Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc22ab38bdb57fb3…

MALICIOUS

PDF

82.4 KB Created: 2021-08-18 01:29:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-24
MD5: 21201ccd128fefbb105fde4a140589e9 SHA-1: 75d41051677531302cf2235c588876a8b4a48b61 SHA-256: fc22ab38bdb57fb3e92a6482b2aac9451710351ff1f7ea3a3ab8320b5ad6b058
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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.
  • 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://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/1ea9ed5598f1d7ba0f054c83359cabe2/mavagojinipixa.pdf In PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/624ad3e697ea036b43ead4a1f1afe1a9/73423982739.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/relokonobo.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/78724150882.pdfIn PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/rezob.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/76f845d383b02b0b43dd86710359f89f/biteporanes.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/rojalizekefokisowiwebomaw.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/ruvagituduvevubifuvo.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/0fbd02dac7bffc907bee9fde9ce76827/27031456557.pdfIn PDF document text
    • http://contextuae.com/resimler/files/55317522774.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/25555015104.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/rimufigemat.pdfIn PDF document text
    • http://brlairport.com/images/file/45186316299.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/sitafe.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/b61636849241639aa5bb99865f92edd3/4612403572.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/00f84d63967f74625148d6340f32a4b6/ralanoxitolibonubebazis.pdfIn PDF document text
    • https://combrooncom.com/contents//files/remozalupulukuna.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/43244715085.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/8afdi0dspfqh195a0uo8th1evf/pabifozep.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/99530885550.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b6277b320---45313186777.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=dell+mih61r+motherboard+specsPDF 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_off0000db39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB39 18924 bytes
SHA-256: 17d6f90e7b4e1bde00193665471ad565b02052d6e848a59181ff2d4d16bab886
font_01_sfnt_off00010a14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A14 11036 bytes
SHA-256: 88a7c44c0f0dd6f13c81d02e8a54a0b25d4563088f555f9598f7400b34d29db6
font_02_sfnt_off00012384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12384 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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