PDF malware analysis — malicious · 76a81b01f6b569ad

MALICIOUS

PDF

84.2 KB Created: 2021-08-26 14:43:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 7c2c8f7aea074851ebcb141c7632924d SHA-1: 490d0a33bc628239202b96a90818e718661d8adb SHA-256: 76a81b01f6b569ad30c307ee49077e158289bca7834d89b003cf2bacde253b57

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external PDF files hosted on compromised WordPress sites, indicating a link farm or distribution mechanism. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of multiple compromised CMS upload links and SEO-related link farming heuristics further supports this assessment.

Machine Learning

Nyx PDF Classifier malicious score 0.9944

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 http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607488ce4c1ff---xisipiguwarijuposibudeji.pdf In PDF document text
- http://leylasuren.com/images/userfiles/imagefile/pupiwetenowaseteledakix.pdfIn PDF document text
- http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/7762762436.pdfIn PDF document text
- http://schodylux.pl/userfiles/file/guvimisap.pdfIn PDF document text
- https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f74c93acf92---jinabe.pdfIn PDF document text
- http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/cadd0060a932f02f12e38d729206269e/21131457299.pdfIn PDF document text
- http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccd88967117---7799484512.pdfIn PDF document text
- https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607996b6e3af6---68200913224.pdfIn PDF document text
- https://transpack-krumbach.de/_upload_bilder/_filemanager/file/bederasekasesajepasux.pdfIn PDF document text
- http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b10d11a1f---vuzubizivowewodoxirovutat.pdfIn PDF document text
- https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/ec7cd7240146f6bdcbd8dc63ff4183a9/84570742113.pdfIn PDF document text
- https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/of2q4qc9vbv4aomlubip0ce7t4/10232839225.pdfIn PDF document text
- https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/38ad52393bfa9e96576a7439fb1d16db/jusofi.pdfIn PDF document text
- http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa8de27f76---tutobutemememe.pdfIn PDF document text
- http://ozanatalan.com/iboard/includes/userfiles/files/mizaxibiro.pdfIn PDF document text
- https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c64ef28eca4---nudevi.pdfIn PDF document text
- https://treasurehunterdetectors.com/ckfinder/userfiles/files/bofelidazurosireka.pdfIn PDF document text
- http://precedent.by/_newsite/images_from_html_editor/file/36832594181.pdfIn PDF document text
- https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/a0fc0d7233d6ca3b4ca61e22c40c7bfe/lujobunovosagigo.pdfIn PDF document text
- http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1609927c9bf61a---dosavogikukabog.pdfIn PDF document text
- http://bizbecho.com/pa/trainstation/uploads/image/file/tadomadaxokuxubura.pdfIn PDF document text
- https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/q9v71fsnt19nh77leugk7610pa/13513416674.pdfIn PDF document text
- http://xn--tnqz8hz5cb8l.com/upload/files/83669512487.pdfIn PDF document text
- http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16096dd73cff32---86315153100.pdfIn PDF document text
- https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf6aab3d30e---60748604112.pdfIn PDF document text
- https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161219d83547da---debazegadulam.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=will+grass+seed+grow+in+octoberPDF 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_off0000e76b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE76B	16256 bytes
SHA-256: `16977e9c48fd3f5594b82264f5eb241e21270038195e754949bc2cfd8d4795d9`
`font_01_sfnt_off0001118e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1118E	10764 bytes
SHA-256: `136fd0add54f4bed8a942e5df20e9d7f4aeec37d6b7ceb4d3163dee55ba907e6`
`font_02_sfnt_off00012a4b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12A4B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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