PDF malware analysis — malicious · da33c00f2d7c1626

MALICIOUS

PDF

89.5 KB Created: 2021-09-01 14:56:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: c92aeda8c56ba3dedeaca7a4c2cde7a8 SHA-1: 9508c85069d304f740f0e66ae1a5c8517f781d16 SHA-256: da33c00f2d7c1626ef63522027285e36fdbe8a72c728bb6e7590d49fb5cf1e11

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to potentially compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded links are indicative of a phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

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
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://kalikraft.com/images/file/kurujega.pdf In PDF document text
- https://nhahangthanghuong.com/uploads/files/32940846953.pdfIn PDF document text
- http://tokyoto.pl/UserFiles/file/47439206754.pdfIn PDF document text
- https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088d10b85ea8---zalutojunazaw.pdfIn PDF document text
- http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36412326325.pdfIn PDF document text
- https://mimpishio2bet.net/contents//files/razezuzatanodaguso.pdfIn PDF document text
- http://www.aportecnica.com/imagenes/editor/file/pabitixusegonerunu.pdfIn PDF document text
- http://www.dereformasenalicante.com/archivos/files/18287560348.pdfIn PDF document text
- http://ecole.ru/text/images/file/gonagebizude.pdfIn PDF document text
- https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/9862eec317a7c36222f404bdf540795b/37275723695.pdfIn PDF document text
- https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/7e69e6297f993ae61926922f74372d02/39855118525.pdfIn PDF document text
- http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160bb43bf68ec8---8095170814.pdfIn PDF document text
- https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/ad74febde09cfeffcf08345dbc10d8b1/37193216661.pdfIn PDF document text
- http://greece-ex.com/lokogafovewivagazi.pdfIn PDF document text
- https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/4tff1dma1if61pafdv2ni9kl3e/97167323862.pdfIn PDF document text
- https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/24utkc1unbdcu33502n0j0bjk0/27203624391.pdfIn PDF document text
- https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/puroifsh5f7889kpianagpcrdi/mapagarixosisuxukaju.pdfIn PDF document text
- http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161060364d6ebd---71261229801.pdfIn PDF document text
- https://tktravelkorea.com/FileData/ckfinder/files/20210821_940D89C11AE6598A.pdfIn PDF document text
- http://rungruangsteel.com/public/upload/userfiles/files/37592151061.pdfIn PDF document text
- http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a56a558c4---zekarezilexenibuk.pdfIn PDF document text
- https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f229c3450---48149130000.pdfIn PDF document text
- http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a355cb6d405---13467375634.pdfIn PDF document text
- http://siciny.eu/userfiles/file/55439628376.pdfIn PDF document text
- https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/nofevuturag.pdfIn PDF document text
- https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/b1835ed9557a34de97e735a5b6e262f8/jiborevurogugure.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=cadette+first+aid+badgePDF 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_off0000f9c1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF9C1	10428 bytes
SHA-256: `545681449c5fac0fb1b0fdbfe1314879b5da5ee178a171205edcd2308461d4ea`
`font_01_sfnt_off00011153.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11153	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012965.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12965	18424 bytes
SHA-256: `5a70bd298290425f8ce061cffb311f1e4c56f0d333cf9d9092565e1edc4a4482`

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