PDF malware analysis — malicious · 7de34439dbcd5af4

MALICIOUS

PDF

81.5 KB Created: 2021-09-20 09:45:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: e4121e7acadcf81353051ec0231a2cef SHA-1: 47b0616013406debac570e1845c3541f547ced58 SHA-256: 7de34439dbcd5af4661708fa439fb3ac96dceb2d961c4b3d7b794d32b09a9025

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to redirect users to malicious sites. Although no scripts were explicitly extracted, the nature of the link farm and the detection as a trojan indicate a likely intent to deliver a secondary payload or phish for credentials.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

Heuristics 6

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.
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.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/n0an1p21ipsv69s4aqbgue85kn/27494385244.pdf In PDF document text
- https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613930aba35a1---vanoxagimamila.pdfIn PDF document text
- https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/24403107703.pdfIn PDF document text
- https://abss.pt/userfiles/file/puzutudagatukenonegob.pdfIn PDF document text
- https://frenstravel.com/assets/ckfinder/userfiles/files/jokekiwotimos.pdfIn PDF document text
- http://kuppersbusch.hu/userfiles/files/kebevoguziwabudusimijaku.pdfIn PDF document text
- http://kaus21.com/userData/board/file/51323481420.pdfIn PDF document text
- http://27derajat.com/assets/ckfinder/core/connector/php/uploads/files/89994158570.pdfIn PDF document text
- https://phucatgarment.com.vn/ckfinder/userfiles/files/21634833927.pdfIn PDF document text
- http://kreativitaet-stadlhofer.at/global/images/userfiles/file/86485033889.pdfIn PDF document text
- https://citronixdeflection.com/nbloom/fckuploads/file/91051997392.pdfIn PDF document text
- https://il-gusto.com/images/file/vaxewidupafijujisaxadod.pdfIn PDF document text
- https://on-call-anatomist.org/ckfinder/userfiles/files/72021751122.pdfIn PDF document text
- http://koppeika.ru/userfiles/file/6988976650.pdfIn PDF document text
- http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f2471c2f8---857536650.pdfIn PDF document text
- http://bakineshr.az/ckfinder/userfiles/files/pebujivapepifopidojeju.pdfIn PDF document text
- http://www.sanjuktabanerjee.com/fckimages/file/fofimoz.pdfIn PDF document text
- http://baozhaopharma.com/upload/files/83076737805.pdfIn PDF document text
- http://sualpturizm.com/userfiles/file/19580172536.pdfIn PDF document text
- http://maility.pl/_ADRESuserfiles/file/3924919778.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613953053485d---rovaxavetedisubenutidib.pdfIn PDF document text
- https://barrier.exma.cl/ckfinder/userfiles/files/tewuroxuguletagotop.pdfIn PDF document text
- https://sunsetlearningcenter.com/userfiles/file/fedif.pdfIn PDF document text
- http://dijladentalcenter-qa.com/userfiles/file/forix.pdfIn PDF document text
- http://lg-palette.com/upload/files/20006708666.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=usb+stick+android+formatierenPDF 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_off0000d845.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD845	17452 bytes
SHA-256: `8908030bac82da650ae66a3818105da2273da89f6cc31266e2ce8d4d12926efd`
`font_01_sfnt_off0001055e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1055E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011d75.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11D75	10828 bytes
SHA-256: `dede87a9ffc2cb53295b9f7c0a62c5510e55ad8270155c098b48ed18d0c2259e`

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