PDF malware analysis — malicious · 4f7fa08298bc9657

MALICIOUS

PDF

75.9 KB Created: 2021-09-22 12:45:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 6d5840d5e76e1628fc843b5a849520cf SHA-1: 472973a1d98ed81a2c575cd19cec97561659a665 SHA-256: 4f7fa08298bc9657118b5e30b8d1d9ff256be229f6216eb8b325af4ded808f60

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple heuristics indicating it is a link farm, with many URLs pointing to compromised CMS upload storage. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of numerous unknown reputation URLs reinforces the suspicious nature of the document.

Machine Learning

Nyx PDF Classifier malicious score 0.9840

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://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614af1dc754ff---55139840069.pdf In PDF document text
- http://1night2day.com/UserFiles/file/nugabuguviwikarivul.pdfIn PDF document text
- http://novichiha.ru/pic/file/82160379073.pdfIn PDF document text
- http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144bf5439ad6---94993961673.pdfIn PDF document text
- https://kitapkapla.com/upload/ckfinder/files/rijuro.pdfIn PDF document text
- http://culfordequestriancentre.org/UserFiles/file/zosotepudiloje.pdfIn PDF document text
- https://maxflowfans.com/userfiles/file/moner.pdfIn PDF document text
- https://www.bevillelecomte.com/ckfinder/userfiles/files/dasajuga.pdfIn PDF document text
- http://wakabaeducation.com/userfiles/file/xufetutejurakepunimasoror.pdfIn PDF document text
- http://bedrucken24.de/userfiles/file/13857951235.pdfIn PDF document text
- https://rajakedua.com/contents/files/jupofenawasojo.pdfIn PDF document text
- https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac9ea1d3b2---71171222214.pdfIn PDF document text
- https://htapigroup3.com/contents/files/pewibuzu.pdfIn PDF document text
- https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/d87df071c8182b69f362562032fcdf7d/bojuduf.pdfIn PDF document text
- http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16147b7fb6cdeb---53060668246.pdfIn PDF document text
- https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/161370f6a3f5f0---poteluvaduduloruzez.pdfIn PDF document text
- http://www.cottagegrad.ru/files/file/bumaxadipidunuz.pdfIn PDF document text
- https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/165f8f877645ccc2d5fcb98f2e40da5d/gibikato.pdfIn PDF document text
- http://maketmaster.ru/admin/ckfinder/userfiles/files/57692280809.pdfIn PDF document text
- https://purmoradiatoriai.lt/images/files/ranasubomibapezadir.pdfIn PDF document text
- http://radiosalsa.fr/php/rs/filesupload/file/fisokadinobe.pdfIn PDF document text
- http://hnyinfeng.com/d/files/lomexedatadunexunawisirop.pdfIn PDF document text
- http://hbisan.com/userfiles/file/66567113542.pdfIn PDF document text
- http://nguyenthaotech.com/upload/files/dufamisazebebopijadojalib.pdfIn PDF document text
- http://abwlargo.com/uploads/files/naxofebulenijujejubejaja.pdfIn PDF document text
- http://bayernglobal.de/userVZ/file/40184636238.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=up+hill+racing+apkPDF 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_off0000c43a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC43A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000dc51.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDC51	10232 bytes
SHA-256: `4f7201cbd2efae493f1d18b36abe56155f6e7d02e0c38a954b798d22ae452a6b`
`font_02_sfnt_off0000f329.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF329	18164 bytes
SHA-256: `638aae83dd136e1d39b0947ca462d9d54186d15a5822cb7a6b189d0f130c3d61`

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