Malicious PDF — malware analysis report

Static analysis result for SHA-256 9104d103f1373fdf…

MALICIOUS

PDF

120.3 KB Created: 2021-07-14 07:10:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 491f3b4a170c9ab8a7e2af3d8b09ae48 SHA-1: 6b2b742fdf191f87023525602cee631dbcd44af4 SHA-256: 9104d103f1373fdf576b9b6887d622a9cae05b4e8eaf303ecefd066cd2a1bea9
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's part of a phishing or malware distribution campaign. The document also includes a visual download button and instructs the user to install remote support tools, indicating a social engineering attempt to trick the user into downloading and executing a payload. No scripts were extracted, but the overall structure and heuristics point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jetaime-shop.com/files/zawajuzufetivajo.pdf In PDF document text
    • http://esejsc.com/upload/files/23098198882.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/7679313819.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/gulutelasaxovolu.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/68usv9169bji4mb8tlltq1dck7/47186868242.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160cca33249020---90663102210.pdfIn PDF document text
    • https://wita.lt/images/files/xuliwavufake.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16086edef177e4---kovovuripavurafelo.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/mapevuvigeganu.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608efde559a68---zorudodujaburod.pdfIn PDF document text
    • http://refta-bg.com/userfiles/file/58610928287.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b146324e1---lakedamudejurufokogakexo.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/sobexewa.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16075daf85c70e---39275049683.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a912b67edd1---79260702689.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc94d88df7---wogokunazixulabagefofofo.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/90416016395.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/ad8da46f98558f781ab226768edb7841/49185486945.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/t5dp921hmfclurn2l3o6hsbci7/99947935142.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/n3ed7fj3ojv6gaatnf91dg1990/mofivupidegojo.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa4df02cce---43528573680.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/aebe423b5d721b7d0454fd50a8362712/rofif.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/9a36b51d9a7913dd5fd996c31db1fca6/wunuzigezulefujediriku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=stata+16+for+mac+free+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15116 16912 bytes
SHA-256: b6c7213960f54ead60f9b1bd1fd6482a71210f1d96971f15d8ef78e75e294e2d
font_01_sfnt_off000169b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169B9 10756 bytes
SHA-256: 58bdd4d30d9cf92815663735edff7e4b0f3d762b4df9266998012d06c422f30c
font_02_sfnt_off0001829c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1829C 24908 bytes
SHA-256: 2d7048d38922b6c0da216b16101aa0ca680178af491708b3f061ee8e4c485aac
font_03_sfnt_off0001bb39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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