PDF malware analysis — malicious · a7936376a002c377

MALICIOUS

PDF

73.5 KB Created: 2021-06-02 13:06:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23

MD5: 34f2d738ad2430715783e5bb228decdc SHA-1: 03aa6e30930e56f27bdc9c415a83a444c0940a36 SHA-256: a7936376a002c377810a91bc722080abfec6e5ae5efb7d1b7d9f06682d08caad

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

Nyx PDF Classifier malicious score 0.9543

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
PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED

The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
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://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16079f754eb111---rafagikugebujipedugozezi.pdf In PDF document text
- https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/8e2c8311e1f3909c9dfee35ddea100a1/mozonulivasabijekevi.pdfIn PDF document text
- https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/8a9f4711f3454332aa6d4403b7554c58/93202998473.pdfIn PDF document text
- https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5f1a673f5---6856826603.pdfIn PDF document text
- https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/a2al0836mduh2l0o7vfeae36mi/fabumijoxofuruwijodix.pdfIn PDF document text
- http://eltonltd.ru/sites/default/files/uploads/fitutemudom.pdfIn PDF document text
- https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/f83fa12e6b0c710b2b8c1cfbfe7958c3/89416579992.pdfIn PDF document text
- http://sosnovgeo.ru/userfiles/file/48127966813.pdfIn PDF document text
- https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16084aeadbfe28---badorogebadakom.pdfIn PDF document text
- https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608556a7a0229---19673610337.pdfIn PDF document text
- http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/9b5ce197ef3d9cd151cfd8da8837c40c/ganixenomobexi.pdfIn PDF document text
- http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160705ea914591---faxizabokegekapux.pdfIn PDF document text
- http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609616e5ce4d3---56938958366.pdfIn PDF document text
- https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/35ebea6dbdf44ae2560b715287d2dd89/14731015197.pdfIn PDF document text
- https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/8da46d9d27723a236cd9b610a5666e6d/3203363643.pdfIn PDF document text
- http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/feritekiloladowunebele.pdfIn PDF document text
- https://boumqueur-edition.com/upload/fckeditor/file/15883130789.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://www.daltonmaag.com/In PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+make+chocolate+glaze+without+powdered+sugarPDF link annotation
- http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000dd0a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDD0A	5428 bytes
SHA-256: `ac6f4b76ca0a49f8dfd136aeda2f0bf837de9bfdeb50bb4ef209ea0cf955742b`
`font_01_sfnt_off0000ef95.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEF95	11688 bytes
SHA-256: `46baddea2cc54d181a857cd36c5d54b46e56a85a3980fbe43e8de4f765cb2472`
`font_02_sfnt_off000116c9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x116C9	4324 bytes
SHA-256: `cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34`

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