PDF malware analysis — malicious · b477ceecf7814e7a

MALICIOUS

PDF

84.6 KB Created: 2021-09-03 14:23:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: 6921bffa85d3d34ea38084ea753c97a2 SHA-1: 5ba4ea6d5a74f5a393c9eba735a671205ec994ab SHA-256: b477ceecf7814e7ada2a6433f8053c04c09b149f62a58013e16214330f1b7a21

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Several heuristics point to the PDF being part of a link farm hosted on compromised WordPress sites, suggesting it's used to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the PDF and its hosting suggests it's likely a lure for phishing or malware delivery, potentially using embedded JavaScript for exploitation.

Machine Learning

Nyx PDF Classifier malicious score 0.9938

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://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae71db251da---jolodivam.pdf In PDF document text
- https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9e150f681---43932567828.pdfIn PDF document text
- https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/7a39f7def7219a6f72aa0e0c5add24ee/31559041384.pdfIn PDF document text
- http://xiaohecollege.com/d/files/wixubejagijip.pdfIn PDF document text
- http://ineke-ott.nl/keramiek-beelden-imagesfile/40488609899.pdfIn PDF document text
- https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/6tlv4b98il9hghkea8bos239f2/35467671030.pdfIn PDF document text
- https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/161263626a1019---soruxitapanutesini.pdfIn PDF document text
- https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4f46defea1---9112423232.pdfIn PDF document text
- https://skvacations.com/userfiles/file/34471678002.pdfIn PDF document text
- https://cafesca.info/ckfinder/userfiles/files/71953841566.pdfIn PDF document text
- https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160cf12c45991c---21644041003.pdfIn PDF document text
- http://quickvideo.nl/userfiles/file/nifalesozifilutesesubap.pdfIn PDF document text
- https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/89740a793489031f5b8d752d230b1f71/49858405949.pdfIn PDF document text
- https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea0fb0f0b1---mimesemajeru.pdfIn PDF document text
- http://szzxwx.com/Upload/Upload/file/202183041038558.pdfIn PDF document text
- http://exosportsante.fr/ckfinder/userfiles/files/wadafigamulaz.pdfIn PDF document text
- https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097173e35b2f---fejitolugifali.pdfIn PDF document text
- https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1bb8b0653---rapanawisipaduvamozazu.pdfIn PDF document text
- https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/abu5h1t9o8sh64mc7d2ika0g88/purijefogozus.pdfIn PDF document text
- http://gvs-russia.ru/admin/ckfinder/userfiles/files/newumixinelu.pdfIn PDF document text
- https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/19b591a721524da2a91fbf9f25ed3c7c/40052463840.pdfIn PDF document text
- http://21cedu.com/pds/userfiles/files/kokuv.pdfIn PDF document text
- http://gayaarchi.com/userfiles/file/20210826202415.pdfIn PDF document text
- http://premiercontractinginc.com/files/file/tusetewobodun.pdfIn PDF document text
- https://coevent.ru/upload/files/6732623926.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=lagostina+convection+toaster+oven+manualPDF 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://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_off0000c4da.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC4DA	10696 bytes
SHA-256: `8e1b9ea5ffe5180b4aa33135bb4523d951bc825abb759c9470dee31f0efef5b9`
`font_01_sfnt_off0000dd67.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDD67	16164 bytes
SHA-256: `a0f26d9ec2bc0bbc84dfb8c1a224a49f7f70479ac92e21d726acd811d43f3bd1`
`font_02_sfnt_off0000f308.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF308	22216 bytes
SHA-256: `2256c75fbfbdf49b9b2b692d99a5ada8f99c3045948742b51c742f0daad3efe4`
`font_03_sfnt_off00012a91.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12A91	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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