PDF malware analysis — malicious · d87b3b1b1944c165

MALICIOUS

PDF

100.7 KB Created: 2021-07-20 08:37:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: afaaefc8773d1091799bc94b6edd53c8 SHA-1: 619db486449b94eb8cdea9a7718dbe1c02395ad9 SHA-256: d87b3b1b1944c1652b6ee11a4a92d18bd10fbb09dc4312abb4a306054fedd43e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were extracted, the structure and embedded URLs point towards a malicious document designed to lure users to external sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9708

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 http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a5031eabd4c---bedonawuzavukezub.pdf In PDF document text
- https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5424037ce---31586333671.pdfIn PDF document text
- https://benqmusicworkshop.com/fupload/file/neroneketexof.pdfIn PDF document text
- http://staples1981.com/clients/b/ba/ba027a536d51c1d997ee76cae6dc9017/File/9272212555.pdfIn PDF document text
- https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/55fe6086b68f8c17e95fd873bfb3515a/86661084483.pdfIn PDF document text
- http://cementfeet.com/userfiles/file/8661981759.pdfIn PDF document text
- https://scavilecis.it/userfiles/file/pavadejuluzaboxabaz.pdfIn PDF document text
- http://ambvetsanprospero.eu/userfiles/files/61266153622.pdfIn PDF document text
- http://stark-tools.ru/images/uploaded/lizexekidamigudi.pdfIn PDF document text
- http://murielbellhomes.com/userfiles/files/34622400920.pdfIn PDF document text
- http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/50aacded63174c84719ff9392d3be282/bobegidipu.pdfIn PDF document text
- http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16086d7ff435ae---27917897911.pdfIn PDF document text
- http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/sip2l2vfblujplqu6nco7ip21v/jenepazejozajamori.pdfIn PDF document text
- http://webbuilders.com/files/file/nulodebavunalezovatet.pdfIn PDF document text
- https://stef-nancy.fr/upload/document/lagugujowaweferutisu.pdfIn PDF document text
- http://debschoen.com/userfiles/file/zekanuzevibolekuwo.pdfIn PDF document text
- https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3732d5f614---nivuzibepazudasagelu.pdfIn PDF document text
- https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/0afe1c1dm6kn2c27v57lkf8mti/73644613068.pdfIn PDF document text
- https://nffcd.org/userfiles/files/xuwuto.pdfIn PDF document text
- http://biotledlight.com/userfiles/file///79256739838.pdfIn PDF document text
- https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d6bf714f41f---dovusax.pdfIn PDF document text
- https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/a7d0d4f670f86186b2fba7c6c4ab2e29/wuzekubof.pdfIn PDF document text
- http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/16218669782.pdfIn PDF document text
- https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/97d8b432d2ef7d53251bb3c8d1dbc552/94264240573.pdfIn PDF document text
- http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/46b7c981f7417ccd2a56a5c68b92842a/91608223082.pdfIn PDF document text
- http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca0f33c2ac---66665858825.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=model+activity+task+class+6+english+part+2+answerPDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00010b1a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10B1A	17888 bytes
SHA-256: `c36fd5c5ab069d2442e55f5765b81b51507ad59d375e1ff2702d19860c69f051`
`font_01_sfnt_off00013a45.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13A45	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00015256.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15256	16140 bytes
SHA-256: `00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b`
`font_03_sfnt_off000167d3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x167D3	11432 bytes
SHA-256: `3308fecd201558a78456fc6c69c77a08c62d5851246ab48ff133e245244d0878`

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