Malicious PDF — malware analysis report

Static analysis result for SHA-256 707409828281b318…

MALICIOUS

PDF

72.0 KB Created: 2021-09-18 12:32:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 524f0169920d26dfb09141e816ec7110 SHA-1: ecc18d0026767db68d43b03f113679595e066009 SHA-256: 707409828281b3184f53108dfd975815111a23f26cbdb0cd33264fa2b7fc341d
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The embedded URLs, while numerous, do not appear to directly host executable payloads but rather serve as redirection points, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://micdelhi.in/userfiles/file/tuvagubotev.pdf In PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/3f315ad116d6197e75af68cd603cfbd1/93580212552.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/776f3e993ee1689fd453231773cd6681/javapupesezujazosonekesu.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/95563135487.pdfIn PDF document text
    • http://seasonmediagroup.com/pic/file/82582022506.pdfIn PDF document text
    • http://rilta.net/userfiles/files/1628349652.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161441d695be5f---lonawovepemegirozef.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/50203796348.pdfIn PDF document text
    • http://kingsfci.com/userfiles/file/96313080653.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/56188336787.pdfIn PDF document text
    • http://avalon-essenzen.at/userfiles/file/4274898257.pdfIn PDF document text
    • https://szallas-karpatalja.hu/upload/46523137827.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/52539717569.pdfIn PDF document text
    • http://alvitraders.com/files/4476538221.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/xufavawunok.pdfIn PDF document text
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/femobizawug.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/zekozavu.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/vizefuvegiboviniwomefu.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/bijufevilepiw.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/jodow.pdfIn PDF document text
    • https://lanegarrett.net/userfiles/file/tavoge.pdfIn PDF document text
    • http://emachn.com/data/attachment/file/73224183191.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=cookie+cats+pop+mod+apkPDF 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_off0000b69b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB69B 10548 bytes
SHA-256: 2c9e0f482893d03c91b7a835c91b96c9e0bf31780093a5da2d2c5f8cb212e2c9
font_01_sfnt_off0000cec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC2 17112 bytes
SHA-256: 395c230e617253895b781577139d5f975660a548fba043652a36f4b9eb76ce61
font_02_sfnt_off0000faf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1