Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5390072d6241f16…

MALICIOUS

PDF

70.1 KB Created: 2021-08-30 11:52:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 17f20b33f6146e7a02b31a5d5b17965b SHA-1: e99d17504393f6dde5919a607df7a8b4aa590ff4 SHA-256: e5390072d6241f16993c6c3013789be7f0efc65b130d59c76a14833c308706dc
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its small size and image-only content, typical of a screenshot designed to trick users into clicking embedded links. Multiple heuristics indicate the document contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or redirect users to phishing sites. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest malicious intent, likely involving the execution of embedded JavaScript or redirection to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 70 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf7b52c3a9---8784644891.pdf In PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1610b70aec7b44---24278859426.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/wififubenesadasu.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/be51c51aedd72bfec9be899a8b21675c/dojeb.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16097bcb6d13c8---53436364025.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/79932250441.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/gapiwotafewijizopisokadew.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/62989502999.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kerawinuz.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/go4mq17g0st5g2pih851kimp0o/jerufevemosilel.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160b090d3c2b18---divulozewovilasataso.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/zepilegened.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/cci415pgffvdv2dl38u165pp71/5197780101.pdfIn PDF document text
    • https://capital-tic.com/upload/ckfinder_temp/files/20210526205656.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/feboresimajojow.pdfIn PDF document text
    • https://zakarpattya-tour.com/upload/gomumisugaxi.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c5292d9b877---16193742248.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c4d777f66---rapapozudumolak.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf845bb7e01---tufupozigepunavidaja.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/63341879305.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/nulabaradolasokagir.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/32636003038.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=similes+for+class+3PDF 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_off0000b780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB780 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF97 10544 bytes
SHA-256: 407b0bf8c360a0bf04deb28d57c3861884c7cdc5c74aa99f5491d8c13c140b56
font_02_sfnt_off0000e792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE792 14088 bytes
SHA-256: 0ae4af04d3bff294e15709dd5d98fac3ca3a63cfaa2ed46b00384044a06f1d38

Open this report in the interactive analyzer, or submit your own file for analysis.