PDF malware analysis — malicious · 2f311ef32bf9b3b7

MALICIOUS

PDF

116.1 KB Created: 2021-06-27 22:37:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25

MD5: 5869bc45477547aee4a8ca840bdb22f5 SHA-1: 5c73ef2c6dc1adfbd6808e20ef7dccb7d2b3b9b8 SHA-256: 2f311ef32bf9b3b7af5479e833cab641f987066231bfeeb9699dd883bdebf5c5

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs hosted on compromised WordPress sites and disposable domains. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics suggests a tactic to obscure the true destination or leverage compromised infrastructure. No scripts were extracted, but the extensive list of URLs points towards a phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9877

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://nomylo.ru/uplcv?utm_term=snake+plant+yellow+leaves PDF link annotation
- http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e776858d0---sunasufa.pdfIn PDF document text
- https://porterbrothersltd.com/app/webroot/uploads/gawobinedof.pdfIn PDF document text
- https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/52952d3e4e930436cea3bb2317389ad5/megumanetaxetadopofuwibad.pdfIn PDF document text
- http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830d601b683---xamasi.pdfIn PDF document text
- http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a098a1bc366---wirup.pdfIn PDF document text
- https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/pfjc22pf6th8gqcugvacn2di4o/95405339428.pdfIn PDF document text
- https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a936d33b3e---85342702297.pdfIn PDF document text
- https://medicentrumnz.eu/medicentrum/files/file/morenizijufutugapu.pdfIn PDF document text
- http://brmhn.com/userfiles/file/20210525034627_z7k7nz.pdfIn PDF document text
- http://riskhedgetech.com/uploaded/file/142280501260c0faabd715a.pdfIn PDF document text
- https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/49eea8a57e8fd4dfcbcf1926a96b04a6/90269952344.pdfIn PDF document text
- https://yucekalipmakina.com/tsrm1/img/userfiles/file/14619519152.pdfIn PDF document text
- https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091a1a1e3c68---75377802951.pdfIn PDF document text
- http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608479552b16e---81516410467.pdfIn PDF document text
- http://plncse.hu/php_data/file/62887888516.pdfIn PDF document text
- http://educationexplosion.com/clients/a/aa/aae59ec6301d25964842a0067e0ae100/File/70751483740.pdfIn PDF document text
- https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/5cde194674d21244da1d1ebbe4c552cd/14455685793.pdfIn PDF document text
- https://unique.global/wp-content/plugins/super-forms/uploads/php/files/91e8d146680cd7bb6e193ebf9efbc385/fotegawupinagipoto.pdfIn PDF document text
- http://dnepropress.net/files/file/zubix.pdfIn PDF document text
- https://propertiproperty.com/Uploads/userfiles/files/63295455458.pdfIn PDF document text
- https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2745d1b0cd---nadabokoje.pdfIn PDF document text
- https://universitecentrale.net/uploads/FCK_files/file/59222238384.pdfIn PDF document text
- https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/01a0e30a4ee233015d5d077e6024240f/90053858631.pdfIn PDF document text
- http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/78575851415.pdfIn PDF document text
- http://cnzgks.com/userfiles/file///88913373665.pdfIn PDF document text
- http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16086790bbf340---74300012885.pdfIn PDF document text
- https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/8e1d0ho78kacngm94uojl618v3/jesupinixoj.pdfIn PDF document text
- http://www.css-jp.com/upfile/files/2021/06/12/5283820114.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_off00016533.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x16533	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00017d4a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x17D4A	10484 bytes
SHA-256: `a2edb1be5359924b4019177164c0f23591afebe5f48a2389e56e12577f794b7b`
`font_02_sfnt_off0001955b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1955B	17380 bytes
SHA-256: `567d42fb3e0381d62ea9bcf3d31ffcc1ece30dd4f6f8b74ca04853ba0d3a4478`

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