PDF malware analysis — malicious · e42443c6378f3df8

MALICIOUS

PDF

84.1 KB Created: 2021-09-02 03:37:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: e7b3c99f649cc43b780618c76019398c SHA-1: 93b45837bda8a3ff98132cce5f1ea38c593e6455 SHA-256: e42443c6378f3df8d54dcee75677ec64028ad1816123a4565b93f9641d6cfc5c

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or SEO poisoning attack. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were explicitly extracted, the PDF structure and embedded links indicate an attempt to redirect users to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9833

Heuristics 5

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://laborke.ru/uplcv?utm_term=infected+scrotum+cyst PDF link annotation
- https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/af4c68e3ff76154eaf90c849d90ed091/zemevekipomevid.pdfIn PDF document text
- http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1606cacf871a90---jagon.pdfIn PDF document text
- https://acavacecio.it/userfiles/files/guzuxexub.pdfIn PDF document text
- http://omak1968.com/clients/71178/File/kejisepasu.pdfIn PDF document text
- https://otoform.com/upload/ckfinder/files/pevikabakigipemib.pdfIn PDF document text
- https://indirimlipin.com/calisma2/files/uploads/17037369891.pdfIn PDF document text
- http://geoplan.su/userfiles/file/ronuli.pdfIn PDF document text
- http://vo23.ru/upload/file/diramos.pdfIn PDF document text
- http://clean-ecology.com/Upload/files/larawowotikunu.pdfIn PDF document text
- http://remobudostol.pl/pliki/24463674989.pdfIn PDF document text
- http://petraifevronii.ru/ckfinder/userfiles/files/wojekanilarefitiwo.pdfIn PDF document text
- https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/vbentteorr42ce8khajj081t7n/93454622155.pdfIn PDF document text
- https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c26502abca6---7338272931.pdfIn PDF document text
- http://dienvietbac.com/uploads/files/23752667244.pdfIn PDF document text
- http://uniquecharacters.com/upload/files/61698976635.pdfIn PDF document text
- https://gamedunyasi.com/calisma2/files/uploads/99036278377.pdfIn PDF document text
- https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/13c02fc8618fb955e6e02f504e255e87/dogomiwinowusepitexig.pdfIn PDF document text
- http://voszveszprem.hu/_user/file/jitufofexozidozemivabigil.pdfIn PDF document text
- http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/42f763f1d6d8521812e0fd4c27b1ca4b/85917562477.pdfIn PDF document text
- http://simonide.org/userfiles/file/79006816145.pdfIn PDF document text
- https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16070140f33ce1---96771613571.pdfIn PDF document text
- https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16085a267b32b0---93712106624.pdfIn PDF document text
- http://www.amanuttarakhand.org/ckfinder/userfiles/files/ratejuros.pdfIn PDF document text
- http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a521ceb29---19976534587.pdfIn PDF document text
- https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f8cd627f9---67731856915.pdfIn PDF document text
- http://webinaris.eu/ckfinder/userfiles/publics/files/98233552652.pdfIn PDF document text
- https://nhachoxebus.com/upload/fck/file/22754608046.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e81c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE81C	17196 bytes
SHA-256: `005a7f8b577cd5a83ed288a544df202fd2fe40b83ed6d02f55ed31a17b9e6b27`
`font_01_sfnt_off0001144d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1144D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012c64.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12C64	10500 bytes
SHA-256: `bc4441ff1f706c49f45290c6ddc9bb02af39e8d3f91b7b742f1a532b0902d332`

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