Malicious PDF — malware analysis report

Static analysis result for SHA-256 2280b124e8d10fec…

MALICIOUS

PDF

89.7 KB Created: 2021-07-07 21:25:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6b68e0d26c62fe358af8326001ea1c53 SHA-1: 5f5f866bbd3c78107af74669c7d5028fcf49ca63 SHA-256: 2280b124e8d10fec3850b3e79937f00894490531b73bdc9e27b374e0c9ce7705
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. The presence of numerous PDF links on potentially compromised CMS uploads and disposable hosting reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/d66ebbf288804e5fb2af6157a369380a/74309476650.pdf
    • http://imailbox.nl/images/uploadedimages/file/gaverorozawepilepif.pdf
    • https://zlatartopalovic.rs//files/71962630737.pdf
    • http://mengnuanua.com/app/webroot/files/files/najito.pdf
    • https://mps-india.com/userfiles/files/ruluzizazujitipeg.pdf
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/78164945140.pdf
    • https://ltssinternational.com/res/wysiwyg/file/44564464902.pdf
    • http://digitalpolicycouncil.com/imagenes/file/vazuzedaruw.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0fb02b1251---40273855706.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e039135fe6---ziruzok.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/9u6tg9fapu1af8olnl7t3ovcns/ragadobulojozenusodixu.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/hkj8v0n2u3d6c9ct75f9m3d321/fedamepivaxilu.pdf
    • http://globalbando.com/DATA/upload/files/202106221835436143.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/u676fi0252es0danf0174vk2hf/kilegijonejofet.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/a5c5e2b2bbbd41fb9cc43e555e42ac41/28402220703.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c73fab60f2---xixisozugupox.pdf
    • http://watthaistuttgart.de/userfiles/file/linibomenagedefovenozogix.pdf
    • https://anukulagrotech.com/userfiles/file/pajobewofa.pdf
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/cdf76eb5157fcd41b1a34571c4a89086/legusowakik.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071eaee69f26---11321590269.pdf
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/4eb082e962f3640e74c3700ef24c8033/2852540228.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/c55e902770c0f43a019e1852f80abe78/jerubakinoramobisaz.pdf
    • http://moscowprice.com/content/xuploadimages/file/44945465412.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7b184c8243707f18fb834ca758c5ffc5/28386028450.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b51267f6da---punesenukifas.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+add+a+chest+to+a+horse+in+minecraft
    • 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_off0000f3eb.bin
9694bbeb70707555cbda46ea76b70a3063c20b2d46cf4e03e5a8e9b5f057b4b1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EB 10772 bytes
font_01_sfnt_off00010c8b.bin
9c7985e92e916e91436cbef027981f125382721d5fb1390c95c0d3dfdac35f04
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8B 19688 bytes
font_02_sfnt_off00013f49.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F49 16792 bytes