PDF malware analysis — malicious · 1d19d9ac81e76522

MALICIOUS

PDF

90.6 KB Created: 2021-07-20 12:05:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 05cf5d814a4df3635debfe7c0e4a867a SHA-1: 0f280df80666993e91099e746a84809bbcc72b0f SHA-256: 1d19d9ac81e7652264ba2a34fb565f5512affbc6f6189cac9a3d6a2a610fb7f6

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute further malicious content or conduct phishing. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a deliberate attempt to obscure the true destination of these links.

Machine Learning

Nyx PDF Classifier malicious score 0.9820

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://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1608da66deaa4b---67695182987.pdf In PDF document text
- http://casaatlantida.com/userfiles/file///28671755025.pdfIn PDF document text
- http://hevolta.com/upload/file/bumoguxiturowogibava.pdfIn PDF document text
- http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/sn952a7ou5l3b41lfaulg6ga10/pegakutikaj.pdfIn PDF document text
- http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd07e62aa58---8719584797.pdfIn PDF document text
- http://pwr-tech.ru/userfiles/file/foledasulivodozobejudo.pdfIn PDF document text
- http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3a1a438fe---77028054437.pdfIn PDF document text
- https://rpdev.org/ckfinder/userfiles/files/40536185630.pdfIn PDF document text
- http://makingtheturngolf.com/clients/9/92/925d9bae4ecf380f28dbe0e1390c16eb/File/fejuxogurife.pdfIn PDF document text
- https://samsungklimalar.com/upload/ckfinder/files/23811527152.pdfIn PDF document text
- http://demkapi.com/resimler/files/97979261948.pdfIn PDF document text
- https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/c39c79b9e60e5729ce034efcbfabaca3/riduxaxeforoxigoxiberix.pdfIn PDF document text
- https://viettrungson.com/media//Files/zabuxemikigijowubufoje.pdfIn PDF document text
- http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/824bg7sn0f9nicmkev86sforo4/87713497320.pdfIn PDF document text
- http://cngwalk.com/fckeditor/userfiles/image/xozajolugaliwi.pdfIn PDF document text
- https://alusol-kw.com/ckfinder/userfiles/files/diletapisogiw.pdfIn PDF document text
- http://farmaciafici.com/userfiles/files/8614697313.pdfIn PDF document text
- http://thunderstar.cn/userfiles/file/20210508050233144558687.pdfIn PDF document text
- http://rajskiewakacje.pl/userfiles/file/61273558326.pdfIn PDF document text
- https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/5792b06e67f05af4b8f2f51e505e4f07/19849692807.pdfIn PDF document text
- https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/12aecfd688f646157c9d8b9ce88fa47a/nowedeniredigo.pdfIn PDF document text
- http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607607bb39729---37926790060.pdfIn PDF document text
- https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/6366ipesb9l93ehbq0hjisa43r/papawisosivuvevekelu.pdfIn PDF document text
- https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/afr9vimf8bb7m9hd013fo0kegf/72648338603.pdfIn PDF document text
- https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/948b3705c4829edfddff6944704832be/19678053867.pdfIn PDF document text
- https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba37c38ffc---woferizixexudep.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=alfred+security+appPDF 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_off0000ff57.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFF57	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0001176e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1176E	10584 bytes
SHA-256: `6b18f2c36630ca7c73a854f9ac5942231c547814064c48d3c494cf531d66dfd0`
`font_02_sfnt_off00012fc0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12FC0	17336 bytes
SHA-256: `2a41dc47e175088b03de29c28d00d348eb6335ab1c59186228af1215a22f5a5c`

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