PDF malware analysis — malicious · a73a54b4a25f58d1

MALICIOUS

PDF

91.2 KB Created: 2021-07-03 09:30:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: abeb364c55a8f0459cc4b5c78e11a646 SHA-1: 282315ca4abe10fe3e38ff3219d65ca2b85a9eda SHA-256: a73a54b4a25f58d13528b77d3d676b8eb0b4731379ea9ec48ebe2b1b08873b5f

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads, consistent with a spearphishing attachment attack vector. No scripts were extracted, but the structure strongly suggests a malicious redirection scheme.

Machine Learning

Nyx PDF Classifier malicious score 0.9935

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://infrive.ru/uplcv?utm_term=vanda+and+young+songwriting+competition PDF link annotation
- http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa25b8da73---95998001678.pdfIn PDF document text
- https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/e05f472245ceab7083a1ab6e90725e16/73322215453.pdfIn PDF document text
- http://studiotravenzolo.it/userfiles/files/47685991732.pdfIn PDF document text
- http://tkvolley.pl/upload/files/16806597012.pdfIn PDF document text
- https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/6e435585f4629c527c89a44d1ae52ac9/64050149195.pdfIn PDF document text
- http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609da7318598a---85383104626.pdfIn PDF document text
- https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c367211de4a---wijosolotukarug.pdfIn PDF document text
- http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c97a339709---desefidepunonafonor.pdfIn PDF document text
- http://dzbnf.com/upload/file///wosumenafokipojibiz.pdfIn PDF document text
- http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/ejeepcemcnqchv27hetg95d2nn/50544070976.pdfIn PDF document text
- https://study4student.com/cache/fck_files/file/pufese.pdfIn PDF document text
- http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16096d9c7e8e19---88792376027.pdfIn PDF document text
- https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/4f0ddea1503ad148b1d5918844b51521/92349223369.pdfIn PDF document text
- http://uekekb.ru/!upload/files/nunidukojuxapagixadubusud.pdfIn PDF document text
- http://beachfirebrands.com/userfiles/file/bapaxugetagewakowi.pdfIn PDF document text
- http://akkoryazilim.com/userfiles/file/tegadukekowomeri.pdfIn PDF document text
- http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca0ee51cd15---xevenefalopefivulefito.pdfIn PDF document text
- https://frontlinetherapist.com/wp-content/plugins/super-forms/uploads/php/files/59e1f46dcc2a1ab312690b17b1591992/najaw.pdfIn PDF document text
- https://too.kg/wp-content/plugins/super-forms/uploads/php/files/a08f0b8a15fa5c967cf6ccfa7f4772e5/zefupedunikoxetinadi.pdfIn PDF document text
- http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jeloderiminegijevonovises.pdfIn PDF document text
- http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b87dfd2cf5---35154036634.pdfIn PDF document text
- https://caribemed.com/userfiles/file/68099623458.pdfIn PDF document text
- https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/db638a0a03c980b3681c5d17a9f32781/53292564283.pdfIn PDF document text
- https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/2b9fkt1kbvcv8mann5ck3l34ar/72457697651.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_off0000ffba.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFFBA	17536 bytes
SHA-256: `6aaf1a61c39649220d51ab4afced2ecffe13d439a3edbd264458ebaf8340ce1e`
`font_01_sfnt_off00012d80.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12D80	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00014597.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14597	11080 bytes
SHA-256: `2a36a435208a4f6ea7aef147435c8c437716a063cf1706e2a96dc21de60fb9f5`

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