PDF malware analysis — malicious · 1b0f16f174ffa5fe

MALICIOUS

PDF

93.5 KB Created: 2021-07-07 16:14:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25

MD5: eeaeec0d5229f5b11faba5d1596afd29 SHA-1: a99328fb206c47f89f16defe3dafd4977b7e9bf3 SHA-256: 1b0f16f174ffa5fe992fa352c425ef41b0cae509e5e33ab71ff4e9e1e07f1428

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file contains embedded JavaScript, which is often used to redirect users to malicious sites. Multiple heuristics indicate the PDF acts as a link farm, pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to obscure the final malicious destination. ClamAV detection and ML classification confirm the malicious nature, likely related to phishing or malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9936

Heuristics 7

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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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://krisoc.ru/uplcv?utm_term=kh2+how+to+level+up+valor+form PDF link annotation
- http://morard-mcf.fr/data/Files/dijarabuduf.pdfIn PDF document text
- https://jagamimpi.info/contents//files/rinogodugamelugudatitog.pdfIn PDF document text
- https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/2c0cabb4fc7d88e8ed9f1ab61eed311e/64735377064.pdfIn PDF document text
- http://wu-pao.com/upfiles/editor/files/mever.pdfIn PDF document text
- http://deborahbrown.us/clients/860103/File/basatutive.pdfIn PDF document text
- https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/ejbkk4vcnegnmm4j9gnaijmeoo/60548861350.pdfIn PDF document text
- http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a73fb82b7a7---sobanuwabivekavateniwige.pdfIn PDF document text
- http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160819fae40f10---melegukosugasatomope.pdfIn PDF document text
- http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b31e9b23697---5553593934.pdfIn PDF document text
- http://andlupa.com/userfiles/file/53957653511.pdfIn PDF document text
- https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cbeac60d0bf---85856361988.pdfIn PDF document text
- https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/7a1aefee5a856ff27fcc0ecec7a9d39d/kotiz.pdfIn PDF document text
- https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/b9c76518b948d24695c267b514b8182f/82967690672.pdfIn PDF document text
- https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/4bfe8780b1398000690dda534060ed29/zoruwepalilolixazogulozim.pdfIn PDF document text
- http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160b2558b2d4f3---74109537644.pdfIn PDF document text
- http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc551468a0c---gululepobuwala.pdfIn PDF document text
- https://unique.global/wp-content/plugins/super-forms/uploads/php/files/7730957ecce0cdcb9cbd2b6c4b483db2/velamodat.pdfIn PDF document text
- https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca050bd14e---4511629990.pdfIn PDF document text
- http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c01c0a4146---5647856327.pdfIn PDF document text
- http://amon-syotengai.com/userfiles/file/wexisegivegivad.pdfIn PDF document text
- http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d7c1e3637af---xolupemizerokizigirojidiz.pdfIn PDF document text
- http://kaizousha.com/js/upload/files/22882162429.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f26d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF26D	10620 bytes
SHA-256: `39c6835658dfc80fbda95a168de4e451032bdfc5af1e9fa9fa17d47a83df00bb`
`font_01_sfnt_off00010ad8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10AD8	17576 bytes
SHA-256: `2c89d52e0aeae790d3952064f92d590d3e599a528fdc0165fdda64b99202c22a`
`font_02_sfnt_off000138ca.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x138CA	16752 bytes
SHA-256: `7c1a8eb0b9c23cf203c969b5d5d5631f8eb4ae760335902abb309347e0b2a7e8`
`font_03_sfnt_off0001505e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1505E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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