PDF malware analysis — malicious · d986272774f35c78

MALICIOUS

PDF

79.1 KB Created: 2021-09-12 12:58:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 155d48c0e3f3aa95c49278b730102d47 SHA-1: 6ca2a6ce1724cf60d099c584ba8ac0a009f6b4e8 SHA-256: d986272774f35c78bf4ef0ff49a971dd6f9b90ab19e3bbf99bbf859b5c880709

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, with many distinct URLs hosted on disposable domains, suggesting an attempt to direct users to malicious content. The presence of compromised CMS upload links further supports a malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9940

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://ydchem.cn/filespath/files/20210902181000.pdf In PDF document text
- http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136775ed8e12---51888310975.pdfIn PDF document text
- http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/18325628404.pdfIn PDF document text
- http://gowowdeli.com/uploads/files/powapigogafutarukawedibaz.pdfIn PDF document text
- https://dukeofmarshall.com/ckfinder/userfiles/files/25955585222.pdfIn PDF document text
- http://dallapietamarchisio.it/userfiles/files/difeburesino.pdfIn PDF document text
- https://aramlasmerok.hu/uploads/file/nuvepibuvukosudo.pdfIn PDF document text
- http://indexone.ru/upload/file/57173375380.pdfIn PDF document text
- http://sicompk.com/survey/userfiles/files/62588049980.pdfIn PDF document text
- https://delphin-restaurant.com/ckfinder/upload/files/8636253986.pdfIn PDF document text
- https://rainbowfurnitures.com/files/files/12453118216.pdfIn PDF document text
- http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135cfacabbd5---kobule.pdfIn PDF document text
- https://eltechma.com/zdjecia/fck/file/53068163492.pdfIn PDF document text
- http://polishingmarblefloor.it/userfiles/files/95068560912.pdfIn PDF document text
- https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/9d16ade2bcbdbda852425424fb26e39a/82539652189.pdfIn PDF document text
- http://hanyangsteel.com/files/fckeditor/file/700143974612f3c5e38dac.pdfIn PDF document text
- http://donovaly-ubytovanie-safran.sk/web/userfiles/file/pogukolexuwolajemufipumi.pdfIn PDF document text
- https://clickbox.ro/images/file/16022405891.pdfIn PDF document text
- http://hysansam.com/fckeditor/userfiles/image/xeloxejemezorigupajumogu.pdfIn PDF document text
- https://hongmao.tw/uploads/files/202109060648535672.pdfIn PDF document text
- http://euskararenginkana.eus/files/galeria/files/68850778055.pdfIn PDF document text
- https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/ad220108dae67dce9c5c7ecf88c7a9bf/52833356430.pdfIn PDF document text
- https://alsultantrading.ae/userfiles/files/bekuvilovorojoko.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=the+new+world+order+ralph+epperson+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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000ba13.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBA13	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000d224.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD224	16632 bytes
SHA-256: `e896d0c9c6509c93731645541c0836c845742b74f7fde2e8ff5e94baacc6a6a0`
`font_02_sfnt_off0000e9b6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE9B6	10452 bytes
SHA-256: `23873042f0ab577832c930afc57811c5889ce56aabddd8150c426d956bad7780`
`font_03_sfnt_off00010169.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10169	16752 bytes
SHA-256: `fbe75ad22c2d5e1ecbd59ddf50d8b8875473e21b874db6fda59b4625f7d9b973`

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