PDF malware analysis — malicious · 0ea68f5a5c5c7e35

MALICIOUS

PDF

80.9 KB Created: 2021-09-04 22:52:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: d9e10be9a5e057a58ebe20e1840b1939 SHA-1: e4d6c6df18470d6eb195ab76ac71ccf9f35a973d SHA-256: 0ea68f5a5c5c7e3510662f641988bc373e4c88f8c1f078816ab45bf645f032c3

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The document contains numerous links to external PDFs hosted on various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of these links and the detection signatures point towards an attempt to redirect users to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9846

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://gostinica-domodedovo.ru/files/metototivopemu.pdf In PDF document text
- https://akapacha.com/userfiles/file/80279827637.pdfIn PDF document text
- https://ckmusicdesign.nluserfiles/file/15715351549.pdfIn PDF document text
- https://ilexgold.com/app/webroot/files/userfiles/files/ritesisix.pdfIn PDF document text
- http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/vckphn82k5o4f0cv1442d9qo03/61112938104.pdfIn PDF document text
- http://globalcenterhotels.com/bot/ckfinder/uf/files/89983212917.pdfIn PDF document text
- https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/3c419f0436290a8d35c44cfdc357710a/rovabavofenutu.pdfIn PDF document text
- https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/360ae84286be283bd524bde7ce2f9405/fupijotogaderemodikomud.pdfIn PDF document text
- https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/rabafakurokoganepelug.pdfIn PDF document text
- http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/liputadalorek.pdfIn PDF document text
- https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/i297j262jt7pp6on38bj94l293/zotujasupexixa.pdfIn PDF document text
- http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c076b4b96b3---96683971089.pdfIn PDF document text
- http://ebiocell.com/uploadfile/file///2021081714503334.pdfIn PDF document text
- http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/matofozomavo.pdfIn PDF document text
- https://snqrsl.quebec/upload/editor/file/xofejobufiwutux.pdfIn PDF document text
- http://davidlbrooks.com/clients/868292/File/jisepumutixamuzigegapono.pdfIn PDF document text
- https://nhakhoaanphuoc.vn/uploads/files/birozoropanadajigunorogu.pdfIn PDF document text
- http://bbu.vn/Images_upload/files/49292262335.pdfIn PDF document text
- http://coquicart.com/ckeditor/ckfinder/core/connector/php/uploads/files/43934897827.pdfIn PDF document text
- https://sport-jicin.cz/dokumenty/42093155839.pdfIn PDF document text
- https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/c7336bc952fd175b1d7ca99d77582ea7/lagoziniseximaxamowuve.pdfIn PDF document text
- http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e97c18a0e---53133279005.pdfIn PDF document text
- https://tavio.ru/files/file/lifulenidatovuwiroxikum.pdfIn PDF document text
- http://goodfortune.hk/UpLoadFile/file///wivowolatojagurinomab.pdfIn PDF document text
- http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160978d1b142a8---lugesededivilarapab.pdfIn PDF document text
- https://acryl-bg.com/userfiles/file/65207605804.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=vertigo+postural+paroxistico+benigno+pdfPDF 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_off0000d75c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD75C	11108 bytes
SHA-256: `c2640f1f517483da6a3f29c97b1c1c512590d5ffdf872a05fe243c703cac64f5`
`font_01_sfnt_off0000f0fe.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF0FE	16876 bytes
SHA-256: `b60736d521ccfd5ed994ded8754c5e81bdc5c1a1a5c1390ed09a61a984becca0`
`font_02_sfnt_off00011c2f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11C2F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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