Malicious PDF — malware analysis report

Static analysis result for SHA-256 867cbceed7f79a68…

MALICIOUS

PDF

83.9 KB Created: 2021-09-08 19:55:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ca505193fb0383dec2935647ade7f145 SHA-1: 630539f2051fc772b42ffc70583355ee792b80cc SHA-256: 867cbceed7f79a6853479c72b0a21fbc661bb58e2f8a64451606c3ec830bfaad
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to disposable hosting or compromised CMS uploads. These links form a link farm designed to redirect users, likely to phishing sites or further malware downloads. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oxigensupplies.com/shipinc/userfiles/files/lisawonise.pdf In PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/85026216307.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed87b90c09---51349095920.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/34832952626.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/pepafibonog.pdfIn PDF document text
    • http://cutyoursupport.com/userfiles/file/84226507765.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/47760031356.pdfIn PDF document text
    • http://warwick-ems.org/userfiles/file/14040011140.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/34561312616.pdfIn PDF document text
    • http://hbaoge.com/upload/files/21007316221.pdfIn PDF document text
    • http://www.ciesol.com/ckfinder/userfiles/files/kilovupulurug.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/xevidexavemopugoraw.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/16814821452.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/jaxesugewevodowebu.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613313086e6be---28201202960.pdfIn PDF document text
    • http://seatraderhk.com/userfiles/koretuda.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f60582fef2---xebesujoxomagerab.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/bewurumosef.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/18578548132.pdfIn PDF document text
    • http://kiemdinhcan.com/Images_upload/files/83484542132.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/begel.pdfIn PDF document text
    • http://pluimveebeurs.com/userfiles/file/92772641623.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/75183106798.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/cn4rk3bfn5s2k8hq13cgnc3d36/xofof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=satyanarayan+katha+gujarati+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.

FilenameKindSourceSize
font_00_sfnt_off0000e295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE295 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000faac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAC 10820 bytes
SHA-256: c516747b9fc11374be943b995f4ea936826ba90f6b1674db52a3690b09153f40
font_02_sfnt_off00011354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11354 17976 bytes
SHA-256: 1a6bfc593376787a4d5767ecf469b2ea95085679f4422921b4726d80a7ba3c52

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