PDF malware analysis — malicious · b5191b500a140c7a

MALICIOUS

PDF

82.8 KB Created: 2021-06-27 01:03:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: 2c90993e5a1aed72c7c44d31f1d4f1bb SHA-1: be89ba7e0a303099bbac57e9d965230262d77550 SHA-256: b5191b500a140c7a406673e116cf9ce2b6d0303c3b8e8efb23e30abf89fc5dc2

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and potentially disposable hosting domains. While no scripts were explicitly extracted, the nature of the link farm suggests it is designed to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9928

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://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f096b2b7c5---30242394081.pdf In PDF document text
- http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/b160f6078c8c94c7fb3c30da9444c6a9/narugad.pdfIn PDF document text
- http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607909ed7f0fa---15544009956.pdfIn PDF document text
- http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16092f1bf2c9c2---15987892378.pdfIn PDF document text
- https://nhachoxebus.com/upload/fck/file/65623571493.pdfIn PDF document text
- https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/c55799086f261d86018699d05d77e45e/tuvebuledegu.pdfIn PDF document text
- http://baigeleather.com/userfiles/file/70614939030.pdfIn PDF document text
- http://begemot-rus.com/uploadfiles/file/2021050118120273499.pdfIn PDF document text
- http://hattingtoemrerogsnedker.dk/userfiles/file/sogotekobefetatufozem.pdfIn PDF document text
- https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/868d8824f988b562be3f0c1ca8c8b3da/watanis.pdfIn PDF document text
- http://v-lukomorie.com/uploader/files/zezifusazelanovufibupa.pdfIn PDF document text
- http://ibtaker.ps/userfiles/file/paxanabemekipu.pdfIn PDF document text
- http://lookkorea.net/userfiles/file/ruzamezeduz.pdfIn PDF document text
- http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794c669a152---43176420684.pdfIn PDF document text
- https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/67a11ed5e115632717968d9a7ca86666/kifol.pdfIn PDF document text
- https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/e6497ddd54c8aa707e3f8e93617e09e6/90884501993.pdfIn PDF document text
- http://okwecare.com/usr/userfiles/files/57990381611.pdfIn PDF document text
- http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16089a4b4f05aa---85259875500.pdfIn PDF document text
- https://sambelteri.com/contents//files/55573127022.pdfIn PDF document text
- https://intrigantka.ru/images/userfiles/file/muwaxuwewafupi.pdfIn PDF document text
- http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9c4a043e3---73963657797.pdfIn PDF document text
- https://ksboutlet.com/file/files/46719687430.pdfIn PDF document text
- http://hocikto.info/userfiles/file/40749004619.pdfIn PDF document text
- https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/a0899fc91fd46a41af2901db53c9046c/58524884690.pdfIn PDF document text
- http://videofilm-tv.ru/content/File/gafutitozafixuj.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=exponent+meaning+in+gujaratiPDF 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_off0000d637.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD637	10696 bytes
SHA-256: `ab827ef66ef68e6c9d0345c553ea3fd267404979396e798179e146400a17108d`
`font_01_sfnt_off0000eea0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEEA0	1700 bytes
SHA-256: `15171638d69c9281a983de8a04f8d213e5ed86d33053034f6aa0dd130c4010d8`
`font_02_sfnt_off0000f6b3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF6B3	18380 bytes
SHA-256: `7180fc358fa0812335d36154f7261000773d602c3d47532e73e0debc21fa2096`
`font_03_sfnt_off00012554.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12554	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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