PDF malware analysis — malicious · 05a6bbd2ad6166d7

MALICIOUS

PDF

104.0 KB Created: 2021-06-27 06:08:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25

MD5: b4dad3c8e0b797d19a64b071ceb6c401 SHA-1: 1384dbf7c6726da78a877534da220e828a7d4da7 SHA-256: 05a6bbd2ad6166d77a2871ac9700e16ff5c76c6f5bebd93c95bcc03e8f5e681a

196 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of external URIs and the nature of the heuristic firings point towards the document acting as a lure to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9773

Heuristics 7

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK

PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
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://irlanc.ru/uplcv?utm_term=individual+fixed+effects+stata PDF link annotation
- http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbbd9c8c20---gudozekom.pdfIn PDF document text
- https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/562890d3870b8961cc186f4d53e3caa7/75062961741.pdfIn PDF document text
- https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/9aedd27b4758f25f6cd56679492adedc/82085602340.pdfIn PDF document text
- https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c8e74acb3---19962342003.pdfIn PDF document text
- http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a34d65980cc---xuvazividaroxux.pdfIn PDF document text
- https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/3148806201bcb24aebb1bea84fab8b4e/9071272887.pdfIn PDF document text
- https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/25dcf8e691c42ba24ecaa1e7f9673142/fipibizotapotu.pdfIn PDF document text
- http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/47911360811.pdfIn PDF document text
- http://extintoresorigen.com/images/editor/bubajizafe.pdfIn PDF document text
- http://teplospectr.ru/images/files/45649231859.pdfIn PDF document text
- https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/c7ea7fe9cfd155373c5d7b4587ef1fec/xamovaredatejidoser.pdfIn PDF document text
- https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c38e5e419b---fujuwosomelebogefemub.pdfIn PDF document text
- http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ceb3c7e6639---sirusazamemebesonusafibap.pdfIn PDF document text
- http://slbreakingnews.com/ckfinder/userfiles/files/76335468890.pdfIn PDF document text
- https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab9711cb56---14599144950.pdfIn PDF document text
- http://suachuabaoduongmaynenkhi.com/img_quanganh/files/fobusimiliwe.pdfIn PDF document text
- http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/alh6231q904fci42hcmiv98573/nemuduxuluw.pdfIn PDF document text
- https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/qnq8nv48ml3p66ba5akpv7m4pd/tuviwivixariwowivus.pdfIn PDF document text
- https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/119cc4a03848690ba9c823b5d38a03a4/39168394630.pdfIn PDF document text
- http://abwcrainhwy.com/uploads/files/56025880540.pdfIn PDF document text
- https://szabobuszrendeles.hu/files/files/nikujusodo.pdfIn PDF document text
- https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/5352a0acd8d6153472217b4e47aa7a0b/26339716851.pdfIn PDF document text
- http://carrozzeriabosini.net/userfiles/files/49851468418.pdfIn PDF document text
- http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607616a482e83---62716821369.pdfIn PDF document text
- https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/quu2r7tmirn5vlr2ti87kiu6cq/posejikijawafosasu.pdfIn PDF document text
- https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b154803bbd0---dapajigelubetekukofepikaj.pdfIn PDF document text
- https://pametnidom.hr/pametne_kuce/userfiles/file/voxidufesur.pdfIn PDF document text
- https://advantagelic.com/singhania/downloads/file/16720445846.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_off00013130.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13130	10468 bytes
SHA-256: `5cf7a1996366434e30340d28a5d4b9c9a7088073b0dceed235c39812452ab07f`
`font_01_sfnt_off00014919.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14919	18152 bytes
SHA-256: `44a68f6a154902ef1506521befd7fd045ae4cad301228b0d8ef0bd6e86ca486c`
`font_02_sfnt_off000178e9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x178E9	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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