PDF malware analysis — malicious · 0903480aad8a9215

MALICIOUS

PDF

82.4 KB Created: 2021-09-20 14:11:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: ee0d8d53f6c0176904dd4f352722a346 SHA-1: ec182333c6d510c9ecb9986c6b86462a60a6a029 SHA-256: 0903480aad8a92150c554644059fe97a2dc179271a4fb53359198fc58a2acadb

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The PDF structure and embedded URLs point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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://philabc.ru/uplcv?utm_term=keeper+of+the+lost+cities+nightfall+pdf PDF link annotation
- https://raselapp.com/userfiles/file/40639278612.pdfIn PDF document text
- http://viorina-deko.com/images/file/xijepinirakor.pdfIn PDF document text
- http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16141b79062415---54634679089.pdfIn PDF document text
- http://panziofabian.hu/fck_kepek/62621361709.pdfIn PDF document text
- https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b78e5373d1---33407842981.pdfIn PDF document text
- http://tipsclubcr.com/campannas/file/satujowelutezugugiwezek.pdfIn PDF document text
- http://leoclubmarsala.it/userfiles/files/3610652758.pdfIn PDF document text
- http://studiorumeo.it/userfiles/files/nudibinegubelupaxagufuzim.pdfIn PDF document text
- http://hairfibers24.com/upload/file/vuzunarita.pdfIn PDF document text
- https://nhatngudongkinh.com/upload/ckupload/files/68453207733.pdfIn PDF document text
- https://webkapper.nl/ckfinder/userfiles/files/jimazozex.pdfIn PDF document text
- https://thegioibaobicarton.com/Images_upload/files/8581619580.pdfIn PDF document text
- https://inprovitargentina.com/ckfinder/userfiles/files/juxuma.pdfIn PDF document text
- http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zozafefilulojekaputexaroj.pdfIn PDF document text
- https://5of7edwardstreet.com/assets/media/files/80973816668.pdfIn PDF document text
- https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/6iu3mfbe9v8bub6bf5n6a8ib37/fopekuzi.pdfIn PDF document text
- https://nsck-cykelmotion.dk/userfiles/file/jebilumafarupobawaru.pdfIn PDF document text
- http://naso10.com/userData/board/file/80871038508.pdfIn PDF document text
- https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/6e8d492713fd110dc6cd4764a5189e29/12004358116.pdfIn PDF document text
- http://campbellelectronics.com/uploads/mobofasigudesotu.pdfIn PDF document text
- http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/waxikakigowemusixekigik.pdfIn PDF document text
- http://sksound.com/userfiles/file/ronizorikukemenugejide.pdfIn PDF document text
- http://ipai-bg.eu/img/file/25242716334.pdfIn PDF document text
- https://hotnews.md/upload/userfiles/files/xazigajedodemowafazitok.pdfIn PDF document text
- https://vantainoidia.vn/ci/userfiles/files/digadujazubijexumip.pdfIn PDF document text
- 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_off0000dcc2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDCC2	10892 bytes
SHA-256: `279f07f69930f0d34c05c4cc37a89e03e788eaf9a3df1798ec93830b19a4b866`
`font_01_sfnt_off0000f5b6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF5B6	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010dc8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10DC8	18360 bytes
SHA-256: `4a4de1be7f5a9e73b7041340f8faad23a5b1afddd9a00d4e98a817a6580023cc`

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