PDF malware analysis — malicious · 5de2fdcd4498bed3

MALICIOUS

PDF

86.4 KB Created: 2021-07-06 17:02:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15

MD5: 81259f9d56e09f484c249941b67d6011 SHA-1: f73b253079fa245b9f8908a80c22571226f9b920 SHA-256: 5de2fdcd4498bed324adee4dd11ef9cbe8975750556634c6bd4dce7ce3e87bd3

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model indicated a high probability of maliciousness. It contains a link farm pointing to multiple compromised WordPress sites and other disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics indicate this file is part of a phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9848

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://bloomx.com/sites/all/sites/bloomx.com/files/69875877818.pdf In PDF document text
- http://jarosi.hu/files/file/36748974310.pdfIn PDF document text
- https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/e0crutsmq2at5cdn408qov1bve/bopivuburelumavabukiripi.pdfIn PDF document text
- https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c7fb31f3a---zajodijadasugoponu.pdfIn PDF document text
- http://nuraski.pl/wsg/userfiles/2889843337.pdfIn PDF document text
- https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/9c8ammvq6p7pjj0kcf26mgkgf6/simomigusisi.pdfIn PDF document text
- https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/ddaed1a528b076d92f47adc50cddf0ee/92056689175.pdfIn PDF document text
- https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/06590d533fb742d38c0404a683d12b03/joguxesa.pdfIn PDF document text
- http://pressvaluation.net/userfiles/file/3273947282.pdfIn PDF document text
- https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/0a3f30840db1d14126d061e17545e999/xugipokidafup.pdfIn PDF document text
- https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c00605c04c2---fegababavibebeko.pdfIn PDF document text
- http://aimic.com/userfiles/file/nepepamifaruz.pdfIn PDF document text
- https://audreyheselmans.com/_files/file/surodefunuwunareviso.pdfIn PDF document text
- https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f387648556---17471996258.pdfIn PDF document text
- https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a312c4fe2---71677541728.pdfIn PDF document text
- http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160908b617015b---50709914229.pdfIn PDF document text
- http://relocationservicesgroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d043c05724---94370130973.pdfIn PDF document text
- https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/b4108187c6017588a843bf25b8f36da2/80672707994.pdfIn PDF document text
- http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b010505e312---tuwepufarolazap.pdfIn PDF document text
- https://sasalidayanisma.org/uploads/file/jifuxuk.pdfIn PDF document text
- https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/7a1f66275f2d1d11d3e7e4949e25a924/72600906282.pdfIn PDF document text
- http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083f3ec2fc9b---gonotulafexanuzek.pdfIn PDF document text
- http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1cc0d3d719---namapakelev.pdfIn PDF document text
- http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/cf3f718780e4bbe213cd8118b69e9e5f/kanovonejezelopixemo.pdfIn PDF document text
- https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/52f18ca9e506787d5881e90d316ff285/sibeluful.pdfIn PDF document text
- http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609fecc6ed6a6---13171200852.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=hot+to+cook+corn+on+the+cobPDF 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_off0000ef74.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEF74	10084 bytes
SHA-256: `3f299f3f273e7244c7cc29eec0bfeefd9919bbcd086ef01c3a3c773c25dff9a9`
`font_01_sfnt_off000105cd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x105CD	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011ddf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11DDF	17864 bytes
SHA-256: `e211cc4b32f4a10cf7a2a23a0442102c4a4cd72ab1e831f698ba74f9d62b9f18`

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