PDF malware analysis — malicious · dfe35886276db4ea

MALICIOUS

PDF

799.6 KB Created: 2021-08-15 15:13:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 9e6ca07bad59ef0b3586b1588e2d8c90 SHA-1: f64991b24531710177ac654e0e7c7ec2f16f501c SHA-256: dfe35886276db4ea2c8af87f44de0ef26737b9dc4f9ad8738e614a16afebd05e

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, with heuristics indicating it contains external URIs and points to compromised CMS upload storage. The embedded URLs suggest a phishing or malware distribution attempt, likely leveraging a spearphishing attachment vector. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.6318

Heuristics 5

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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.
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://universal4shipping.net/userfiles/file/munabitudovebez.pdf PDF link annotation
- http://www.cddfct.com/up_files/file/23517577425.pdfIn PDF document text
- http://ouhkpthaa.org/userfiles/59509560878.pdfIn PDF document text
- http://pospatrans.cz/UserFiles/File/puginobi.pdfIn PDF document text
- https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/02730758f48bd4753d6f0d22fa77834c/judorefugadatupemogexawod.pdfIn PDF document text
- http://yao-cheng.com/uploadfiles/20210729063635.pdfIn PDF document text
- https://digireg.pl/upload/12262872275.pdfIn PDF document text
- http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bafea9b3d---tevevum.pdfIn PDF document text
- http://dinskayarealty.ru/media/file/65895270563.pdfIn PDF document text
- http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607018fff078b---19167889647.pdfIn PDF document text
- https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/5vg5if8qaro41t1qbehie686iu/86966730647.pdfIn PDF document text
- http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ee49653f4f9---xutolixux.pdfIn PDF document text
- https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/8ecf8d94bf3953b3aa75ed4d1e3efe9e/dozibati.pdfIn PDF document text
- http://3xlove.com/uploadfile/file/famidifosat.pdfIn PDF document text
- https://md-bud.pl/szklo/photos/file/wivijusasotejidi.pdfIn PDF document text
- http://lctrading-gmbh.com/ckfinder/userfiles/files/73061877012.pdfIn PDF document text
- https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/e6364c3867c97aa68bb85fcd63730b33/48000769576.pdfIn PDF document text
- https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/neoc4v4aubq8beie4n15103jjg/71561872782.pdfIn PDF document text
- https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/dea5ae9233a872eb1388987b34432c44/82530658174.pdfIn PDF document text
- http://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/70514030025.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off000be762.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBE762	11164 bytes
SHA-256: `6a5a841ed087960d24f838ccd9cb05580c80f2ef5e78caeb5162e5fa928063d1`
`font_01_sfnt_off000c015a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC015A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000c1978.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC1978	23856 bytes
SHA-256: `1b4b8c92e3c801f8b28790f8a07a14254165b167981167387e740fb95e28e8ec`
`font_03_sfnt_off000c545f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC545F	16140 bytes
SHA-256: `00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b`

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