PDF malware analysis — malicious · 3569536e8bfc1b42

MALICIOUS

PDF

86.7 KB Created: 2021-08-17 02:42:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 6bf3b09386fbaac63cd70f9ddcf8d90c SHA-1: c3086ca3ef5d301e8ef909c29eacbf1fbc29eed8 SHA-256: 3569536e8bfc1b42b07726a9c245a673d487bffcb618efb211b22f3cf2d41d03

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. Heuristics reveal it functions as a link farm, hosting numerous URLs on compromised CMS uploads, likely to redirect users to phishing or scam content. The presence of external URIs and link farms on disposable hosting further supports this phishing attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9990

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://chcial.ru/uplcv?utm_term=3+idiots+movie+bluray+download PDF link annotation
- https://pima-alarms.rs/slicice/file/33023145121.pdfIn PDF document text
- http://bakkervoorwinde.nl/app/webroot/files/ckeditor_files/files/taxujaxi.pdfIn PDF document text
- http://testplanet.nl/uploads/files/40451221001.pdfIn PDF document text
- http://perfect-gallery.com/userfiles/file/jufusej.pdfIn PDF document text
- http://emotionpicturesfestival.gr/userfiles/file/93814458411.pdfIn PDF document text
- https://okna-kursk.ru/page_edit/_samples/userfiles/files/68426121830.pdfIn PDF document text
- http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160966f2cc1812---bewatunagekajigofe.pdfIn PDF document text
- http://woodlander.sk/grafika/file/43669228455.pdfIn PDF document text
- http://asfalon.com/__files/file/pedopewimiroxataku.pdfIn PDF document text
- http://net-marketing.hu/images/files/watazekivuxuxarin.pdfIn PDF document text
- http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/66c17c4bdbd685cb6aa2219f9fc51696/xuvoraliwufogajate.pdfIn PDF document text
- http://surausa.com/uploads/files/zugales.pdfIn PDF document text
- https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/jt9g6qbvc8hhcmcslsfqub9816/43368399480.pdfIn PDF document text
- https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/7b68ab42f0ddd5528a1d15b2bb026457/jizoxamex.pdfIn PDF document text
- http://davidhammerstein.org/userfiles/file/josibexefux.pdfIn PDF document text
- http://forter.vn/hinhanh/file/464291569.pdfIn PDF document text
- http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6b284ec32---vivixeximug.pdfIn PDF document text
- https://akproauto.net/nbloom/fckuploads/file/biroguzozigupad.pdfIn PDF document text
- https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/1e7719ed552b2925d39093b55fd2f8d3/32591056486.pdfIn PDF document text
- https://irrisyst.eu/files/file/vifozebo.pdfIn PDF document text
- https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/6c11eec952bcbd1de2cbe30bbc81dd66/38358895043.pdfIn PDF document text
- https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c7ab5b44bae---jorexilav.pdfIn PDF document text
- https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/30007ccec486c26b69168d9e3ce97f9d/5453046292.pdfIn PDF document text
- http://studioingegneramato.com/userfiles/files/zuletapixijalu.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_off0000eefa.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEEFA	16884 bytes
SHA-256: `40ed6493d1c894707414ec956a16c22cf814075d0e024ad59ced32b737de8427`
`font_01_sfnt_off00011b0e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11B0E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00013325.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13325	10988 bytes
SHA-256: `394a9a360346e3647740adf857896995f8bcd904b41aad16957aa715f30c4b38`

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