PDF malware analysis — malicious · 9b42a7a71c49330b

MALICIOUS

PDF

88.9 KB Created: 2021-06-27 11:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: 02fbe1997b283e609da0fd52a0886257 SHA-1: 6fa8f6300f2736a02d83d58388c0f20a91ff4ef8 SHA-256: 9b42a7a71c49330be3892de07fc68bb87d69fc6fb0e18a63787c529cd65fcc31

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The ML classifier strongly indicates maliciousness, supported by numerous heuristics flagging the PDF as a link farm pointing to compromised CMS uploads. The document body is heavily obfuscated and unreadable, but the presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious sites. No scripts were extracted, limiting the analysis of specific execution chains.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

Heuristics 5

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://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b0bcbe517ce---gepuvevosakunadunuje.pdf In PDF document text
- http://parbatsamajjapan.com/img/files/files/85040567983.pdfIn PDF document text
- http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/mf6mo94j2irabpd4q071ino2e6/penarow.pdfIn PDF document text
- http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2c92c181c---33635070209.pdfIn PDF document text
- http://yuhongzg.com/d/files/xaxaneraba.pdfIn PDF document text
- http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982e2f5013b---73414899393.pdfIn PDF document text
- https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/mlkgavsjuq9qikqgmvuno1dnl8/93210562104.pdfIn PDF document text
- https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/vk1v5fb126rndlrogr75on5ojf/73963924061.pdfIn PDF document text
- https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/j2ffl98acjosnaohkupctgma00/fosulatimimikilidovipol.pdfIn PDF document text
- https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/e82d1f77bdd6fc5f11666fe7d6e90e14/67522147685.pdfIn PDF document text
- http://kartinatv.org/uploads/files/74363075613.pdfIn PDF document text
- http://krevue.cz/UserFiles/File/87018307834.pdfIn PDF document text
- https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098314c8762b---7435093830.pdfIn PDF document text
- https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/th284c1ujh2ecq2sjn8bkd2093/patijem.pdfIn PDF document text
- https://photojet.bg/userfiles/file/15833321809.pdfIn PDF document text
- https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b836e6a6097---lipoduxojamewurapabatitip.pdfIn PDF document text
- https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/7nm37evbjjiul3rk7docbdtkd3/28899610027.pdfIn PDF document text
- https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/q14rca4o03dvo0v4abln48c9vu/60751286229.pdfIn PDF document text
- http://dashoernerboot.de/userfiles/tevado.pdfIn PDF document text
- https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a15c15db1ed---jikokir.pdfIn PDF document text
- http://caydinhlang.net/userfiles/image/file/balemugipiza.pdfIn PDF document text
- https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/57259196411fb59127200bc2132da1c3/16512231464.pdfIn PDF document text
- https://matrainagycsalados.hu/userfiles/file/2689950844.pdfIn PDF document text
- https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607269a9a04e4---wisedezobozalojurimo.pdfIn PDF document text
- http://babamoleskine.com/files/file/tulorojiwotonaw.pdfIn PDF document text
- https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/3d30f443c44895a6a4eadf0162b2600a/38454435952.pdfIn PDF document text
- https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/4846390b1bb09860af6c491e8a0c53d8/84448941877.pdfIn PDF document text
- http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608264f87f8b5---47978345272.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=the+owls+and+hooters+watch+onlinePDF 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_off0000f534.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF534	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010d46.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10D46	18112 bytes
SHA-256: `36ff5fca8df5cc3c137c610ee693d2c22ed667a8302218ff63cd182f74e2f1bb`
`font_02_sfnt_off00013caf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13CAF	10516 bytes
SHA-256: `68dd9222910f5afb7cb6e9e7838921929e2d9f79116b77801030608d5137788d`

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