Malicious PDF — malware analysis report

Static analysis result for SHA-256 2375c1f434319e89…

MALICIOUS

PDF

81.0 KB Created: 2021-09-18 02:45:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cfb29c510a178006bdbfd0dc0a591868 SHA-1: 07853b9b43b446319023e4d7144cd0e286e73c4a SHA-256: 2375c1f434319e89d74b23bf805290e1d88aea4dde72d4c0ab41cbda0809d889
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for initiating malicious actions. The JavaScript likely redirects the user to various external URLs, as indicated by the numerous PDF_URI and EMBEDDED_URL heuristics. These URLs are often used for phishing or to download further malicious content, aligning with the ClamAV detection of Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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 https://crysiq.ru/uplcv?utm_term=how+to+set+a+video+as+a+live+wallpaper+on+iphone PDF link annotation
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/sujonoperutirunidem.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/lomisizezukewusudina.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/512d4e68b9c0ae0819f98937fb533104/samovigilozizagonujipaxi.pdfIn PDF document text
    • http://kubkao-kubpla.com/userfiles/files/17357637057.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/gugosawipimozu.pdfIn PDF document text
    • https://icrs-as.com/userfiles/file/jaxesediroluvepe.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/xowojuge.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/77473023094.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/namosoko.pdfIn PDF document text
    • http://specialcats.nl/media/files/pipak.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/nogosogafuruvajovedo.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/32606100752.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/18159360878.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137caae39903---21827738701.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-13/20210913163702683253.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/tibejudilugasujinovo.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/safosemizasu.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/40414367739.pdfIn PDF document text
    • http://ch-bovi.com/upload/files/9976213428.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/66257759163.pdfIn PDF document text
    • http://cwpni.com/userData/ebizro_board/file/luvofasubuxarolil.pdfIn PDF document text
    • http://redeyeldn.com/userfiles/file/82956475579.pdfIn PDF document text
    • http://abnigakgdsg.friendship-match.com/upload/files/77670284328.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1613dcf3ed49f3---4503419423.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/navudum.pdfIn PDF document text
    • 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_off0000d9a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BB 17140 bytes
SHA-256: 0cd9b2da6ff00e448498c54ee1b1c502a46c23469c11edefa0021abeab1caabb
font_02_sfnt_off00011dac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAC 10632 bytes
SHA-256: cf153faf687f0ea6768c79a0c74f431a78812afc6295186e3de680b66241d643

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