Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e48b725ebd7aa56…

MALICIOUS

PDF

94.2 KB Created: 2021-07-02 02:09:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fdd3cf022f10aa8da385f4e69c1ed35e SHA-1: 9714f4c37c1b7251b6b4d246ec12e7cdfa68f8f2 SHA-256: 6e48b725ebd7aa56d2943e608b4d557dccc19fa683863fe3180569807880eaf5
96 Risk Score

Malware Insights

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

The ML classifier strongly indicates maliciousness, and the PDF contains numerous external URIs, many pointing to compromised CMS uploads or disposable domains. This behavior is consistent with a link farm designed to redirect users to malicious sites for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns suggest a malicious intent to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

Heuristics 5

  • 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://laborke.ru/uplcv?utm_term=bible+quiz+questions+and+answers+from+the+book+of+acts
    • https://gadd-asso.org/userfiles/file/22455560606.pdf
    • https://yingzhaoliuart.com/upload/file/71709400164.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/d944b15c6a9bae0eb45b715a2b306ffb/20579526532.pdf
    • http://artdealer.vn/upload/fckimagesfile/7fd05e6669762c40dad2a4948ee47d1b.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/687f59cfd8fde462b55edc1c9545b8d0/22426251738.pdf
    • http://jevades.com/aircraft/fckimages/file/59217039723.pdf
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/4091183154.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c861774b776---wimugagorojavifevaxuzotaw.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094103bd633a---39937980149.pdf
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/zugevu.pdf
    • http://indecomavo.pl/inc/getumobovosedewuvef.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce9f3c7969---15939981202.pdf
    • https://sheenabusesandcoaches.com/userfiles/file/nepimigirobatidu.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/d28a6pctsmv42qcq643mq43gno/99461109555.pdf
    • http://thankschicken.com/uploads/files/79336132416.pdf
    • https://condominiobrisasdelnorte.com/userfiles/file/roneguvodaworigi.pdf
    • https://hotel-la-licorne.fr/userfiles/file/53183083638.pdf
    • http://skupka54.ru/upload/m/60475485725.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f3f5a06f04835c9846e14e0b54088c6b/dedopebazewetewit.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/1d4a5d28b2c4a43281e6c59e93040887/17372288918.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607514d4a7b9f---bujamumevizanadopepazuj.pdf
    • http://aelma.com/sites/default/userfiles/file/70512783357.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d1273fee4---99700427522.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607120070e434---55700632684.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4cc.bin
3d4a889b59d404af10a179295e57e3de316cddec85ed545a3a981850de7ca2b9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CC 17484 bytes
font_01_sfnt_off000122ae.bin
6d636ebcb28a43c11a0b96216d988d0aaa25e428b847d4e039b2a2a6b6e27b6d
pdf-font-stream PDF embedded font (sfnt) at offset 0x122AE 16068 bytes
font_02_sfnt_off000137cf.bin
28445cfbabdfb242228bdbd523d2b42341f95e32603b68b977ca7acac947401a
pdf-font-stream PDF embedded font (sfnt) at offset 0x137CF 11416 bytes
font_03_sfnt_off0001527d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1527D 16792 bytes