PDF malware analysis — malicious · 1c83140111c1db71

MALICIOUS

PDF

84.8 KB Created: 2021-07-04 15:24:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 79205a40ef33d653bdd9d1f2af4459c0 SHA-1: 0d318a949d5dd1eb93009fe9f4093892acc0096d SHA-256: 1c83140111c1db715255846b01308c2a3d5c3677372ce04e3cf429d2c6c5ebe6

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites. These links are likely intended to lure users to phishing pages or download further malicious content. The PDF's structure and the presence of multiple links on potentially compromised hosting suggest a coordinated effort to distribute malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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 https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/26eeee808dcae84e84f4c7e71c81f5a0/38940143305.pdf In PDF document text
- http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160701e0d707b4---taduvifiti.pdfIn PDF document text
- https://ozmutludokum.com/userfiles/file/44328696634.pdfIn PDF document text
- https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/e264112049969e8e8fe19e1e34d5a1c2/39215362004.pdfIn PDF document text
- http://reicar.dk/userfiles/file/51244173719.pdfIn PDF document text
- http://kcde.kr/userfiles/file/57467336936.pdfIn PDF document text
- https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/5a0i6mvr7gbbmtvfk9vp98f67o/36142654844.pdfIn PDF document text
- https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/t00hcrfrkc9aldh69pljhm8082/razava.pdfIn PDF document text
- http://meadescafe.com/userfiles/file/6732748052.pdfIn PDF document text
- http://arniestribu.com/campannas/file/lexoba.pdfIn PDF document text
- https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/5566b0a5c6c519385f99d1ce68baebb5/84218204761.pdfIn PDF document text
- http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5687ebaf77---85417710203.pdfIn PDF document text
- https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/230075dd0c3f7fd3fdea3fc468e6843e/nepuxixitowi.pdfIn PDF document text
- http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/ead305b367c5131d3fc5825ac8ec8263/94202035795.pdfIn PDF document text
- http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1b3b346374---11422640701.pdfIn PDF document text
- https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/9b2ccdgblpbk6rgb7o0s78ff1a/guwewelowibowabapuf.pdfIn PDF document text
- https://bamor.org/userfiles/file/gimipigifebifebilaf.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e4d5cc3d9---31219773665.pdfIn PDF document text
- https://samsungvrvklima.com/upload/ckfinder/files/85310927989.pdfIn PDF document text
- https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/219107c7584206ed84cb33d1e1dc7b8f/15344036079.pdfIn PDF document text
- http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7acfd9d6d---sigalufopanibomawumudo.pdfIn PDF document text
- https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/9nbmqb3doau1mb7i4uuda7bfc0/18153083148.pdfIn PDF document text
- http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/mrp7rqeu2l3stc5ttn3upk2su2/8959477875.pdfIn PDF document text
- https://pima-alarms.net/slicice/file/96755298474.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=lower+neck+upper+back+stretchesPDF 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_off0000ea03.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEA03	10708 bytes
SHA-256: `6c1781306e9c95b6b74e1f21865f74eb6d7ab4b3fe55af58db7c90ea90f27d91`
`font_01_sfnt_off00010269.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10269	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011a7b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11A7B	16900 bytes
SHA-256: `258ad3c3310316419fd8893cf42f2a92ef3e6b7ebda86f1f40298365a5ca5e0a`

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