PDF malware analysis — malicious · af3d42f0add33a8f

MALICIOUS

PDF

88.3 KB Created: 2021-09-19 04:20:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 65313a739457bf30ecee057730a2493a SHA-1: 3af389343a3a18f11c75102181ce38cd880b7ccf SHA-256: af3d42f0add33a8f4250c562a7c071ff4819962ca6611160e0f71f821e8b72dc

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 classifier indicated a high probability of maliciousness. The document contains numerous external URIs and link farms pointing to potentially compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate this file is likely part of a phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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://garglob.ru/uplcv?utm_term=ramon+campayo+lectura+rapida+pdf PDF link annotation
- https://mycocoa.org/images/upload/files/62526781016.pdfIn PDF document text
- http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1613211a68c91f---zejapugupa.pdfIn PDF document text
- http://zimmerei-possert.at/72514077348.pdfIn PDF document text
- https://alaqart.atelierleuthold.ch/userfiles/files/rifofuzavoragexular.pdfIn PDF document text
- http://akvatoria.by/UserFiles/files/62668082114.pdfIn PDF document text
- https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/85afd7897779c1273988ca0192f64be7/nukemupimasigisaxono.pdfIn PDF document text
- https://truckforceone.com/upload/editor/file/44984565444.pdfIn PDF document text
- http://artpolyclinic.com/file/files/vidoxewew.pdfIn PDF document text
- http://nbnjl.com/userfiles/files/2274470647.pdfIn PDF document text
- https://laetitiabernard.fr/images/file/89831715825.pdfIn PDF document text
- http://nhagiatxanh.com/public/default/ckeditor/files/60297541984.pdfIn PDF document text
- http://biondiairsystem.it/userfiles/files/25041171990.pdfIn PDF document text
- http://techcessgroups.com/userfiles/file/54088345648.pdfIn PDF document text
- http://sooam.com/files/fckeditor/file/651387836612f0aad8f863.pdfIn PDF document text
- http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382d0e4f119---kukemarolamoruguvufizidex.pdfIn PDF document text
- http://highdeal.linkeo.net/ckfinder/userfiles/files/89210356732.pdfIn PDF document text
- http://sobateracota.ro/mm/file/38979205965.pdfIn PDF document text
- http://mientrungland.net/uploads/image/files/48983040819.pdfIn PDF document text
- https://es21sys.com/userfiles/file/88584348018.pdfIn PDF document text
- https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/68a2cac5301a1ce7810bc2620602d67a/89523022507.pdfIn PDF document text
- http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a5383e2d2---nalusiwekexiwevoso.pdfIn PDF document text
- http://artvideo74.ru/upfiles/files/30170852486.pdfIn PDF document text
- http://vector-mebel.ru/uploads/files/vafup.pdfIn PDF document text
- http://carrasvilla.es/uploads/files/piguzajapisovarixarirusiw.pdfIn PDF document text
- https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbde39e8aa---77150262335.pdfIn PDF document text
- 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_off0000ef3e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEF3E	19664 bytes
SHA-256: `c3aa065afd3d6c365a1e8ba8ae9fe24db11da0b3b8d4b3c87275acd272b6973b`
`font_01_sfnt_off0001222e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1222E	10872 bytes
SHA-256: `7fc2f3ca6ff487ba17f4c60639e82d28dd58e237c02f397b06503cbdb5b6de5c`
`font_02_sfnt_off00013b4d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13B4D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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