PDF malware analysis — malicious · c95e1f3e0c12af7a

MALICIOUS

PDF

87.3 KB Created: 2021-06-27 22:37:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25

MD5: a8254c8c7fbfbb6eb005802f3ef9e132 SHA-1: d33a43a1f431ad02b2277cfdb8d7139d9f3d3f87 SHA-256: c95e1f3e0c12af7a1512df5edc18345599e33f68ac630ab08b16dabbfe5f6d72

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF document was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised CMS upload directories, likely serving as a distribution point for further malicious content. The presence of external URIs and link farm characteristics suggests an attempt to lure users to external sites, potentially for credential harvesting or malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

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.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d23d1efd9---90761523859.pdf In PDF document text
- http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a078e1dc2---dafipaludazesuduxobaveve.pdfIn PDF document text
- https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/1373617d85eb82a288c0cdd909016313/32869621799.pdfIn PDF document text
- https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/04c33b43bee29bdcc8a32aa8193a97cf/75637322451.pdfIn PDF document text
- https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/06de367f5cebdd21d282e8b9d635467a/12354687696.pdfIn PDF document text
- https://itandem.net/ckfinder/userfiles/files/wakitofuke.pdfIn PDF document text
- http://myredm.ru/uploads/file/73059278899.pdfIn PDF document text
- http://www.aadhar-interior.com/userfiles/file/14984003634.pdfIn PDF document text
- http://hutbephottaihaiphong24h.com/upload/files/fepovegod.pdfIn PDF document text
- http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba683322b07---fumebazitavu.pdfIn PDF document text
- http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160788bffc9c87---8062185157.pdfIn PDF document text
- http://mp-hd.de/data/aktualnosci_imgs/file/dedutufepoxar.pdfIn PDF document text
- https://hostingalani.com/calisma2/files/uploads/ziruluz.pdfIn PDF document text
- https://etcbt.com/userfiles/file/sedosatuxewudoj.pdfIn PDF document text
- http://kovacsoltvaskerites.hu/images/file/26375945335.pdfIn PDF document text
- http://mofrantech.com/userfiles/file/jumazekebegovonivole.pdfIn PDF document text
- https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160763946488e0---3209651136.pdfIn PDF document text
- http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825be51a1c7---91960443468.pdfIn PDF document text
- https://beysukonaklari.com/ckfinder/userfiles/files/xevasizopinefetimimax.pdfIn PDF document text
- https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d887598a12e---6184062009.pdfIn PDF document text
- https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/oahq7mhj7upa1d65krq302aro3/88505540341.pdfIn PDF document text
- https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/49c827961c112c2f434bd20c1372640b/13194923956.pdfIn PDF document text
- https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087cd8aaafa2---54665675199.pdfIn PDF document text
- http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e06436ffe6---bodelamev.pdfIn PDF document text
- http://tevukasveza.lt/ckfinder/userfiles/files/basozakuwi.pdfIn PDF document text
- http://baigeleather.com/userfiles/file/59090357491.pdfIn PDF document text
- https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/f1bc61a30e7eee978b754e3150378494/detosibuzit.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=lake+city+co+to+ouray+coPDF 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_off0000f2ee.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF2EE	17608 bytes
SHA-256: `3a09b136675d72de71f1da6526227620ab4721c0e439e6f022edb820b72a6885`
`font_01_sfnt_off00012105.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12105	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001391c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1391C	10168 bytes
SHA-256: `0d06c38ed56766916975541e8ad579fefde6b1b3f41e2e628f8516e3c0dc49d3`

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