PDF malware analysis — malicious · f5d7823bb39e7228

MALICIOUS

PDF

85.1 KB Created: 2021-09-19 13:23:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: a6bf01362d4fede87e5f9653cd760883 SHA-1: ed7af3b04e1bccc5f4735255433721af6884f9bc SHA-256: f5d7823bb39e7228e7b503d755ad656ec5788578e05158e0f257ef84b078a63c

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1614314c5aae96---8658294249.pdf In PDF document text
- http://lovesushiscv.com/uploads/files/45254423743.pdfIn PDF document text
- http://ozdesignhouse.com/app/webroot/uploads/files/bupapojalo.pdfIn PDF document text
- https://mimpishio1.com/contents/files/59984561645.pdfIn PDF document text
- http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/49410909673.pdfIn PDF document text
- https://adikmanis.com/contents/files/fuluzigeno.pdfIn PDF document text
- http://www.ciesol.com/ckfinder/userfiles/files/24695904130.pdfIn PDF document text
- http://mikomisushiwc.com/uploads/files/dalupuvutuzasonon.pdfIn PDF document text
- http://cyc.cz/pictures/clanky/files/kufomejijekajejo.pdfIn PDF document text
- https://kalashad.com/userfiles/file/80588452713.pdfIn PDF document text
- https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/0c1db651bcc643be50a0c314224ab15d/89958621065.pdfIn PDF document text
- https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4339b8059---94488051603.pdfIn PDF document text
- http://naso10.com/userData/board/file/xexowukiropugonuroza.pdfIn PDF document text
- http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc7459f63c---kederuri.pdfIn PDF document text
- https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebaa313f1e---13559914853.pdfIn PDF document text
- http://www.serenissimaservizi.com/files/86682520413.pdfIn PDF document text
- https://gea99.com/ckfinder/userfiles/files/30269593545.pdfIn PDF document text
- http://kbinteriery.cz/userfiles/file/58118478872.pdfIn PDF document text
- http://posicert.com/upload_fck/file/2021-9-12/20210912064750361529.pdfIn PDF document text
- http://damosushipleasanthill.com/uploads/files/loxifebegepedufamewidir.pdfIn PDF document text
- https://matrainagycsalados.hu/userfiles/file/xutur.pdfIn PDF document text
- https://avukat.dnsaktif.net/upload/files/vegopasojujadipo.pdfIn PDF document text
- http://topenglish.sk/app/webroot/gallery/files/61350401827.pdfIn PDF document text
- http://verzorgingsindex.nl/images/uploads/dizavigupofosumamaziluvi.pdfIn PDF document text
- http://www.accl-calibration.com/login/ckfinder/userfiles/files/nogonatojidejuvogomixe.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=hola+video+call+apkPDF 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_off0000eb82.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEB82	10184 bytes
SHA-256: `30d285388b889d28fcaf5c596561a19eb7741c6fea0527e058819c5c4804f159`
`font_01_sfnt_off0001025c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1025C	17192 bytes
SHA-256: `08d4efa06b2d70358c5f2783d1e980acacab65b17ae33e65606c8a95dcb4a134`
`font_02_sfnt_off00012e8e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12E8E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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