PDF malware analysis — malicious · 2130f80cd0ee6441

MALICIOUS

PDF

116.5 KB Created: 2021-09-02 09:56:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 7d09f043ff77bd50ca32f58e49f4a61f SHA-1: c3b5c4e95f7c27e5167b1255654176145e58e196 SHA-256: 2130f80cd0ee6441b19d41a8cfdd4816bdc81dab538734e6787d24e231d52812

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating link farms on potentially untrustworthy domains. The ClamAV detection and ML classifier further support its malicious nature, likely for phishing or distributing further malware. No scripts were extracted from this sample.

Machine Learning

Nyx PDF Classifier malicious score 0.6777

Heuristics 5

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
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://ketchas.ru/uplcv?utm_term=how+to+draw+a+face+from+a+picture PDF link annotation
- http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/8373684745.pdfIn PDF document text
- https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd47de5440---30322591808.pdfIn PDF document text
- http://n2nnetworks.com/files/others/wemiduselepizukebana.pdfIn PDF document text
- https://arch.ua/ckfinder/userfiles/files/5146368596.pdfIn PDF document text
- http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612cb4d2bad1f---85516441328.pdfIn PDF document text
- https://sjalikave.hu/pictures/file/81830434717.pdfIn PDF document text
- https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/9f93c6e21bcc1e3d49346ee3392df35c/83759687709.pdfIn PDF document text
- https://loctra.net/userfiles/file/73361347370.pdfIn PDF document text
- http://hillsdalehorseboarding.com/ckfinder/userfiles/files/xulor.pdfIn PDF document text
- https://lawrenceyezersky.com/userfiles/file/bodixumowovojasosi.pdfIn PDF document text
- https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cf340d48ceb---jejozuxogizanidunubarigi.pdfIn PDF document text
- https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f370f90fcd---fusisutaradadu.pdfIn PDF document text
- http://danchrisjewelry.com/userfiles/file/zabikupofufinixamotukalut.pdfIn PDF document text
- http://carbonelite.ru/file/96119380249.pdfIn PDF document text
- https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f94fe6ecc8---25120384463.pdfIn PDF document text
- https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/17a48a3529384e4b32428fc81d359b1d/dibukepofogodopawomuti.pdfIn PDF document text
- http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/jedagukexunagisinutewus.pdfIn PDF document text
- https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/eb51357820e8aa8edd6e7a363a1c2428/wularitilutakaxulubus.pdfIn PDF document text
- https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/691f89bab61ecb5061cf9460facbdaf9/58215743082.pdfIn PDF document text
- http://hyundaidongdo3s.com/images/files/32449668665.pdfIn PDF document text
- https://tsafar.ir/basefile/tsafarir/files/12269329040.pdfIn PDF document text
- https://thebillionbottom.com/business_school/uploads/file/tudijakufozenosimaxux.pdfIn 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_off000171b0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x171B0	10640 bytes
SHA-256: `f91719567690d369c19b7ab4c24530d3fb62000c1dffea8f29e4e04a8dfd609f`
`font_01_sfnt_off00018a18.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x18A18	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001a22a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1A22A	19160 bytes
SHA-256: `027967c0fce1a9ececfe48cad4e2c150d925efae28a0975222318edb3c6bc9a0`

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