PDF malware analysis — malicious · f531906b3fb6b86e

MALICIOUS

PDF

95.8 KB Created: 2021-06-29 22:11:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: f437609d5554923cd46027197d59c2b7 SHA-1: eb924b4a66479ec5a9c5270f99af3d062792f39e SHA-256: f531906b3fb6b86e2b0df06c5a44abe0008bf99a784c0e7b017288374dca8e13

164 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 contains numerous links pointing to compromised websites, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of external URI heuristics and compromised CMS upload links further supports this attack pattern. No scripts were extracted, but the overall structure and URL findings point to a phishing or malware distribution lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9927

Heuristics 7

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.
Urgency / deadline lure low SE_URGENCY_LURE

Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
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://crewmak.ru/uplcv?utm_term=vince+gill+concerts+2021 PDF link annotation
- https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cf17d4f8b---17467163875.pdfIn PDF document text
- http://panziofabian.hu/fck_kepek/12937227094.pdfIn PDF document text
- http://www.cerathai.com/image/upload/File/semegojuju.pdfIn PDF document text
- https://franchiseharbor.com/files/files/27590865043.pdfIn PDF document text
- https://alexandrapanayotou.com/web/images/static/file/50183088638.pdfIn PDF document text
- https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/bcf5e687fe269f0fc10b5a47b98b3838/3885137519.pdfIn PDF document text
- https://hohsingfiber.com/ufiles/files/69161155921.pdfIn PDF document text
- https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5efa1077be---bafamuzesoguwari.pdfIn PDF document text
- http://lacasedescaraibes.fr/file/61724875165.pdfIn PDF document text
- http://tortsurprise.ru/upload/redactor/files/dozekirawamixituwe.pdfIn PDF document text
- https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/2ad65bb9cb8d6673a2eb2b6cd25e56ec/54987026409.pdfIn PDF document text
- http://anandtouristcorporation.com/uploads/sozamewowojiviro.pdfIn PDF document text
- https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9988b803c---40072985225.pdfIn PDF document text
- https://agermag.ro/mm/file/92076385477.pdfIn PDF document text
- https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/863773708a286523aab064863cb98bf0/rokekamasetibulupewo.pdfIn PDF document text
- http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160a477f3684fe---6600950795.pdfIn PDF document text
- http://ei-windykacja.pl/upload/file/ridebog.pdfIn PDF document text
- https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/e748f5c50758c52bcca2345eeef339e3/sunosikegalevajepimejutit.pdfIn PDF document text
- https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/dof8ld392dpibs4o2nd2g5qhe2/jatenobiravukides.pdfIn PDF document text
- http://zhodnoceni-penez.cz/is/images/FCKeditor/File/37996265198.pdfIn PDF document text
- http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4ec3a9743---7667992762.pdfIn PDF document text
- http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/75a65fec3e4c4c2691a097e64127485d/62562753316.pdfIn PDF document text
- http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/hvv3o8o9vmg1qvnhglikskp0e6/vozeruretenutatexalaxus.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
`stream_002_off0000f1ac.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xF1AC	18428 bytes
SHA-256: `c5fef0ab0dc38ea51e6468a07cc624cb8eff6fdb376b2599316526321e0b83b2`
`font_01_sfnt_off00010f15.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10F15	10508 bytes
SHA-256: `aa0b22d638fd6c3cba66d9a96d9198dcb8d7ce93cc98f69ac17e93eb34c01f3a`
`font_02_sfnt_off00012734.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12734	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off00013f46.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13F46	18588 bytes
SHA-256: `b94bc18d1c98b61392361ff31c727632fd9f6a23acb0ad2025d94c16b700a4be`

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