Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3dff955d72ae805…

MALICIOUS

PDF

69.0 KB Created: 2021-09-19 22:06:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7d540432d950b7b3fe0cfbc4b027db2e SHA-1: a31ff92afb400ad492b3f12c9e0a10dd8e4016cc SHA-256: d3dff955d72ae80549cf2979c416e631a3be8ce2a6be38bc60ecda8261450e18
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only lure, typical of phishing campaigns, containing multiple links to external sites. The heuristic 'PDF_IMAGE_LURE' indicates a screenshot-like appearance designed to trick users into clicking. The presence of numerous URLs, many hosted on compromised WordPress sites, suggests a link farm intended to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://drafthe.ru/uplcv?utm_term=getting+over+it+android+free+download
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1ad2c8981---37399592643.pdf
    • https://gizaviation.com/uploads/files/fidemixikumevib.pdf
    • http://re-media.ru/foto/ck/files/14669217231.pdf
    • http://print-printonline.com/ckfinder/userfiles/files/xeferag.pdf
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210911_89C4BC287843BEEB.pdf
    • http://angel-conference.org/upload_fck/file/2021-9-2/20210902222114803564.pdf
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/70688425625.pdf
    • http://azinsaghf.com/cache/fck_files/file/26809773600.pdf
    • http://munnartourism.com/uploads/file/18031593689.pdf
    • https://kmkmekanik.com/upload/ckfinder/files/35867720710.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/63a6b008852161c24775a6ceaf4eadb7/bidagijekaki.pdf
    • http://xinxinhouseware.com/uploadfile/files/60050819774.pdf
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/5082068030.pdf
    • http://apart1day.ru/file/63749815471.pdf
    • http://electriccityusa.com/images/fck_uploads/file/nevakezosi.pdf
    • http://aj-freight.com/ckfinder/userfiles/files/86379622193.pdf
    • http://www.anieliasfx.com/uploads/textareas/file/finabigirizikuzirik.pdf
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/lawanimezopegapawaba.pdf
    • https://alperbehang.nl/userfiles/file/felaxozuzunax.pdf
    • http://congtrinhnhaviet.vn/upload/files/vefenoxu.pdf
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/nuviteda.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fca57d1bde---12286059178.pdf
    • http://www.madiran-cruduparadis.fr/ckfinder/userfiles/files/20295958417.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b278.bin
850981cbd61f3ffcf9873d2d22006e6301a80041e2655828a8890cedbaa941fa
pdf-font-stream PDF embedded font (sfnt) at offset 0xB278 10552 bytes
font_01_sfnt_off0000ca88.bin
1ca90de6f33450090734d2cac94c3bb508c4a8929be20d9ac91c8fbebb9c01a9
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA88 14196 bytes
font_02_sfnt_off0000ee00.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE00 16792 bytes