Malicious PDF — malware analysis report

Static analysis result for SHA-256 158a29c8de76d31d…

MALICIOUS

PDF

89.9 KB Created: 2021-06-28 04:02:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6891f1300acbf5e2b245a9b48bf53259 SHA-1: 09a9e62c8da9c0096253ef6a1843b20072fefedf SHA-256: 158a29c8de76d31df34d71d4642043918233164e9e4f18686e88120c81f748b6
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure as a link farm on potentially disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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.annaleehuber.com/content_files/file/diganinetiwaxanal.pdf
    • http://aircond.md/upload_fck/file/64305349039.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e4a72d21e---zegurejesuran.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607332ebedf49---tozekivewaxerumuxof.pdf
    • http://alexanderjamesbackcatalogue.com/userfiles/file/87002452859.pdf
    • http://derma-dts.de/files/file/vexov.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc7d9028d1---21764455541.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3ee6b4283---vezavazudinaf.pdf
    • http://zabradli-znerezu.cz/userfiles/file/givukusavi.pdf
    • http://goref.ru/files/file/56296623770.pdf
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf57ca561b---biromukenogodov.pdf
    • http://kipia-nn.ru/userfiles/file/96670786643.pdf
    • http://insureacompany.com/userfiles/file/lezewivomegol.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb7593359c---midasuvanovotojajix.pdf
    • https://tims.ro/ckfinder/userfiles/files/wepitipi.pdf
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/767fa95d5421d783408c2e8556776eac/4016886907.pdf
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609de804aab1b---rutulidewas.pdf
    • http://aylincinarli.com/fckfiles/file/80043296607.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/26em7bmf9hhtosp3p6ggktvai1/18610141563.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16079047751d03---jaxupiwapamitu.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab38e7e6db---luvurajufokamesesixetedin.pdf
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/bcf84cb7558006194a5f344416210462/gedepijirujijow.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/f9880272c3a4283aa2e2e74ed6c92ce8/18497186240.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=japanese+candlestick+charting+techniques+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_off0000ee8b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8B 16792 bytes
font_01_sfnt_off000106a2.bin
384fb2d2a722818e438cf674a6568477da11b5df758a07e9340c515366e1ab12
pdf-font-stream PDF embedded font (sfnt) at offset 0x106A2 11108 bytes
font_02_sfnt_off00011ff2.bin
236eda816d7c2d4399241db957a10a1f2893d1d373b66078a47a9ce4893eaf77
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF2 27768 bytes