/fckeditor/file/ledobidikoronokunono.pdfIn PDF document text
- http://clinicaveterinariaalbese.eu/userfiles/files/fewikefanowatizokezisuv.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=jurnal+internasional+hepatitis+a+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_off0000c5d7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC5D7	16088 bytes
SHA-256: `9c65225388c1a9cee220480abddc0f5465b31de7b03b21ad5f0d689f31af613e`
`font_01_sfnt_off0000eed8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEED8	10684 bytes
SHA-256: `682255c78216aa01059fa3b84b5c3f9595076b8a6f3e9be33cd1d8274973b877`
`font_02_sfnt_off00010741.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10741	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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