PDF malware analysis — malicious · 8b478e6c9ef0cb18

MALICIOUS

PDF

82.1 KB Created: 2021-04-30 03:56:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29

MD5: fb422bdeaa7d40654f62f31d3b3ad911 SHA-1: ab472e3fee1c3584c57ad2d4b80705759286a097 SHA-256: 8b478e6c9ef0cb18407d7379ca435765591ee21edde9f919bc9b143c08c341c2

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm. The embedded content, though heavily obfuscated, likely serves to redirect users to malicious or phishing sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

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://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160828a4b226b2---waxiwu.pdf In PDF document text
- https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/a85c07e685f73a2d016ed30b930e6687/38654561587.pdfIn PDF document text
- https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/ov01v8b3435tkduiv6qa224tqf/vevarukogavigizexega.pdfIn PDF document text
- https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/8e0f2e603d81190eda6fe3a5f4a55252/9174106247.pdfIn PDF document text
- http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/f1b73dc464630ad40484fed672f305dc/wejorukutigegozezuf.pdfIn PDF document text
- http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/cc5689bc3bb39187abb7916188ae8351/ratigifufafutav.pdfIn PDF document text
- https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086ca73e0b68---7154899291.pdfIn PDF document text
- https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/9ea468280d6432e8baf6bd2a9d204970/83957742356.pdfIn PDF document text
- http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085e6a8f1853---26726465908.pdfIn PDF document text
- http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16084cedfe906f---povikinoxen.pdfIn PDF document text
- http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/qj19e77nfu551sm28a8c1sf2e5/gufatidixakupedinev.pdfIn PDF document text
- https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/p17cql1e2ij1s6tu21qaggpo4g/dorunovejirizoropuwivikaf.pdfIn PDF document text
- https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/g61u4a8dgkr2g8rtdc91ch2bj1/defulitaxu.pdfIn PDF document text
- https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/dglbl12flg73f1n91ee4bcfpr0/sufuj.pdfIn PDF document text
- https://encoregallery.us/wp-content/plugins/super-forms/uploads/php/files/7f5884a88f8fceee1d0d6f3449be2991/31684015453.pdfIn PDF document text
- http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160755ae29cb2c---gurusonagubuligigifozet.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=grouse+hunting+guides+in+northern+wisconsinPDF link annotation
- 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://scripts.sil.org/OFLIn 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_off0000eada.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEADA	5080 bytes
SHA-256: `7afe45c505f984cd2ed72ed26baf001ae64bd7f669e651d33ac8442cc4782db8`
`font_01_sfnt_off0000fc34.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFC34	10588 bytes
SHA-256: `e36e329a614cba8df9190b2d4bc3be45033a395fcc9cfbd464db9334c7fbce5b`
`font_02_sfnt_off00012030.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12030	17548 bytes
SHA-256: `a99d91f4bac1bd85f416011e5cfa80b8e883223f5b1a4ef6b591313a6da7478d`

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