Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb9d0819da57668c…

MALICIOUS

PDF

77.2 KB Created: 2021-09-06 06:48:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f9478483adf367646b04e4e7db9f537f SHA-1: 033f213e7c5114612b5866c5e614945991bb33d2 SHA-256: cb9d0819da57668cb2a31cf5c81124da2ef31b3a5eece71900edd7091068bef2
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 compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a secondary payload or lead users to a phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://ckd-otto.com/contents//files/totozuwewugerafefotuwarul.pdf In PDF document text
    • http://hgbs.de/userfiles/file/mepeduwegazopotu.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/aaa13f9ae57f43b64ec754888b3dd15d/dosukakemof.pdfIn PDF document text
    • https://vroa.pl/chplusfiles/file/nuxizivutud.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4d2a90a5c---pitemigubajoz.pdfIn PDF document text
    • https://icrs-as.com/userfiles/file/25069513680.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/76764949993.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/gupegopobisufeladomif.pdfIn PDF document text
    • http://usmleworkout.com/files/file/fupiged.pdfIn PDF document text
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/b6065c4287208530b75a5ff88fffd7b8/jajogupatosebokoveveregi.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610930e8e6154---35898265043.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c61e95ed115---42880652532.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160909f9f92fcc---22416067780.pdfIn PDF document text
    • https://cpc-serbia.org/js/files/37080376502.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac97ffc4325---patupuzamilevakusetezo.pdfIn PDF document text
    • http://short-story.ru/upload/file/14577265812.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/vekupivinosuxufol.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/fobadutowujoni.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/79bafdcd48adcfaf39d5bfb1c751daf3/79862686694.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/9ntbb2hrtm1fuo8t96bejfsij7/gojunulovo.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/fozepimuzomewogape.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/zonodaw.pdfIn PDF document text
    • http://trubaopt.ru/content/file/7624929801.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/ledanepazizadibimozumarif.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/jenafowugimimuwolopip.pdfIn PDF document text
    • https://aedwea.com/upload/foto/12665626282.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=inverse+trigonometry+formula+pdf+downloadPDF 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_off0000c5ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCC 18076 bytes
SHA-256: 76337150c6ecbf748e69428f86edf82a5b1fd001b70a1f401c3e05199a90abb7
font_02_sfnt_off00010cd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD0 11156 bytes
SHA-256: ecc2b588bee3854db249e8300cb591a658168230bb1c0ad6736ef5375a15c902

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