Malicious PDF — malware analysis report

Static analysis result for SHA-256 1390c7b6a0496cf4…

MALICIOUS

PDF

89.9 KB Created: 2021-09-05 23:57:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: dc01ef6d4cd984833485a43753a91441 SHA-1: aeb0b2a74dffb612780f7a898f4bfe357aa0800d SHA-256: 1390c7b6a0496cf48c450c71b4f84508b256904f3cee490d890c8863eae28746
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve further malware. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16075e9dfd711c---zelerebuwixiremakewumov.pdf In PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613342762126b---zujudonidubituxozeve.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a918b040971---vufik.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/8gj8jafkh98ul40n24useh3mmb/netebufijemu.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/cad2989dfe48e0c079bcefb205b9be79/15715133982.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160feb3df87bd4---51662920316.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/44114666081.pdfIn PDF document text
    • http://bodymindspiritconnection.org/clients/5/53/53f1eac0d8ee32431a47b4e1af774f29/File/61605025277.pdfIn PDF document text
    • https://frontlinetherapist.com/wp-content/plugins/super-forms/uploads/php/files/5657914fcd1ca1022fe47f2f1a31dd1a/86515417795.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4fee9f2c19---wafisigoludatiku.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/binej.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/1348316533.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/chol2ia5ur5adcup84cm8436dk/fudakejakir.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/57385805713.pdfIn PDF document text
    • http://hongdacable.com/d/files/nugubalumivewatenoxi.pdfIn PDF document text
    • http://nensi.si/upload/file/51768233902.pdfIn PDF document text
    • http://eaupureinternational.com/userfiles/file/64813660483.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/sojogi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8d7789af4---fopumamexas.pdfIn PDF document text
    • http://fautographie.org/images/userfiles/files/33742186082.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/90244880767.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/35049572562.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/pqsfga02ejt8337he5qut68ij3/76465410986.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/j3mb86gb2u34js9ooij5pbnn5k/nowagere.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=strong+versus+weak+acids+worksheet+answers+pogilPDF 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_off0000f9ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111BD 17708 bytes
SHA-256: 3c160f1479b7663b1ffa86807c6d9ce1eaae68e1e6161371db2ab45150f60c1b
font_02_sfnt_off00013fd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FD5 11212 bytes
SHA-256: fa1fece0634d0773722d06b0925631b0efc81600d9ffd04c5ace8785c9ca1e6c

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