PDF malware analysis — malicious · 357bcf2d7ec2281f

MALICIOUS

PDF

67.8 KB Created: 2021-06-25 16:01:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 28bbb9c174ab50011311f3798090e38b SHA-1: 2b30a2165f1429ca66f065bc24bda9d200dd88ae SHA-256: 357bcf2d7ec2281fda146eb327a067b6acf2a320e894a30fad7c5ad806bac501

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. The heuristics reveal that the PDF contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to distribute malicious content or phish users. While no scripts were directly extracted, the nature of the URLs and the detection names point towards a phishing or trojan distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9993

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://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/d418c63ba37db791606050302d75658d/zerizazowopoxisopozileji.pdf In PDF document text
- http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/dajigupiniwojoji.pdfIn PDF document text
- http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b1f3b8120---49677145802.pdfIn PDF document text
- https://duext.com/wp-content/plugins/super-forms/uploads/php/files/2290d2fdf4b730d7592651f858b43cc8/tejuzowetoxavi.pdfIn PDF document text
- http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6936cc658---255604010.pdfIn PDF document text
- http://eko-inwest.eu/upload/file/tutosazuwatumiko.pdfIn PDF document text
- https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/51b18e11201be2a7626eaeba6b4a232a/podefumosobikado.pdfIn PDF document text
- http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a90234ba84b---11442420141.pdfIn PDF document text
- https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3f975d663---15992389895.pdfIn PDF document text
- https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/dc11965f87c601a678f089907f50719f/90071228974.pdfIn PDF document text
- https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160882577a4510---50271843477.pdfIn PDF document text
- http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607abe23cf37d---92823430147.pdfIn PDF document text
- http://www.advokat.com/app/webroot/img/fck/file/kimeniwonil.pdfIn PDF document text
- https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/kfu5t4kp6dluf6899j29fvfc6c/96800765281.pdfIn PDF document text
- http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5e098a417---41663582770.pdfIn PDF document text
- http://abnicum.com/files/file/45040764078.pdfIn PDF document text
- https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/cb374bdf17e9c266482a4fa87f01412f/56509080540.pdfIn PDF document text
- https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/3bae84a162f005a3f0729c4386e7fc1f/86581728292.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=sq+ft+to+hectaresPDF 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_off0000adb3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xADB3	10412 bytes
SHA-256: `7c296bf03e7704cc89cead47205e563a348dfb2ae98885be195268b108d1b36c`
`font_01_sfnt_off0000c56b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC56B	14692 bytes
SHA-256: `fc2f532758e9e5c5f51610c15614f83c86e5cc1e63995211d426bdd9d14bbf2d`
`font_02_sfnt_off0000ea6a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEA6A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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