Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6c990ef18baa77f…

MALICIOUS

PDF

116.1 KB Created: 2021-08-17 20:27:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e4e94380b0edc0a1de486a9ba890a2ad SHA-1: 540e7f07165a2614b3375057ab2734117b6026ab SHA-256: e6c990ef18baa77f993195ea0b694904baa1f4d5f075082074679b65e47eb6c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to compromised WordPress upload storage and other disposable hosting sites, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the URLs and the PDF structure indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://museeducuir.org/upload/files/9941392716.pdf In PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb59c82c6b8---76035823497.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/pubetekasojunadavud.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/d722a1fe98486b0a945793c3d74e9de7/34610921651.pdfIn PDF document text
    • http://raisemoneyonline.org/clients/6/69/691275cf9a36cab982b2498ebdc715be/File/79001260246.pdfIn PDF document text
    • http://baobiachau.com/luutru/files/3880883993.pdfIn PDF document text
    • http://septumdent.com/img/userfiles/files/92909409266.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/85502563497.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/29158030065.pdfIn PDF document text
    • http://famillespourstarlight.org/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/96417542463.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/43739834176.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/wolonolonijexafi.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082567dca5ce---taxeduxajenewudopabivet.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/63095049151.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b93b66818---gaxujugekosudanade.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607155b04f688---bajexigasenisifo.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c13496759---23533429144.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/52449917920.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160812441745d2---makubibisemugozolosak.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/vusugizev.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc760211407---xitekanekomejujavevutuw.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/u8beab99821rl6c365pbmunha3/bitepibenefibuwob.pdfIn PDF document text
    • http://minhanh.com/files/zisozemakudawoku.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/6473498819.pdfIn PDF document text
    • http://cityhelps.org/clients/6/61/61afa7a028a8e04f14432b0fece6f2b0/File/48002399132.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=norton+field+guide+to+writing+5th+edition+table+of+contentsPDF 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_off00015f7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F7C 11192 bytes
SHA-256: d3537ea9ec0f9a1b44ebef41713796c97bc7c78d72c9db4a5cb0cee14d22ed2f
font_01_sfnt_off0001797d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1797D 18008 bytes
SHA-256: cd2ee6918093518e207e79f102dad1a58463ea7109f763ce91ddfca30c0601b3
font_02_sfnt_off0001a919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A919 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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