PDF malware analysis — malicious · 604ad4d8c5cccc84

MALICIOUS

PDF

79.7 KB Created: 2021-08-01 17:43:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: b40aec3df6ea5aaa0c7ead4cff8ca50c SHA-1: 084023e1aa475e4ba37aedaac8abd24680221448 SHA-256: 604ad4d8c5cccc84563a914da3fefcb923dee68260bb9e8bb58fb058c13dcc69

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9846

Heuristics 7

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.
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
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://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608504f7ba80f---18851635270.pdf In PDF document text
- http://shannonlakeestates.org/fck_images/file/3036957410.pdfIn PDF document text
- https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/d29044f25f0f4c9f7d760554ba9c58ec/kozogexuxelurabexulajul.pdfIn PDF document text
- http://angkagenap.com/contents//files/joradu.pdfIn PDF document text
- https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/pakigetigejugusu.pdfIn PDF document text
- http://newo.ru/files/files/sexofodunopebelagi.pdfIn PDF document text
- https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/6767c3e3ed194f0b0dc27c13b537b75a/13448694015.pdfIn PDF document text
- https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/1a4c3a0a143b058f7486edfbd3635543/botesagafogatela.pdfIn PDF document text
- http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16077a1bb16353---50015940553.pdfIn PDF document text
- http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8a1616148---64562934742.pdfIn PDF document text
- http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/4sc2ugq95sgh0jqmbojf2geas6/59507785283.pdfIn PDF document text
- http://odessahighschool1970.com/clients/7/70/70263b1be1b93b62200e198143f59f20/File/8245595093.pdfIn PDF document text
- http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/c7e7398b22dfc4f797ebacb0eddf2d74/76725173009.pdfIn PDF document text
- https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/299dd7953145dc450af9b09e2aeef1d9/31468961974.pdfIn PDF document text
- https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/c2c9c4fb20d6e5edcca1d9384a7f655c/95776282753.pdfIn PDF document text
- http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607035b76abec---93661548240.pdfIn PDF document text
- https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/re04paip9da4anlrgegaihua7m/jevopajulu.pdfIn PDF document text
- http://asea-admin.com/_userfiles/file/20210517175439.pdfIn PDF document text
- http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4f05ecc48---mavipupigorigowoli.pdfIn PDF document text
- https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/66d0fa6b89cad0d8839ab10e13f3247f/27580846373.pdfIn PDF document text
- http://www.physedu.in/newsite/userfiles/files/nirizol.pdfIn PDF document text
- https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098c569e45ce---nizapexa.pdfIn PDF document text
- http://anipetkingdom.com/webroot/img/files/nemawapiz.pdfIn PDF document text
- https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/89f8f52c134721b68b42c3a463ea1860/dumedimupaparoruremuzom.pdfIn PDF document text
- https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/1416ee04d1ff72155006acd6ff602b6f/sixapagazivewesiwexido.pdfIn PDF document text
- https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/4ugmvfpi7h2ei7t60iobku5h9r/5448350310.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=headway+elementary+workbook+pdf+free+downloadPDF 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_off0000cf23.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCF23	19464 bytes
SHA-256: `4ea0a8daaa9d1252c816db0dcd4112d9971b8b63e871082a645aa09ce30a11de`
`font_01_sfnt_off0001004d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1004D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011864.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11864	10824 bytes
SHA-256: `1cf5d283ef26c8716cd624f4046e99a4d224ca9983234d4b74c99d21a2cc5db3`

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