PDF malware analysis — malicious · b1ca938f84695ac8

MALICIOUS

PDF

78.0 KB Created: 2021-09-03 09:34:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: f024e127a4e0d3631369c5df1161f9b1 SHA-1: 31db3c033d63df5cf1cf6057d013eb95cbc945a3 SHA-256: b1ca938f84695ac8e5d23aa7d51540d8d2328f36b38ae2b180e13c7924ca2b50

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links strongly suggests a phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9908

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://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16085fa85b67c2---73150435498.pdf In PDF document text
- https://psfund.org/public/uploads/files/cms_files/wikaralazamuxuxikod.pdfIn PDF document text
- http://famillespourstarlight.com/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/paxofe.pdfIn PDF document text
- https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/68927860d48807fe7324da5e1fccd915/63175917094.pdfIn PDF document text
- http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160a3ed5fbbac3---38976135138.pdfIn PDF document text
- http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16086a31102d6e---vovixebarerufejexoxa.pdfIn PDF document text
- http://www.rupankar.com/fckimages/file/57006355462.pdfIn PDF document text
- http://hebammenglueck.de/ckfinder/userfiles/files/worore.pdfIn PDF document text
- https://limpiezasinasel.com/userfiles/files/vowisukemeb.pdfIn PDF document text
- http://aroma-es.red/yamituki-n/uploads/files/fevezurovazigexaronako.pdfIn PDF document text
- https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3706d17192---48142625105.pdfIn PDF document text
- http://coinmarketsuite.com/ckfinder/userfiles/files/pekifes.pdfIn PDF document text
- http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/54pvbocni25f65v79fm5s536q5/39016910941.pdfIn PDF document text
- http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe784c58fe4---bitizisiwudoborewire.pdfIn PDF document text
- https://tselectromechanical.com/uploads/CKfiles/files/rewujejemubizedapux.pdfIn PDF document text
- http://dianacb.cz/userfiles/file/jetusobujo.pdfIn PDF document text
- http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/ut4fb52o3f4jti97kd7ohinja0/60976194868.pdfIn PDF document text
- https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce0fbb1dc1---pawamum.pdfIn PDF document text
- http://packagingandfoodmachinary.com/userfiles/file/viwovavad.pdfIn PDF document text
- https://maconlux.ovh/userfiles/files/genedilivanupuwibov.pdfIn PDF document text
- https://epgeptech.hu/ckfinder/userfiles/files/56857006060.pdfIn PDF document text
- https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/q69r87rp1fvc2hmne0d3s53n18/25882543891.pdfIn PDF document text
- https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/921d04a3ff052cd7d94f6e884052d96d/kexoramugokiwoxiwifunal.pdfIn PDF document text
- http://portaldeaquidauana.com.br/ckfinder/userfiles/files/76910254161.pdfIn PDF document text
- https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/3a6e09a1dd11739c332a6a87f224a9c2/31938026706.pdfIn PDF document text
- https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/12f09ca1ac02824b1548c8f4d2997a7e/49043589174.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=sample+of+a+cover+letter+for+job+application+pdfPDF 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_off0000cedf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCEDF	16252 bytes
SHA-256: `be433e195196ea8828593ab851eee4a6905c0746a1515fbd65cb03af9769a304`
`font_01_sfnt_off0000f830.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF830	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011047.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11047	11024 bytes
SHA-256: `51309ad98d108e55ec6366b6615b5ef4a4004bcaeacc0c3a53392e581ebe5bb1`

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