PDF malware analysis — malicious · 90b0f280ec47454b

MALICIOUS

PDF

83.0 KB Created: 2021-07-20 20:11:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 384ef5853f18a03ece00655f68ede134 SHA-1: 30f23f6ea015451ced2ae525683b77aa814fdcbb SHA-256: 90b0f280ec47454babbb3d8c6f6d6bfae3d67830996b2556c19ba887180bc096

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains a link farm pointing to multiple distinct hosts, many of which are hosted on compromised WordPress sites or disposable domains, suggesting an attempt to obscure the ultimate destination or distribute malware. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

Heuristics 6

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.
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://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16079b4e39ff94---11617473301.pdf In PDF document text
- http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pudonamezituku.pdfIn PDF document text
- http://namngonviet.vn/user-/files/90386420957.pdfIn PDF document text
- https://badrivishal.com/media/woriritulex.pdfIn PDF document text
- https://aduanaldelvalle.com/userfiles/file/86588713251.pdfIn PDF document text
- http://hzdsbg.com/uploadfile/1626098513.pdfIn PDF document text
- http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160702991113e0---tefenozetadaxo.pdfIn PDF document text
- http://jkohut.pl/file/44393903529.pdfIn PDF document text
- http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6ac7e22a2---28945995386.pdfIn PDF document text
- http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/84933751050.pdfIn PDF document text
- https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/a0c32c479d9851863b1ce402f84e5bd4/xomenatuxadopin.pdfIn PDF document text
- http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cbdbeb0c487---46065034231.pdfIn PDF document text
- http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/ms8o15tf6avioaki7ma3fhk6m2/1451820392.pdfIn PDF document text
- https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/6375e599f2504689e1e9adc97f293331/fimeken.pdfIn PDF document text
- http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nasigame.pdfIn PDF document text
- http://yorktownhs1987.com/clients/57482/File/33069370986.pdfIn PDF document text
- https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bbcbd755afd---suvetewevaribulosokiten.pdfIn PDF document text
- http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160de19a1d7680---77269978061.pdfIn PDF document text
- https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/a191da3f8e608e289483e824211f927b/fazekibudupisebijidi.pdfIn PDF document text
- http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607bad446776a---95048402781.pdfIn PDF document text
- https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/236b2a62112e9fb31a4dec74235286dd/nikabu.pdfIn PDF document text
- https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/9jajpht6jfks1mbataobiorh4k/41948718267.pdfIn PDF document text
- http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/v8gvqj0jbnabadvjtduj41aduf/36091109256.pdfIn PDF document text
- https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/firipagaditu.pdfIn PDF document text
- http://willbramephotography.com/ribejemevavugedegikasuzu.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=calories+in+a+slice+of+pork+loinPDF 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_off0000e296.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE296	16824 bytes
SHA-256: `9e38f2dc5fbf411da6c0ec4c04d94c61d1d4f3876d54a590d6b88398d9c1bf6a`
`font_01_sfnt_off00010e7b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10E7B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012692.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12692	10496 bytes
SHA-256: `89faf79107eb3ed45491b11f3675c3e0c7a584e2d7888f2d144f2ba70f296920`

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