PDF malware analysis — malicious · 94df30fd69d81559

MALICIOUS

PDF

82.9 KB Created: 2021-09-04 01:15:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 0e76edc656dd315c2c9a80dabd967df9 SHA-1: 376c9725e694bb9dea7ae081dfa7dac2a676bfaf SHA-256: 94df30fd69d815596d93a6355c5c22a7b46553187e8dae23ecd0ac448a4365ce

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, pointing to numerous URLs hosted on potentially compromised CMS uploads, suggesting a phishing or malware distribution scheme. The presence of external URIs and a link farm on disposable hosting further supports this assessment.

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 https://soalmatematik.com/userfiles/file/18578531717.pdf In PDF document text
- https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/11206814dd9ee859bed1d7d914569702/55233216671.pdfIn PDF document text
- https://chetanaus.org/bheru/uploadfiles/file/9712424614.pdfIn PDF document text
- https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddd1a2d7365---vibivulifogovamok.pdfIn PDF document text
- https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160747c89c9d1b---4795997080.pdfIn PDF document text
- https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/46e1sd9b1b423juc0k5kmdof14/79526815965.pdfIn PDF document text
- https://efficimm.fr/userfiles/files/88291146774.pdfIn PDF document text
- https://sportnazona.bg/f/uploads/files/49104578365.pdfIn PDF document text
- http://backupcenters.com/userfiles/file/fetirekovorif.pdfIn PDF document text
- http://henghuitong.com/jingkelun/userfiles/files/20210731142141.pdfIn PDF document text
- http://guanzhuli.com/userfiles/file/popemuvalosewagomuzav.pdfIn PDF document text
- http://sns.hu/_user/file/muwabevix.pdfIn PDF document text
- http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/nmgjubnne52o1qonvhuoktiui3/33695480207.pdfIn PDF document text
- http://vinhhangvien.com/upload/files/75996279033.pdfIn PDF document text
- http://ylplj.com/ckfinder/userfiles/files/21813918532.pdfIn PDF document text
- https://ixiu-23.com/uploads//files/202108092301245963.pdfIn PDF document text
- http://archerelectricsupply.com/userfiles/file/85637131937.pdfIn PDF document text
- https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/7n3ihe9j9jl5888f6nj10nto2r/kukodazebodegam.pdfIn PDF document text
- http://ajarnveerapong.com/UserFiles/file/74666687484.pdfIn PDF document text
- https://thinkglobalcompliance.com/ckfinder/userfiles/files/nasumomapibegosot.pdfIn PDF document text
- https://codecs.roimages/file/jumiti.pdfIn PDF document text
- http://tjsijiqing.com/ckfinder/userfiles/files/2021/0611/08f67663d19a6514c49a01fb630ff444.pdfIn PDF document text
- http://wedding-box100.com/uploads/files/202108291322292527.pdfIn PDF document text
- http://codienlanhminhquang.com/upload/files/23003700841.pdfIn PDF document text
- http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080b91946372---newazam.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=modern+physical+metallurgy+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_off0000daa2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDAA2	11272 bytes
SHA-256: `5fc59909da738b84241602c9ca221ab38ca465765cc324e217833bd913ca5835`
`font_01_sfnt_off0000f4b1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF4B1	19316 bytes
SHA-256: `467e938c7070fc15a2be028cea49908d300253c0d150558fd6a7417d83b9571e`
`font_02_sfnt_off000125bf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x125BF	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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