Malicious PDF — malware analysis report

Static analysis result for SHA-256 36f490163cc7613c…

MALICIOUS

PDF

102.9 KB Created: 2021-08-03 14:53:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 07e8c605584be3bbbb94188930a3acd1 SHA-1: 8326e3194a9fcead2b0322195ffab215a8eced6d SHA-256: 36f490163cc7613ceb2d697c6217981367464c4e4c93cd80e94e90dec0ad60f3
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by an ML classifier as malicious. It contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting an attempt at SEO poisoning or distributing malicious content. The presence of embedded URLs and the nature of the link farm indicate a likely intent to redirect users to malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/fosorozaxogevupena.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbfb84435b---kukeviwir.pdf
    • https://ptogel2.com/contents//files/wororafedokal.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ca71c2d9d0a---kadopodirug.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/69e04a3fa5d4e22b6481cfa2070b3f60/lexajedokebekesixex.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/7121cac4d02dab9516fb0678158c9548/zipasitoxuwiwogar.pdf
    • http://botosani.ro/img/uploads/file/1753448014.pdf
    • https://vildmarksjagt.dk/userfiles/file/62676275123.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103df5831518---3603945659.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a1683c31218---99753714766.pdf
    • http://samuiluxurytravel.com/Uploads/file/wuvirutik.pdf
    • http://webhenevents.com/clients/868374/File/dimijuzelotipo.pdf
    • http://apcmagon.com/userfiles/32950364402.pdf
    • http://xoblates.com/clients/e/e0/e08cfb93fb97b00c28394d0532709dc9/File/79539425114.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d056797f8---86883786704.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b8384bcd5---70625977771.pdf
    • http://hb1004.com/userData/board/file/90801473591.pdf
    • https://paradigma.bg/uf/file/84140017839.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ac08jaueqnk81v8q2790brru64/nonajojizagagolor.pdf
    • http://gleneaglehoa.org/images/file/14902664246.pdf
    • http://kamerton.nl/clientfiles/56589266313.pdf
    • https://f27szerviz.hu/upload/files/lasisobigavatasi.pdf
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/3nkkhhurnrb743jc22mtgo0gs4/58630560038.pdf
    • http://brilsports.ro/userfiles/file///82968825846.pdf
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/1734633fff7ae0ce593011262ec0c27d/denilazum.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+overcome+price+objections+in+sales
    • 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_off00012a8e.bin
4a6fb1aa510b13d8362f3ed76a9334ef1f0a4af4910135defa13004b14286ead
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A8E 18140 bytes
font_01_sfnt_off000159d3.bin
48127b234fcc16ebaf91e5ac3e86620209b75f78b7e7f4f4cc7a8d26b2a3cc8c
pdf-font-stream PDF embedded font (sfnt) at offset 0x159D3 10948 bytes
font_02_sfnt_off000172f3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x172F3 16792 bytes