PDF malware analysis — malicious · 65c259db98d8858b

MALICIOUS

PDF

106.1 KB Created: 2021-08-16 00:55:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: b3e31cc63eb5f2e296ae0884db245220 SHA-1: 417a8ebef0d420dedacf2e83a0e707ac2818d1cd SHA-256: 65c259db98d8858b1a50e20db5ba955f27e6d350de318e699206570f8a52940d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous external URIs pointing to compromised WordPress sites, indicating it functions as a link farm. These links likely lead to phishing pages or further malware downloads. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

Nyx PDF Classifier malicious score 0.9976

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://synerhu.ru/uplcv?utm_term=descargar+libro+la+conspiracion+de+los+ricos+pdf PDF link annotation
- http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a3598088e02---29367023521.pdfIn PDF document text
- https://saam.vn/images/content/file/25115749938.pdfIn PDF document text
- https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/s1677l3cd7oie1dmfcebmtne6b/69289207302.pdfIn PDF document text
- https://apskarota.org/userfiles/file/rovasodejipobevuzewa.pdfIn PDF document text
- https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/f4e49ca4cd54d6979d8c83d251619bc3/givulidoza.pdfIn PDF document text
- https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9b448e08aefe64d192c31a79f015b679/57118541706.pdfIn PDF document text
- http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096aea419a13---97698234986.pdfIn PDF document text
- http://andrelandberg.com/userfiles/file/serilunibexar.pdfIn PDF document text
- https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/adea118b75d42d5cbca48854ad8d62c1/3069779811.pdfIn PDF document text
- http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1e6c5c8b0---xovezulamivakogukizunuxa.pdfIn PDF document text
- https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908c0534015---12785139869.pdfIn PDF document text
- https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/b01b67f6a45cc563c8151d0ad6acc157/wegejagat.pdfIn PDF document text
- http://evaemlak.com/userfiles/file///2942453141.pdfIn PDF document text
- http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/17137989285.pdfIn PDF document text
- https://mgogs.com/mgfiles/file/jokavisepisolipat.pdfIn PDF document text
- https://astek-telem.fr/userfiles/file/7894524428.pdfIn PDF document text
- https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/0c3876695c725541d0b1ab2a9d140197/tuzuzimipodege.pdfIn PDF document text
- http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16080812718baa---wunasawikabobib.pdfIn PDF document text
- https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764e4ac100f---47490271163.pdfIn PDF document text
- https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/ee8v834r7lfe8uk6hnac9d4iga/ripelek.pdfIn PDF document text
- https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861fb713f68---84973196452.pdfIn PDF document text
- http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160742bd485d64---xenavubimovigevevitonap.pdfIn PDF document text
- http://aexpress.lv/index/images/up/file/51456106937.pdfIn PDF document text
- https://tylbm.com/Upload/ckeditor/files/27028854410.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_off00013bd9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13BD9	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off000153f0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x153F0	10836 bytes
SHA-256: `5bcd1e0159aa29da025480dc97e040e113dc46fa7cdc46067921e28e533159e2`
`font_02_sfnt_off00016c91.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x16C91	17860 bytes
SHA-256: `b6495f49492a6746d2eb6705e4ad234aef00f2711faf89c1be91c70de84d2389`

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