PDF malware analysis — malicious · a5e612cbb8c4e274

MALICIOUS

PDF

88.7 KB Created: 2021-07-10 03:21:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27

MD5: f4d8b39f6aab4e1e0911460b94f0cc07 SHA-1: df92ca285cfad9d1c2f773c11c7b0bd7e4680705 SHA-256: a5e612cbb8c4e274a5b4c9ca038bddf1dfd6c9fae19002a32885931906758e77

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farms pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest it's designed to redirect users to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

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 https://chcial.ru/uplcv?utm_term=emerods+definition+bible PDF link annotation
- https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/3d5567dc3e3f5ae67b2394acbc237e9a/gulanabigunokovanejofume.pdfIn PDF document text
- http://bizbecho.com/pa/trainstation/uploads/image/file/vepiwuxewelo.pdfIn PDF document text
- http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723008b7f6f---21710481012.pdfIn PDF document text
- http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bae16fd6f6e---98941897888.pdfIn PDF document text
- http://zulassung4you.de/bilder/file/nuleza.pdfIn PDF document text
- https://ludifrance.fr/userfiles/file/62289361204.pdfIn PDF document text
- https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/e3d40a402cbddba3728ba0ecdd1abab3/53345983291.pdfIn PDF document text
- http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16094da20da7cf---76852082801.pdfIn PDF document text
- https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/2ser1kjq582ie548kv42sa38vm/17772430718.pdfIn PDF document text
- https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608566d30c0d2---tebutagi.pdfIn PDF document text
- https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2aef84354---lirenofiletafupumanuxitos.pdfIn PDF document text
- http://kondicionery-vidnoe.ru/upload_picture/file/32123314274.pdfIn PDF document text
- http://sport-way.ru/img/file/74411464655.pdfIn PDF document text
- http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160869db9051d6---77247651034.pdfIn PDF document text
- https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/49ec750df1b47fccfda1ea317555f954/95605157926.pdfIn PDF document text
- http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccab7b5fe2---58712024280.pdfIn PDF document text
- http://makingtheturngolf.com/clients/9/92/925d9bae4ecf380f28dbe0e1390c16eb/File/putorar.pdfIn PDF document text
- http://keralabiblesociety.com/fck_uploads/file/18107660391.pdfIn PDF document text
- https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608149a6c72e2---70988732056.pdfIn PDF document text
- https://capecoralliving.com/media/file/9507448642.pdfIn PDF document text
- https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/abd28cccoma9g58h8qa2v3g8an/fujiw.pdfIn PDF document text
- http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160811344dbfa8---woxaso.pdfIn PDF document text
- http://asokmontridental.com/userfiles/file/vijudixuxirinulamided.pdfIn PDF document text
- http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16085d79f4c023---38935095006.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_off0000f75f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF75F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010f71.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10F71	17948 bytes
SHA-256: `5e4f34b56244e03cae01b2120fc59debfb2ecdaeb023946991db98752506a944`
`font_02_sfnt_off00013df3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13DF3	10476 bytes
SHA-256: `047b19a66470c154c71a27fb88f2376d3a177974ff8f5cf73207d4d863e99f77`

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