PDF malware analysis — malicious · 627423df8710fa4e

MALICIOUS

PDF

89.4 KB Created: 2021-07-04 17:59:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: b9fd9679f8a2d8090eb09304c6c936e3 SHA-1: e808e2e7c3857e25ab3c22fe441c9b6254838adc SHA-256: 627423df8710fa4ee678e8ea6a1459810f3bdba3df83ff21fbb96cbccb9e1fc0

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to websites hosted on compromised CMS platforms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and appears to be non-readable content generated by wkhtmltopdf, rather than user-facing text.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

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://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c4gkp7birh0re4if34l78m4eu0/subozirazatuwudida.pdf In PDF document text
- http://baigeleather.com/userfiles/file/tazosunuba.pdfIn PDF document text
- https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a191aaf0b1f---84770697791.pdfIn PDF document text
- https://bititechnika.com/uploads/file/pevidujuxefa.pdfIn PDF document text
- http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce6618c87f---67718218685.pdfIn PDF document text
- http://moyamoya.center/images/hand_uploaded/files/73195881862.pdfIn PDF document text
- https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/th97s8rvhh9jum54uabagigo56/zokisewaduzoduvozamame.pdfIn PDF document text
- http://wardwrightself.com/clients/863644/File/76422260477.pdfIn PDF document text
- http://barcelonasixtytwo.com/userfiles/file/demitefulav.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096fa4144641---fasonemaneriwod.pdfIn PDF document text
- https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/c63e9db7259b24f18615d7edad164e24/kokupuletemirodesab.pdfIn PDF document text
- http://uro-medical.pl/zdjecia/fotki/file/nakuvotusebepuwodalose.pdfIn PDF document text
- https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1d403d217---99556672731.pdfIn PDF document text
- https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a9485b02fb38c00dfb515c530f7e5563/lavedamusobarisivabedup.pdfIn PDF document text
- https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/4nqkhmdnrjvvghtha7sb6m34nk/navezufivabiwavumawu.pdfIn PDF document text
- http://anhuishangbiao.com/upload_fck/file/2021-6-9/20210609182739456530.pdfIn PDF document text
- http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d7cf0d591---votamanomigo.pdfIn PDF document text
- http://aldara-latinoamerica.com/userfiles/file/35855519205.pdfIn PDF document text
- https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098461111f0f---fujobixidofilukalorutijow.pdfIn PDF document text
- http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fe946b8ac---69286945195.pdfIn PDF document text
- https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c54879f3d---59155892023.pdfIn PDF document text
- http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/die02u3p4mfl6hopr6916hljqk/6336806237.pdfIn PDF document text
- http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aecfb9578d7---3335796852.pdfIn PDF document text
- https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/a727d0b8c1aea6932dc68aa37d2ba1fd/6625028464.pdfIn PDF document text
- http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ae8646e25---xoxetunanunekulesefiza.pdfIn PDF document text
- http://deaprogettazioni.it/userfiles/files/juzutebutezutimeweruduliv.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=the+essential+characteristic+of+an+entrepreneurPDF 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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f93d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF93D	16984 bytes
SHA-256: `85ee8bdfe44c0f1e529050cf3d647efc6d5c2d58fc38cd52b6ebbeba356afd7e`
`font_01_sfnt_off0001256a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1256A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00013d81.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13D81	10640 bytes
SHA-256: `7d7e3ee18db25c9bad05701f9f6375b2f4dc4dbae1b8fb72c47b23711f0ded8e`

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