Malicious PDF — malware analysis report

Static analysis result for SHA-256 850e9c5f72828312…

MALICIOUS

PDF

92.3 KB Created: 2021-09-04 14:55:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 62b31cae832cc39e79cfab9f9dfeb1a0 SHA-1: f78b3db8231690dab76dfa5d3f979e7cff663c63 SHA-256: 850e9c5f72828312ccf8e40ca1e5ec38e3d95858536c4a60d2c39be8ebfebb9d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs and links to compromised WordPress upload storage, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://coretry.ru/uplcv?utm_term=impact+of+imperialism+in+africa+pdf PDF link annotation
    • http://vinacafe-dalat.com/Images_upload/files/votodulowegosatux.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d01ecd9690---47118906289.pdfIn PDF document text
    • http://bjxbw.cn/userfiles/file/likatozusodumijidereroti.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089db40b7257---duxelaxokuxinojojikebus.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16127046091a17---97048002168.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/jejesofuxosadarag.pdfIn PDF document text
    • https://radio-aurea.eu/files/file/19050543975.pdfIn PDF document text
    • https://anfauglir.com/images/file/13684966081.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///20210723205342_353181635.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/86625991154.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/6a66780acfcc764d4b500ce9c3826592/25297136638.pdfIn PDF document text
    • http://sixtyguildersresearch.com/admin/photos/file/kisigol.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/b21567d824b1574be016463768c5469b/95417397478.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/vitovorunimedigikafu.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b5d3cd882b8---nisedurar.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083100c9b5b8---86475409864.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/93290326864.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/33248630661.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/95059176201.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607471db8ebe9---bidelegukokokuwimev.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa4be30c2dc---zewubemupajabe.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/71e2d3fef50cd8957652f536f28f8916/pujulidosezasufolarot.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/83508342277.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_off00010135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10135 10732 bytes
SHA-256: 3b06591b7dfb68f7d92fd1ab9c42a40a3c30a7fb3a18262cdc190079e597df55
font_01_sfnt_off000119d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131E6 19192 bytes
SHA-256: e392379975f591a781e16a19b938ed4c117857ad8a8bd66132766c8723e1e4ff

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