Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e2f603c7ffe1558…

MALICIOUS

PDF

101.1 KB Created: 2021-07-17 13:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9b607377dc593665b79e27b9f08fbb46 SHA-1: 94ccdff9c70476fec842b84531a0d271079fba2d SHA-256: 9e2f603c7ffe155856c5a738007199e2a1bdd986d259db3fbbb96649246640da
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to manipulate search engine results or distribute malicious content. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9787

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://rieker-consulting.eu/files/file/rinubobepegidesovil.pdf
    • http://ainut.fi/userfiles/file/78046619021.pdf
    • http://aokisuper.com/ckfinder/userfiles/files/xowakozuxij.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/89c712563682c61dbac0cbc77594bdf4/wokurarebaxevado.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac010d0841---fobeletujaxigiviz.pdf
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/og351qv1p6fvjlsm5dlcepjui3/48531390217.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4f3699880---4307592000.pdf
    • https://frontivo.ro/userfiles/file/bipagonilixaxikeliteperol.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/mconqsitshiuihos4osrm7t4nq/xulowekexi.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607e914184e9a---dukagagexizivunidumav.pdf
    • http://veraschwemmle.de/fckdata/file/sakawi.pdf
    • http://dok-vo.ru/userfiles/file/melegazovagimuzizitipur.pdf
    • http://digifast.cz/userfiles/xegarabomorumepotusofepul.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ead6bf3d2---luvogex.pdf
    • http://longarmacademy.net/fckeditor/userfiles/file/38939159729.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e0affb4d643---zavavudosekumijopi.pdf
    • https://mimpishio1bet.com/contents//files/21680244063.pdf
    • https://cihangirhotel.com/upload/ckfinder/files/zoludotomikepekinati.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/5d6d63a68a453442d09c5abbc74bf59e/15914771869.pdf
    • https://ajur.rest/uploads/userfiles/file/lojijetaveberox.pdf
    • http://nceed.kr/pds/userfiles/files/9496321418.pdf
    • https://srldirect.com/ckfinder/userfiles/files/lewerowomufipibatilabu.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/080ea848aa9718982193a9924abb389f/xopijeronuzemadelefo.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608cdd3111414---71161012603.pdf
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/edp2ol6r6875fj607243tvcfu4/pedafejan.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e056b09a9c---suwinunoliru.pdf
    • http://fresh-j.info/images/uploadedimages/file/lazepemodawaj.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+get+frieza+as+a+mentor+xenoverse+2
    • 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_off00012678.bin
fbbea1f356dc15ba856a9c2b5a14b8ec3252808cb0de6ba2d6901bf1c6af5ce5
pdf-font-stream PDF embedded font (sfnt) at offset 0x12678 10936 bytes
font_01_sfnt_off00013ff3.bin
cda3e3fc08a6a79b7245a49c83757faa537a4bbf4481022dab69994007360031
pdf-font-stream PDF embedded font (sfnt) at offset 0x13FF3 17840 bytes
font_02_sfnt_off00016ec9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16EC9 16792 bytes