Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a364f6c23ea8b2d…

MALICIOUS

PDF

77.4 KB Created: 2021-09-23 06:07:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 34bb39e9ee32ed06cf8c4ba6a1ded428 SHA-1: f98c4cb8fdf76f53df1f077fe8c815413d65e776 SHA-256: 6a364f6c23ea8b2df07700af299d4c5b179310c35cdedeffaa84acc75cf0f4a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious and by an ML classifier with high confidence. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the overall structure indicate an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=kimetsu+no+yaiba+the+mugen+train
    • https://predial-rua-nova.pt/056-CovadaLua/images-editor/file/18395682831.pdf
    • http://eiak.org/upload/editor/files/35485727858.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e425060a43---75213435228.pdf
    • http://4rrecycle.com/files/file/rufixemomoxifofikotapas.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/8196bb4573e72ce90b36354d117c92f7/novidekuxexilo.pdf
    • http://studiopassarotti.it/userfiles/files/98358935570.pdf
    • http://cravaluos.com/ckfinder/userfiles/files/zagapixuxolelomosaxufem.pdf
    • http://baltyk.recykling-rejs.pl/imgturysta/files/diluj.pdf
    • https://leganordavigliana.it/uploads/file/96169285838.pdf
    • http://bannermaul.com/userData/board/file/lebetutotim.pdf
    • https://eminenceconstruction.ca/viking1/uploads/files/dajakoramasevugix.pdf
    • http://kaies.cn/upfiles/210916004133765148tenu7c.pdf
    • http://faptvmedia.com/userfiles/file/fejibelukiboripujawonidud.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f15b95d2e8---54594919345.pdf
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/rexogopoxum.pdf
    • http://ckm-machinery.com/userfiles/files/44556771499.pdf
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/18092007607.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/4c7ae7fee87c589ef84ca7d73d398cf3/daxafujuvoravixasiroxexi.pdf
    • https://casaalu.com/luutru/files/linomomig.pdf
    • http://alrabbancapital.com/file/files/pimazuwisotomurozafak.pdf
    • https://yp05.com/_UploadFile/Images/file/bozabamusi.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613c99549144a---niluxakiveminomoran.pdf
    • http://www.florentmaussion.net/userfiles/File/xurumukilakawon.pdf
    • https://mysmartedu.com/uploadimages/files/27024913193.pdf
    • http://stilistspb.online/public/files/uploads/files/dajilukosizofopuzexugamo.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_off0000c43a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC43A 16792 bytes
font_01_sfnt_off0000dc4c.bin
ba604ce785a73425b54e2db7accb0f61b5b794d1c60ca96d0e16eb26ba759963
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4C 19104 bytes
font_02_sfnt_off00010ddd.bin
4c676da90295002f7ce4bab71a60b12b7cc1345be408bf703dbc0988f76f9201
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDD 10852 bytes