PDF malware analysis — malicious · 2d07db88159b1abf

MALICIOUS

PDF

84.3 KB Created: 2021-07-20 19:37:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: 952e7ffb7ab43e20774ff9ba726969e3 SHA-1: 71a855623d9bbea40c0e16c20077d049631a9207 SHA-256: 2d07db88159b1abfec777f22ee2200eb471fe2eb58e869d0f9e12f16a3bebfee

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1055.012 Process Injection

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm hosted on compromised WordPress sites, suggesting a phishing or redirection scheme. The presence of multiple unknown URLs further supports this, as they are likely part of the malicious infrastructure.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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 http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a08b05c0a0f---16415927731.pdf In PDF document text
- https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16086c46c116cb---funas.pdfIn PDF document text
- https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16074d3ec2aef4---2863821287.pdfIn PDF document text
- https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb447ce92c9---119984188.pdfIn PDF document text
- http://geodavidepini.it/userfiles/files/42568522090.pdfIn PDF document text
- https://100tmt.com/uploadimage/files/20210623175234.pdfIn PDF document text
- http://kbchina.de/upload/11458379008.pdfIn PDF document text
- http://aarogyamedico.com/userfiles/file/zetegixa.pdfIn PDF document text
- https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/c19c92370c24480a1f7a96e085431569/wedadabukijikemomojatiku.pdfIn PDF document text
- http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16080cd9442340---76707031620.pdfIn PDF document text
- http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f84345dcc8---83124539417.pdfIn PDF document text
- https://stallion-international.com/userfiles/file/88589689420.pdfIn PDF document text
- https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/2dh0v86vsrn3nht2333ase4v1s/mitozawetifupigalugu.pdfIn PDF document text
- http://mea-travel.pl/userfiles/file/57778257486.pdfIn PDF document text
- http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d22922b4bd---33532905918.pdfIn PDF document text
- http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/pm0rpmeoslgpua460d54c63770/lapedemu.pdfIn PDF document text
- https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/8ded46be19a46d9ef292b8f648f37845/8742316877.pdfIn PDF document text
- http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834f4cd265a---zudulobax.pdfIn PDF document text
- https://mysmartedu.com/uploadimages/files/rudosopoj.pdfIn PDF document text
- https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/5hjb17fq6o6gvktnfoq5drjbjj/tofewiza.pdfIn PDF document text
- http://gld-lining.com/user_img/files/tapamopibomi.pdfIn PDF document text
- https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16072b8a2e5a57---88144152015.pdfIn PDF document text
- https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/1f9c21af0a41765c0c3c561abdaf16f3/2561038779.pdfIn PDF document text
- http://asbu.net/uploads/FCK_files/file/37802950294.pdfIn PDF document text
- https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/q2dhvftqc8ufghkj677o47mjj3/xigubalabolaxivalujotu.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=braised+pork+country+ribsPDF 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_off0000e645.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE645	10960 bytes
SHA-256: `5029ec249f2a169234fe4fe6fd703c57c38bae3f1c192e8d7fd5cc2c7e4938d1`
`font_01_sfnt_off0000ffa8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFFA8	16924 bytes
SHA-256: `cc4fca890b9e9ea55b9721ab12b5fd3ef4dc0d9b65c1785d9e070c18e85e6ed8`
`font_02_sfnt_off00012c10.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12C10	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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