PDF malware analysis — malicious · c79af9e6019d480d

MALICIOUS

PDF

88.5 KB Created: 2021-07-05 08:06:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: a06ff8fababaf1bd3056d6f4cdd60103 SHA-1: a751922fc2cc0a082227ebe11c34c6eaa4253d36 SHA-256: c79af9e6019d480d05ab797c5cc60b557571a57359f7bcce89f0a568242482dc

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many of which point to websites hosted on compromised CMS platforms, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, providing no direct user-facing content to analyze.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

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 http://ukicda.com/admin/fckeditor_upfiles/file/2021070316175980554.pdf In PDF document text
- http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749fdec502b---sekunulub.pdfIn PDF document text
- http://mdbim.pl/ubezpiecz/obrazy/file/323508835.pdfIn PDF document text
- https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a798cb1139f---32351568614.pdfIn PDF document text
- http://modnyi-buket.ru/uploads/files/58206149857.pdfIn PDF document text
- http://romanakladatelstvi.cz/userfiles/file/89311630144.pdfIn PDF document text
- https://ukmalayalamnews.com/userfiles/file/jepotizuworal.pdfIn PDF document text
- https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/1mafjgpmjmtt7t355h331ee6ej/37012282075.pdfIn PDF document text
- https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/387034dcc0138453d6c5f3597dbdc59a/34384488829.pdfIn PDF document text
- https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/u1i0n63i579ksngsh65so02am4/86371071557.pdfIn PDF document text
- http://purofirstli.com/userfiles/files/80379041156.pdfIn PDF document text
- https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/cr1e0vbr5gt82gtrijdp4dqrhv/bofepakepigu.pdfIn PDF document text
- https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f6ba2c022---43777010615.pdfIn PDF document text
- https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160836867f1f8c---berakapazuzedobelozuxem.pdfIn PDF document text
- https://ppuhperspektywa.pl/files/edytor/file/87654186193.pdfIn PDF document text
- http://mayinluatudong.com/uploads/userfiles/file/vuvolo.pdfIn PDF document text
- http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8dfee0cb1---74578190167.pdfIn PDF document text
- https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfadb67b276---jozaliludodobewexin.pdfIn PDF document text
- https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/2063630be16ec54ace4c37fb8ab9a60a/50853079872.pdfIn PDF document text
- http://iwilldoit.ru/uploads/files/files/77352286209.pdfIn PDF document text
- https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/089m6uu6bidb59lrfs73s7gvoo/47601093531.pdfIn PDF document text
- https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/2fbf875b3aa16d4fd9b81ba52759513c/83322387220.pdfIn PDF document text
- https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160792cc1eb6e4---97621348772.pdfIn PDF document text
- https://bishopsalamatkhokhar.org/userfiles/file/nemikikixupivadegi.pdfIn PDF document text
- https://zhansq.cn/upload/file/13076361653.pdfIn PDF document text
- https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/383047cd43df836a54041b4023dfbac7/miler.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=in+hydroelectric+plantPDF 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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f994.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF994	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off000111a6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x111A6	16820 bytes
SHA-256: `b85645b47a0055d434a62f752c8a75600b29bc33c798ab863a49ec3fae218504`
`font_02_sfnt_off00013d08.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13D08	10508 bytes
SHA-256: `5ef920e876473f4a441659b3b2f29a6b5d0204df00a00134514c3b838004dcda`

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