PDF malware analysis — malicious · e01e24f6481bb54a

MALICIOUS

PDF

82.3 KB Created: 2021-09-08 04:15:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 8402a674bd457666659141fe24aa73d9 SHA-1: 948343440d2f55f3dc40b3d3d6165721e318e4dd SHA-256: e01e24f6481bb54ad02276b8a95dcb4bff2a2f7f49bb188e13771fe2fc52dcf9

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous external URLs, many hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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 http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160842c6a6c421---88940928328.pdf In PDF document text
- http://jts-electrical.co.uk/ckfinder/userfiles/files/vuzuturow.pdfIn PDF document text
- http://assotechne.eu/userfiles/files/xirojawetepofukefozewog.pdfIn PDF document text
- https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/09af7cc6bf918c89366462a9d3af114c/57853907453.pdfIn PDF document text
- http://eko-uklid.com/files/file/bitiga.pdfIn PDF document text
- https://vanchuyenduongsat.vn/upload/files/tedawusof.pdfIn PDF document text
- http://icbiz.ru/userfiles/file/45159665239.pdfIn PDF document text
- https://fortworthdental.net/cmsCart/upload/file/damelinunokajabupibaz.pdfIn PDF document text
- https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/461c7cea88ad39f9894a16b17851c7ab/daxewupikadixebopamerogo.pdfIn PDF document text
- https://lukili.ch/UserFiles/files/94022290307.pdfIn PDF document text
- https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/26e94bb38ce130bbd0ea6381ffd3c9db/pojopi.pdfIn PDF document text
- http://wallacewilliamsfamilyreunion.net/clients/6/66/662ca4338cd1fa41fa93b88222973dc6/File/21168586425.pdfIn PDF document text
- http://euroear.eu/ckfinder/userfiles/files/90690570426.pdfIn PDF document text
- http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/be7f5dfdc7ccb3e515b455e0c9c609ad/desavib.pdfIn PDF document text
- http://kirilmazbardak.com/userfiles/file/pataguz.pdfIn PDF document text
- http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160961157afa84---ruxesikutakimuvufofej.pdfIn PDF document text
- http://hzjksj.com/images/upload/File/janezitemofuwiranowixa.pdfIn PDF document text
- http://quickvideo.nl/userfiles/file/5139987954.pdfIn PDF document text
- https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fef892b54a0---retupekakidoxidigulixuwel.pdfIn PDF document text
- http://czdashan.cn/uploadfile/file/2021043004091373499.pdfIn PDF document text
- http://techcessgroups.com/userfiles/file/69665285503.pdfIn PDF document text
- http://nceed.kr/pds/userfiles/files/sozavafunibi.pdfIn PDF document text
- https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1610c95d7db19d---1972353130.pdfIn PDF document text
- https://www.alapan.org/fckimages/file/64115539070.pdfIn PDF document text
- https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7c12cae4f---47191397218.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+shrink+a+pdf+to+fit+on+one+pagePDF 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_off0000da3f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDA3F	10900 bytes
SHA-256: `dab09790c144da9734c67a402fd18d87fd3c6a3fa1df0c493e8a187a220b2454`
`font_01_sfnt_off0000f341.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF341	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010b53.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10B53	18376 bytes
SHA-256: `75bf5c4b9a102085fe661b9c39dac28000f2ffaafbba9fbc2225a2ac2f536bd4`

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