PDF malware analysis — malicious · b53493b265722a84

MALICIOUS

PDF

74.9 KB Created: 2021-09-25 22:37:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25

MD5: 5250f84ba2ead1cee0a591327ca01656 SHA-1: 9d290a8e26869d6e841c7a49f1b8c78d197f96c6 SHA-256: b53493b265722a8450dcbc7d05903704c6151e878e677045fb7af4ab4a535c3d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, forming a link farm. These links likely serve to redirect users to phishing sites or download further malicious content, aligning with the typical behavior of a phishing campaign delivered via a malicious attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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://inwebjor.ru/uplcv?utm_term=galaxy+j7+prime+custom+rom PDF link annotation
- http://woori-tour.kr/FileData/ckfinder/files/20210911_51C9D9A249A4119F.pdfIn PDF document text
- https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/161463634e3fd7---66607398133.pdfIn PDF document text
- http://densayhongngoai.com/uploads/userfiles/file/tajulabinozuja.pdfIn PDF document text
- http://sperrincaravans.com/images/file/pumudaxoredukotidi.pdfIn PDF document text
- http://abwingssuffolk2.com/uploads/files/lozunapidokuk.pdfIn PDF document text
- http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc3ea213aa---mufenako.pdfIn PDF document text
- http://balone.net/_upload/file///1353805767.pdfIn PDF document text
- http://bjdfszwy.com/filespath/files/20210901152000.pdfIn PDF document text
- http://bukvoznaika.ru/ckfinder/userfiles/files/zupetufa.pdfIn PDF document text
- http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/161315c72d0cc6---2612193098.pdfIn PDF document text
- http://oticonshop.com/ckfinder/userfiles/files/23636568665.pdfIn PDF document text
- https://easresidence.ro/app/webroot/files/userfiles/files/3098493301.pdfIn PDF document text
- https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161474809f3438---zopiwelozanob.pdfIn PDF document text
- http://sushigonewildtogo.com/uploads/files/jepenitekuforumib.pdfIn PDF document text
- http://aihyang.com/userfiles/file/dudonodulosegirasize.pdfIn PDF document text
- http://winso.tw/userfiles/file/77149545177.pdfIn PDF document text
- http://holland-ex.com/images/blog/file/refivikiz.pdfIn PDF document text
- http://whitedwarf.ru/public/images/ckfinder/files/dedaxakufuwofarogi.pdfIn PDF document text
- http://namlinhchivietnam.net/userfiles/image/file/32422724804.pdfIn PDF document text
- http://brandorbit.in/userfiles/file/texuzovanarojoxifa.pdfIn PDF document text
- http://irollee.com/userfiles/file/66064088250.pdfIn PDF document text
- http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614d5ffa80765---kevemobiju.pdfIn PDF document text
- http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613476e70f9d1---18711335778.pdfIn PDF document text
- https://www.amata.org.uk/ckfinder/userfiles/files/zumiwivonurejaguxez.pdfIn PDF document text
- http://merrygoldholidays.com/ckfinder/userfiles/files/xogaxakogedizewixoledolu.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_off0000b996.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB996	10964 bytes
SHA-256: `a31ccd949bde55e09aa5e4f50ef3b78437304cd5e8928e7e7bd535dcb615c01a`
`font_01_sfnt_off0000d32f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD32F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000eb41.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEB41	19448 bytes
SHA-256: `3b50b2c0f049873e73fae669e048abeae64d6f1334bef861ce31cec4e3b713f8`

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