Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b0b7941e6953b5f…

MALICIOUS

PDF

83.1 KB Created: 2021-07-09 11:56:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 706009351108eb050b46528c8fc8ca17 SHA-1: d28b131d41137978221f0d0ba4a0e8dad244c97a SHA-256: 9b0b7941e6953b5f7c6d6faad51033ab92645dfb07dd036acf6ac0bdd143a834
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://synerhu.ru/uplcv?utm_term=compliment+words+that+start+with+j
    • http://onboardviaggi.it/themes/userfiles//files/57602842035.pdf
    • http://gilleyfamilyreunion.com/clients/6/6c/6ce887ac6ce8bbcacf46524318b1f362/File/buxopapexibitubefivole.pdf
    • http://timandlor.com/userfiles/file/lusejazax.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c1df3544ab1---95891092328.pdf
    • https://butterfly-propertymanagement.com/userfiles/file/15730421375.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/029ddbe4f3b02bd64d4b762401862927/49859731517.pdf
    • http://weddingdiy.cc/uploadfiles/files/20210606_070148_5645.pdf
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/jl6dmk2njdr7697inpu0t12jv5/60012059666.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/q3btpe161b9f4qlnm5q7aiaf70/buxagusuvazarixe.pdf
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kirovanolofixotutuwebomo.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/872d38d8b5fe874aa99cfd97ce124dad/42357782267.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc94417274---demoramiwawagavilexo.pdf
    • https://balaji-technology.com/userfiles/file/zawituxepizarak.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d907e6b78a---dimisolaxumibi.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084ea20dda2e---xunamerusileminopurutef.pdf
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/tefipefoboxuwoneremulezam.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e88ace327---wagexovibef.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf87ccb92e8---zewopadivugoz.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abc6672f121---48036629410.pdf
    • http://mu-rrrc.com/userfiles/file/27582060444.pdf
    • https://folklorebridge.eu/uploads/pictures/files/semopemijafamesidojixebe.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/d4ce8b3e15a9caeb172a21405e19cbd5/31533647542.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/d37f7cb5c33b4a8e0d084502c4878cc6/93849959103.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/b2cf31a0571926184a490639aa74f49d/vavigefuzikusivebuviru.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbcfec13ea---vagonuwe.pdf
    • 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_off0000e363.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE363 16792 bytes
font_01_sfnt_off0000fb75.bin
0eccaf076205773d3b23fb66554fc914bc2769a7c094732e67f9493889c92cf8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB75 16588 bytes
font_02_sfnt_off00012600.bin
2d6165c619717d5798133facdd0fa885b87ae720c220abec80a7fcb72b92799f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12600 10904 bytes

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