PDF malware analysis — malicious · 4eb1e7e9596995a6

MALICIOUS

PDF

79.4 KB Created: 2021-09-02 12:33:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: be0f1df0d17d3fcfa7a62d4e7c50185f SHA-1: 4a0e1ef0c6d24135f16920231252c53a7cac5559 SHA-256: 4eb1e7e9596995a6d54056178e26ab4ffe604845a4f6ccad64b0edba5e94d578

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. This suggests a phishing or malware distribution campaign where users are lured through a seemingly legitimate document to a chain of redirects hosted on compromised infrastructure. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious intent to redirect users.

Machine Learning

Nyx PDF Classifier malicious score 0.9953

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aa754a90140---74542578959.pdf In PDF document text
- https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/6c05b10fce8ae45326a41dd3f6faf71f/62838023128.pdfIn PDF document text
- https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/4e2f4433d57020708ef835887d9e0d8a/berikifu.pdfIn PDF document text
- https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/2qt6dgv0c522viqeqlpppamt54/xijefo.pdfIn PDF document text
- https://libertyrealestate.in/ckfinder/userfiles/files/muzizalibekugukag.pdfIn PDF document text
- https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/b62eb0a55939754787e7693b3310ba3a/vilixaj.pdfIn PDF document text
- http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/48dl80u1ncvihb9u3bcstc0rn0/8885365528.pdfIn PDF document text
- http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d18e52b17c9---tugukidataga.pdfIn PDF document text
- http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85197414e7---13579239483.pdfIn PDF document text
- https://porterbrothersltd.com/app/webroot/uploads/zovoburabalevajiraxeg.pdfIn PDF document text
- https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/a163a923779efc531d55d864eeec64c3/xalowoturedikefumozosipov.pdfIn PDF document text
- https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/34341f17af9387e9fadc9579f80c9d03/97118266748.pdfIn PDF document text
- http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160968eb872db3---33726013261.pdfIn PDF document text
- https://ustunbilgisayar.com/userfiles/files/12574120174.pdfIn PDF document text
- https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/du9e4gd8nqf61bl6id4inqu2eq/zabenibibowebipupugave.pdfIn PDF document text
- https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/a2c403e49addd15a7183d6ec9bf796b6/gonajudiwisorukar.pdfIn PDF document text
- http://foreverymuslim.net/home1/forevev3/public_html/foreverymuslim/upload/file/32056856080.pdfIn PDF document text
- https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aabc12ccdd7---rejuli.pdfIn PDF document text
- https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/9c1e92a851b31201030c347f4b0fe73f/5936854743.pdfIn PDF document text
- http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1609d44ad97778---mararow.pdfIn PDF document text
- http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984d82be9af---kufujot.pdfIn PDF document text
- http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/4794350481.pdfIn PDF document text
- http://zae.me/datafiles/file/38378995342.pdfIn PDF document text
- http://hopkins1983.com/clients/861771/File/83470709670.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=gas+chromatography+journal+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_off0000cf53.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCF53	11228 bytes
SHA-256: `122822b5293ca2c8c1805c344fb440a77778c2dbc9e66c086ee98d47a317ca7d`
`font_01_sfnt_off0000e95c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE95C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001016e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1016E	17880 bytes
SHA-256: `557604a00d0ed83067aaee436537045d531b1b04a688947d51b6d8c22fd62a67`

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