Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a50dd0678606556…

MALICIOUS

PDF

80.9 KB Created: 2021-09-12 22:28:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 87f7719a700117211757a7012493c672 SHA-1: ec682adbd7499b195e264424e53e236f2a701c65 SHA-256: 7a50dd0678606556998f031d866f2888fd6fa3140c5f3678926537fa1e9362a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple disposable domains and compromised CMS upload storage, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the presence of numerous suspicious URLs is a high-priority indicator.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://aasghsflqsae.handylover.com/upload/files/35385011032.pdf In PDF document text
    • http://thucancakoihikari.com/luutru/files/nuzedigisuxodonuwokul.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/fovaxitiwizekiti.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/17261194531.pdfIn PDF document text
    • http://coquicart.com/ckeditor/ckfinder/core/connector/php/uploads/files/linesilotudelowusux.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/ac31792b3d779287c513af7e625fc993/jibos.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/54579484209.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/a25972b80f87b71dd2cd3c14f9ab39b2/27133729300.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/26759215172.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/fudimepoluxatewateze.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb910343d4---85669197014.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/78913110024.pdfIn PDF document text
    • http://hamzalegalservices.com/userfiles/file/86119934687.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/tininoto.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/vegivale.pdfIn PDF document text
    • http://bojovesporty.cz/userfiles/file/84489783417.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/26811320223.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/87465513650.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/87114772136.pdfIn PDF document text
    • http://myphamvickwhitebeck.vn/luutru/files/juzoluwaregajo.pdfIn PDF document text
    • https://wasael.com/userfiles/file/73405063208.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=angled+curtain+wall+revitPDF 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_off0000d5ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CA 18492 bytes
SHA-256: b031d5426f0ead63f5861b1b4f9bf6ce6ecf7a60f262f87e87981024b352de86
font_01_sfnt_off0001063b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063B 10492 bytes
SHA-256: a7bced704c68c9c5d3445defc652084a4187a0fcc286c032e558d7d4d90269b3
font_02_sfnt_off00011e09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1