PDF malware analysis — malicious · a823571de3a244e2

MALICIOUS

PDF

93.2 KB Created: 2021-07-14 00:52:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: b96a86c204fb9cfb7ce18fffefa30520 SHA-1: 499251ada7a8f1e6fe582ae7d6970482335444be SHA-256: a823571de3a244e270083de3371edfb51cdbe12bc8605545c29bee5ce14c5375

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm or SEO poisoning attack. The primary goal appears to be directing users to external malicious sites, as evidenced by the numerous PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristic firings.

Machine Learning

Nyx PDF Classifier malicious score 0.9924

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://inwebjor.ru/uplcv?utm_term=from+blood+and+ash+book+pdf PDF link annotation
- https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160984ef31ff56---40043827919.pdfIn PDF document text
- http://sdds.be/userfiles/file/xisubekigix.pdfIn PDF document text
- https://too.kg/wp-content/plugins/super-forms/uploads/php/files/84e1242390920092747b4a449970476d/teruzapufu.pdfIn PDF document text
- http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16086ebd92e63b---11619972411.pdfIn PDF document text
- http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077518e989ac---baratesonep.pdfIn PDF document text
- https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/bef3g225pjn581baj794mfc97p/nifad.pdfIn PDF document text
- https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/d4fcef9a0fafe1a6054376626e25a05b/9482245791.pdfIn PDF document text
- http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160dcc5c9342f1---17882386246.pdfIn PDF document text
- http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a34b392fa32---livasavim.pdfIn PDF document text
- https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/4kgeof5jjj19jnv0r6ng34lct5/zigiripimemoje.pdfIn PDF document text
- https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c38f1c39544---8529259001.pdfIn PDF document text
- https://fokusmedia.com/images/uploads/zilomovuxawivagijasozitun.pdfIn PDF document text
- https://www.micd.edu.np/ckfinder/userfiles/files/49812102987.pdfIn PDF document text
- http://brilspa.ro/userfiles/file///8787716913.pdfIn PDF document text
- https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce96bc24d2---16318216723.pdfIn PDF document text
- https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/no2jr88qqb99mj8kqg7gvpdqp9/78424958387.pdfIn PDF document text
- https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/9a5081447f6469b2b04a2667763fd4a6/8259752804.pdfIn PDF document text
- https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/6833b880ea430cfa85f2e589f0d13327/gukipezasitowikisena.pdfIn PDF document text
- https://callalilyvn.com/upload/files/bifurevovelomeminorefama.pdfIn PDF document text
- https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/4ee034a252e65006728d2af32189cfa4/42518734001.pdfIn PDF document text
- http://alemotta.com/resources/original/file/vefeno.pdfIn PDF document text
- https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0b6873cc8---62390039979.pdfIn PDF document text
- http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a819b5a95dd---tajalixudijesifitosiw.pdfIn PDF document text
- https://avflash.nl/upload/files/71528850597.pdfIn PDF document text
- https://wecareprogram.org/images/file/vivabi.pdfIn PDF document text
- 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f014.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF014	17996 bytes
SHA-256: `a07d9386f0cae54bc0960cb07619fccd75934025e898dd6f0c90bea8f5d51a9e`
`font_01_sfnt_off00011f79.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11F79	10652 bytes
SHA-256: `46450ef7ecf733416af2d47a7417f40295151479d344223539340517b40de629`
`font_02_sfnt_off0001375c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1375C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off00014f6d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14F6D	16312 bytes
SHA-256: `7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae`

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