PDF malware analysis — malicious · a13b422d3dc158b1

MALICIOUS

PDF

92.0 KB Created: 2021-07-08 10:11:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 52e9769ee7f29e55962369b69d59f90a SHA-1: 9757bc2cb773e1fdf477a85630751560ed22bfc1 SHA-256: a13b422d3dc158b14b41b1de70f78a701c747ee12700cd9f8a64f49a200b0cb5

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It contains numerous external URIs and links to compromised WordPress upload storage, suggesting it's part of a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9822

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://queure.ru/uplcv?utm_term=example+of+notice+to+move+out PDF link annotation
- https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/6a04771955f40e702e1e070621647d64/76999776088.pdfIn PDF document text
- http://soflocops.com/clients/67403/File/56402609609.pdfIn PDF document text
- https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/f1e4079b9cb4ee3ea92049e23c91f516/novivaseninofegup.pdfIn PDF document text
- http://ovodatar.hu/userfiles/file/21836259029.pdfIn PDF document text
- http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089298c6ff70---latazuxulijefuzixunobad.pdfIn PDF document text
- https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/3fa311909376e50759a3ed580551ec7f/salafede.pdfIn PDF document text
- https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/a049af8db86bdbf419d337c44c93b0d1/zodufuze.pdfIn PDF document text
- http://bscartridge.com/pic/48240826253.pdfIn PDF document text
- http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/605a32c6b05283026e252bbd143b4079/nowumesomisuma.pdfIn PDF document text
- https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/f53ef095e5cbabb38dedff294f78b853/rawunaset.pdfIn PDF document text
- http://top1np.com/ckfinder/userfiles/files/salimigolosunefaturenule.pdfIn PDF document text
- http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160abadbc07ddf---bupuboruligezipofedi.pdfIn PDF document text
- http://nail-free.com/ckfinder/userfiles/files/jumomuv.pdfIn PDF document text
- https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099ad80e9947---defazupasezosilekilagomi.pdfIn PDF document text
- https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/73381240f005af2d03839633752704ba/gopulozadezojunibego.pdfIn PDF document text
- https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/a5f15948826b73ae2438bcaf77356593/jamiwaf.pdfIn PDF document text
- https://harrisitalia.it/uploads/file/kawegadezi.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713f257b983---94260930221.pdfIn PDF document text
- http://hocikto.info/userfiles/file/10683214456.pdfIn PDF document text
- https://travelstore.tn/userfiles/file/guvigeketidubofusovapusuw.pdfIn PDF document text
- https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4f9d152c64---34082035345.pdfIn PDF document text
- https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/t958t5234etr3bffvrhsq4unhp/83047458569.pdfIn PDF document text
- https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/af5a8813a38321722a5a3a2aedce212f/jabosivomemumawugupe.pdfIn PDF document text
- http://vuatoyen.com/uploads/userfiles/file/dexipejadeli.pdfIn PDF document text
- https://stancijanegrin.com/UserFiles/files/pewobedifudorimibabasaje.pdfIn PDF document text
- http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607c91871f129---wafilizidakonujapida.pdfIn PDF document text
- http://aotwresort.net/ckfinder/userfiles/files/47938836260.pdfIn PDF document text
- http://fresh-j.info/images/uploadedimages/file/38594998278.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00010136.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10136	17952 bytes
SHA-256: `c01fede4b3584d4e39dcd51c42c6b2363ca8759bc7dbf12ab1cea6b964ca337c`
`font_01_sfnt_off0001304e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1304E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00014865.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14865	10624 bytes
SHA-256: `6db37e6e7d6ed482fc0f730d75789bb64ff9c2509e82735f8a93f80a43fd16ee`

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