PDF malware analysis — malicious · fd778b0aef4cb80f

MALICIOUS

PDF

80.0 KB Created: 2021-07-16 07:03:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 6e4e6c3895ba0860fcb1eded35fa413d SHA-1: 99dc3be3e2b3d0d02fb63e8303ca73a89f778257 SHA-256: fd778b0aef4cb80fa91962052189c35dce8837b306ee1f6468ccdd69b94b3abb

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristics and URLs clearly show a link farm designed to lead users to potentially harmful content.

Machine Learning

Nyx PDF Classifier malicious score 0.9949

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://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5e0e84e5d---devigakis.pdf In PDF document text
- http://18554080.com/userfiles/file/vufipivovaka.pdfIn PDF document text
- https://airflow-skateboards.com/upload/file/77051863965.pdfIn PDF document text
- https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/30abb81683d31fa82f5de2d21278d472/togoxidavajusixabilo.pdfIn PDF document text
- https://aonetreks.com/uploads/file/tezatunaze.pdfIn PDF document text
- https://deepankarbasu.com/FCKeditor/file/lawuvaxezer.pdfIn PDF document text
- http://fmi.lu/userfiles/files/wekofironeguxorofunumuli.pdfIn PDF document text
- https://prtl.pl/userfiles/file/75309974970.pdfIn PDF document text
- http://studiotrusso.it/userfiles/files/8629365645.pdfIn PDF document text
- https://iwnta.com/userfiles/file/82119982940.pdfIn PDF document text
- https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160735c891cc5b---51155538535.pdfIn PDF document text
- https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b43b0090be6---40626544231.pdfIn PDF document text
- http://dush-kz.ru/uploads/fck/file/63351436395.pdfIn PDF document text
- https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/7b6bdbd0e5bf25d25181f3d0784347b5/zilagolileraguzi.pdfIn PDF document text
- https://binarbaidservices.com/public_html/userfiles/file/10282227235.pdfIn PDF document text
- https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/2a04937189851a3b273f2793a814f0de/wurakinokolejiri.pdfIn PDF document text
- http://fecoil.com/userfiles/file/5819702182.pdfIn PDF document text
- https://consultingexpert.eu/fckeditor/userfiles/file/2982579726.pdfIn PDF document text
- https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160892ae90b0dc---mugazuxexopa.pdfIn PDF document text
- https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/a55ea083d538d3e86521c3d9add1937f/gewigotusabukumofovaxibum.pdfIn PDF document text
- https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/ab5750d77b8a6260fecd115daab07ba3/99700476199.pdfIn PDF document text
- http://aqbnb.com/uploadfile/file/muberuxek.pdfIn PDF document text
- http://amphorabeautyclub.com/campannas/file/15741776800.pdfIn PDF document text
- https://advantagelic.com/singhania/downloads/file/visegopal.pdfIn PDF document text
- https://trungtammatnamviet.vn/upload/files/kuliwezefedavegawinuba.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=simple+math+problemsPDF 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_off0000d506.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD506	10628 bytes
SHA-256: `a6247618fc3f7e3ebcfe4c84e3de3fdcb6db59d44f3759131b8c01fabcb034db`
`font_01_sfnt_off0000ed0a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xED0A	17492 bytes
SHA-256: `255d6105221d51ce8104407d0d36a0e012bca2810f8213e7c57028672fc9cd76`
`font_02_sfnt_off00011adf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11ADF	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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