Malicious PDF — malware analysis report

Static analysis result for SHA-256 1425f784588baeb0…

MALICIOUS

PDF

85.8 KB Created: 2021-09-07 00:26:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 69e092bcfd3a78bce4b03e969429d364 SHA-1: ba12288c3ac712760db0dd33154c01a5a001a353 SHA-256: 1425f784588baeb0108c55a9b60cdc5480c7aabb288f59bf581b80beaad6fdf3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of JavaScript suggests an attempt to execute malicious code or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/50640612518.pdf In PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/730b6ae0ea5f431442c19eb925fe7866/lujutage.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803b27e4b37---83486588293.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/pivibek.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e8484397fa---kivitebigap.pdfIn PDF document text
    • http://wajl.net/img/file/202161284529.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/0a8ajgfrho26358qjedh4hcij1/rufunalutegemizi.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/502c02b3d22727fa4700788ef368c3af/kusuwanume.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b437164bbbf---sobezasibirerutofo.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/fozonudoluwageboku.pdfIn PDF document text
    • https://stiglic.sk/userfiles/file/fidugesu.pdfIn PDF document text
    • https://quangtriasianwindow.com/uploads/image/files/buponoxej.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/nubemapim.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/0ffc108a570858bd93b57c99a421b161/63197210824.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e646117721---33760938137.pdfIn PDF document text
    • http://zuestag.ch/userfiles/files/97627058392.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/supofosodaliv.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/sasusafugonuko.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b834e95a842---xoxofukejowedotas.pdfIn PDF document text
    • http://dnepropress.net/files/file/50140785781.pdfIn PDF document text
    • http://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/74805427388.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b05c5bc18---fudevepisodudazix.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/8981824839.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/njf3a9midpfqdfiv885jdi6nd0/55714430218.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=download+lspdfr+mod+gta+vPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3AD 10768 bytes
SHA-256: 1abb4f859f0601b663446f6f76f1a2b1416cfa617eb981033028604521bd6f78
font_01_sfnt_off0000dc4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4F 21304 bytes
SHA-256: bfc1ab700eb5b94b758d28c477937a962e734fe53e8037e25dd49aca9ad90cf1
font_02_sfnt_off000111f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F8 16244 bytes
SHA-256: fddcbe21bdf9fb2753729b4ab5b26d7a3fbb01e3fe51d41ab0725360e25c189d
font_03_sfnt_off000127dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127DD 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_04_sfnt_off00012fd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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