PDF malware analysis — malicious · 53c36fb5d944ba68

MALICIOUS

PDF

78.9 KB Created: 2021-09-05 18:34:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 27a87d826df8f053858a4f3517191eb9 SHA-1: a55b977d08c94be9b132dd14679f86c978cf0621 SHA-256: 53c36fb5d944ba68b652f63ae8d55794e8cd60341e758cdcc80d2a9622d6c711

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous embedded URLs, many of which point to compromised WordPress installations, suggesting a phishing or malware distribution scheme. The presence of these links indicates an attempt to redirect the user to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9949

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://archism.ru/uplcv?utm_term=canterbury+tales+nevill+coghill+pdf PDF link annotation
- http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f08ccd71d---86214613437.pdfIn PDF document text
- https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/gldg2i9i599ukgtlaugal8d1si/vavoretumunikusotobiwe.pdfIn PDF document text
- http://reelproductionshd.com/userfiles/file/47621934459.pdfIn PDF document text
- http://irishheritagesociety.net/clients/7/7f/7f3653e4c5d791bf76f28d2bf9929747/File/52633400653.pdfIn PDF document text
- http://reelproductionshd.com/userfiles/file/bijusujinedisufu.pdfIn PDF document text
- https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607907f93b6da---kuziwimobozavutonob.pdfIn PDF document text
- https://havadisname.com/upload/ckfinder/files/2145071022.pdfIn PDF document text
- https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e26791c374---jazeja.pdfIn PDF document text
- https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/1df20d76f18e01f4e08927c96b71a379/87088506104.pdfIn PDF document text
- http://langeline.com/ckeditor/upload/files/rijowekezevuxoli.pdfIn PDF document text
- http://langeline.com/ckeditor/upload/files/83404754923.pdfIn PDF document text
- http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609edbcb0c86a---xabogakisisurutit.pdfIn PDF document text
- http://andlupa.com/userfiles/file/wuzavunudesu.pdfIn PDF document text
- http://www.supair-lux.hu/ckfinder/userfiles/files/85245929146.pdfIn PDF document text
- https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/b3513cf2ea9a2a6b6e133aebf7884fd2/vetefapifaduxasaxeni.pdfIn PDF document text
- http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b080bc6ae---51973298508.pdfIn PDF document text
- http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f19b496c1---6777534523.pdfIn PDF document text
- http://susasoft.com/upload/userfiles/files/jikevovujefaboxo.pdfIn PDF document text
- http://drive4smilesontario.ca/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/zowufufugenaneralix.pdfIn PDF document text
- https://muguet.fr/sites/default/files/file/18827227619.pdfIn PDF document text
- http://centrons.com/uploaded/file/10382305760e01b5a94c1b.pdfIn PDF document text
- http://co-wemart.com/careeruserfiles/file/1176282122.pdfIn PDF document text
- http://jfhconsultancy.nl/userfiles/files/32185976262.pdfIn PDF document text
- https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/951dc68e88ba18ec8483c07577405f97/wunibaw.pdfIn PDF document text
- http://arunimaflavours.com/userfiles/file/68524651420.pdfIn PDF document text
- 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_off0000cab9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCAB9	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000e2d0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE2D0	11352 bytes
SHA-256: `41e036e52c36408dfb7c08e199ebebd44678a15e6fff51f00ae78b6f3aa03bdd`
`font_02_sfnt_off0000fd19.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFD19	18664 bytes
SHA-256: `f8aba23962595a6665f7f84b4d8d7c0a1fe94d56e5838059712f3a3e6debb5ee`

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