PDF malware analysis — malicious · 17fd336277a620a4

MALICIOUS

PDF

81.1 KB Created: 2021-09-11 02:19:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: 2e1b33e185683597e601407d7e1c4e71 SHA-1: d422413439a51e2e84bde716ff4218cdca3d9211 SHA-256: 17fd336277a620a45891176ef703992051d8c584ccab9f652f552fb348d32afc

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. It contains a link farm with numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely serving as a redirector for phishing or malware delivery. The presence of external URIs and link farm structures strongly suggests a spearphishing attachment attack vector.

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 https://nomylo.ru/uplcv?utm_term=onenote+app+android PDF link annotation
- http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613771d660c64---12529053674.pdfIn PDF document text
- http://premo.at/userfiles/file/buvuruxe.pdfIn PDF document text
- http://salsainkonstanz.de/media/files/94977369437.pdfIn PDF document text
- http://ipceurope.eu/assets/file/67556486290.pdfIn PDF document text
- http://portaldeaquidauana.com.br/ckfinder/userfiles/files/45327613425.pdfIn PDF document text
- https://jmtours.co/aym_image/files/tazekifar.pdfIn PDF document text
- http://1-sanya.com/blog_images/blog_/file/80806032938.pdfIn PDF document text
- https://atputasbazes.lv/images/userfiles/files/49628310793.pdfIn PDF document text
- http://grandviewcommunity.com/userimages/wipaveporimirabopiwopu.pdfIn PDF document text
- http://doctour.hu/uploads/ckfinder/userfiles/files/xulufapafibufebisox.pdfIn PDF document text
- https://uclerbaklava.com/resources/file/1753293697.pdfIn PDF document text
- http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/65929445531.pdfIn PDF document text
- http://bettynblue.com/upload/fck_img/20210902/file/70535037918.pdfIn PDF document text
- https://greenboo.vn/uploads/files/wawiwiritikuligavujatafu.pdfIn PDF document text
- https://ww150007.linebot.net/upfile/files/20210901233521.pdfIn PDF document text
- http://asesoriazabalburu.org/azaba/files/file/dinenorafopitikumumulel.pdfIn PDF document text
- https://md-bud.pl/szklo/photos/file/lisaganawiwijupewakozabep.pdfIn PDF document text
- http://fiumevivo.it/userfiles/files/tulolebebezap.pdfIn PDF document text
- https://tranhdaquyhn.com/uploads/news_file/lerafidokafexuxizimola.pdfIn PDF document text
- https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161365bbba1f3f---kurevorabeweka.pdfIn PDF document text
- http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b8f0ab5c8---zivitozif.pdfIn PDF document text
- https://fpcofmacon.com/nbloom/fckuploads/file/51980104552.pdfIn PDF document text
- http://www.naturhalles.fr/fckeditor/userfiles/file/54363738294.pdfIn PDF document text
- http://thingsantiquesla.com/userfiles/files/xawalijipananufut.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_off0000dbdc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDBDC	16976 bytes
SHA-256: `4f8cd6c437efb0080907aeb2a540d64d776ead6842707b7b56de622d4aa678e6`
`font_01_sfnt_off000107ad.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x107AD	10196 bytes
SHA-256: `4e58f7ecdc3f28b332b605efd9a0bc8d550e2911ebb11cc713b862d7b76a8c30`
`font_02_sfnt_off00011e9c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11E9C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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