Malicious PDF — malware analysis report

Static analysis result for SHA-256 e658d7f3e63059a7…

MALICIOUS

PDF

81.7 KB Created: 2021-06-25 12:22:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 42b3bff9b5e2012bf70f49c781184bff SHA-1: d9020abac38a449fdc4a083ac1282cbd789c163a SHA-256: e658d7f3e63059a737d2da194eb93dd18a247f9bfa828a053a4bb057bb9c4780
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting a link farm used for phishing or malware distribution. The presence of these links and the overall structure align with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/aea7fcf4bbc0e40e5d3f3cb964a6b094/42405947027.pdf
    • http://abwjefferson.com/uploads/files/fupegurufuvu.pdf
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b21bff7c9a3---turofuxuf.pdf
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/km0abhuoa3hphvf1q8197alae1/mopopimivav.pdf
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/7g9drc8u417q4id5iohnqn21k2/zojixifupi.pdf
    • https://vicotelecom.vn/static/source/images/file/38844064050.pdf
    • https://armagedonspedycja.pl/files/file/jinokasojude.pdf
    • https://electrabicycles.pl/app/webroot/uploads/file/16213026630857.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/620d03cf92ea77b87f8514c37c4fb970/74169285903.pdf
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/79092428424dba9bd70cf4050fbf757d/24470554137.pdf
    • http://meruzhankhachatryan.com/app/webroot/files/file/70788367219.pdf
    • http://jinanxintiandi.com/userfiles/files/89745393216.pdf
    • http://pathtojanna.com/userfiles/files/balekujutujelomoxuriruj.pdf
    • https://ost-fogging.com/upload/files/45583511710.pdf
    • http://writtenmail.com/upload_images/file/82714842716.pdf
    • http://alexlunacoach.com/img/editor/file/tapegibepejited.pdf
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/9fb3e4ecfcfb8b3e9185f8a21f165822/30957201855.pdf
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/c0b343f886fc8353f1b8070ca9e5e80f/86412009916.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=sunday+bloody+sunday+guitar+chords
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbea.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEA 16792 bytes
font_01_sfnt_off0000f401.bin
1429180995dafb24ef2ea559cb5c18881fe2ad200761beaf8b7b292bae8bc299		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF401 10948 bytes
font_02_sfnt_off00010d1c.bin
b161b9f2cfabe4b4effcb24c5518fe22ad01710d834baa5e6d2a47b955998d67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1C 17140 bytes

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