Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fa70264d188e03d…

MALICIOUS

PDF

80.9 KB Created: 2021-09-20 11:16:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: eae915c3d4ebd03e48f608f6bdfdf385 SHA-1: f1aaa3e2732afc2988b5f00444239f69ae1b1242 SHA-256: 7fa70264d188e03d61637154ad88ad4a424ec6a7784adb9d3871fea48230f864
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript (T1059.007) suggests it may be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://mgtuae.com/uploads/file/gejasefakujujepopiwazasa.pdf In PDF document text
    • http://jump360.co/upload/files/20210901123456.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/37868100504.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/88463303578.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/xunenipoj.pdfIn PDF document text
    • http://xn--b1adrijbbb.xn--p1ai/upload_picture/37895198364.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/14179242249.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/66043810516.pdfIn PDF document text
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/19941306025.pdfIn PDF document text
    • https://senfina.top/uploads/files/11519630558.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/80219196281.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/83559075611.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/files/15108726108.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141bb100aaf2---3213062018.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/84220825784.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/dasajazuve.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///lesawagasuziruv.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/4bf30b727848bbcf33a78996d8db3169/36393185756.pdfIn PDF document text
    • http://gainliving.com/upload/editor/file/19663903723.pdfIn PDF document text
    • http://toitureetfacade.fr/data/Files/59643480893.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/61912436852.pdfIn PDF document text
    • https://aurorabersinar2.com/contents/files/27940494512.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/81011585812.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16133c44a147fa---pujamakemew.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/98499747234.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/rudireralarosajekotisi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=apk+editor+2018PDF 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_off0000cf92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF92 20504 bytes
SHA-256: 39b8afec17621e6d7687410ed9c33228f3d97c4bb51279cb7db84105be4c61f8
font_01_sfnt_off000105a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A1 10480 bytes
SHA-256: d8e55d6a1ff313f5580b0e19090cb3354afb9e4740eaeae9ec2324529d5104ce
font_02_sfnt_off00011dac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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