Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ef0d49990e2429b…

MALICIOUS

PDF

87.5 KB Created: 2021-07-19 00:57:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f03a9c10751a430d03d915ec4deb5eb4 SHA-1: 1daf2f40b052fa0c2d801100a1e5d5efed7fa609 SHA-256: 9ef0d49990e2429b13b5e650d57089ffc46943d2b4fd76d27613222f3f814d86
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed as a link farm to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, aligning with the observed link farm behavior. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution lure.

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 http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c6cde5514d9---57088475240.pdf
    • https://ssvacancy.com/ckfinder/userfiles/files/18563549197.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3dad48a7a---fofuwenil.pdf
    • http://www.aqsclimited.com/EditorImages/file/gidafelib.pdf
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/7dbf15beab8262627adc0632fe0bd7b7/fetekivekukitupinu.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/h8rnn1hoktnhh2bskhmlf3ehbp/gexiwuwawetutajunoti.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/37cs1o9d166po59sempt7hv3td/23002424998.pdf
    • https://hyundainhapkhau.vn/upload/files/zunetilerazopiz.pdf
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/4c7984c99cfccf5a17e19d1ed5b664ad/2648413025.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b22d9fbea8a---zomulorugedaralimu.pdf
    • http://lungshingcentre.com/userfiles/16019873330.pdf
    • https://thokhoavietnam.com/upload/files/bixebe.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/i2dvg4l7am5k97nj2ugkujtn7n/83192790411.pdf
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/39951676983.pdf
    • https://iword.de/userfiles/file/89843579895.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160d9044b9fcbd---86259380857.pdf
    • http://tysons-cafe.com/uploads/files/maponirobawugilibux.pdf
    • https://uleiuri.ro/userfiles/file/61758484787.pdf
    • http://ccswcd.com/userfiles/file/94692081787.pdf
    • http://uniroll.pl/user_images/file/rakaxewoluferusodixogugi.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607840f06b363---84767436008.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d5faa440f2a---norunijude.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/llegqluq5nbp0jj06g5tiffte1/94893760395.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/5cbbb672cde7ec49e64a7c82f9d7dca9/17218608968.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+say+big+in+spanish
    • 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_off0000f26f.bin
c9e103de8156459c9fd7f7ee8aeeb8a8440385ba63a7f2a9fd3e1343366e0e82
pdf-font-stream PDF embedded font (sfnt) at offset 0xF26F 10584 bytes
font_01_sfnt_off00010a55.bin
db700cf22edc1dad7534f9e63e4ae05875d31eff0b69d8c2c0827207d1a626b1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A55 17972 bytes
font_02_sfnt_off000138b2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x138B2 16792 bytes