Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1c03d2038d70d34…

MALICIOUS

PDF

88.2 KB Created: 2021-07-04 00:47:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 157b82ad1ab136f080c55033ebb4db43 SHA-1: 7f8927aaa4c8ef8707c8f06b5f7d76dda0805b58 SHA-256: a1c03d2038d70d34359c445ab56af54aee68fc54ecef2cd17726d0a1738d94c1
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely exploits a vulnerability or serves malicious content. The document functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting, suggesting an attempt to manipulate search engine rankings or redirect users to phishing sites. The presence of multiple links on compromised CMS upload storage further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://arcenevents.nl/site/upload/files/zixamudujanigejijewijazev.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160731a570cdb0---xozusopafojifudo.pdf
    • http://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/56869565446.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a06da16bd9---22171865243.pdf
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/xakujedisuzebuxomome.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/56f845209b3cd50ca3a88d0763f96f06/weminezasupaf.pdf
    • http://hyunbulsa.org/~ewedd2/userfiles/file/sedesinisonaxafapoxedur.pdf
    • http://hocikto.info/userfiles/file/xopiravonebilet.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b72ca7115ee---29244174305.pdf
    • http://infinijewelry.com/userfiles/file/8074702209.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/c9fec7dacead74261c4bc0c8404a39ba/53404587599.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7deab3ce8---58529346029.pdf
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/jnpa91u4bsmhep48g10gavr72p/difuvasemoruvuwo.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b04fffa8e37---14876373954.pdf
    • http://videofilm-tv.ru/content/File/dokigejiwarinixus.pdf
    • https://europartner2.pl/uploads/dadinike.pdf
    • http://hnc2.com/userfiles/file/puvalutezalawinus.pdf
    • http://ebsenglish.net/_UploadFile/Images/file/juvatisuvoworu.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7586cefc3---3334441355.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b9bc0ee7a1d---64489868715.pdf
    • http://adveotec.com/img/file/topipuvimin.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c7187ce57---sevitadalupak.pdf
    • http://aftckwt.com/uploads/file/88968272750.pdf
    • http://boeschfamilytravels.com/clients/43210/File/nigigowaxipafutorero.pdf
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/t2neb0desdd2dnt3bpoggu5fso/fufelunaxikegorivumeno.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+find+cf+in+grouped+data
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/6739471f602cca8b11eaa82d126b9abf/88388768619.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_off0000f4dc.bin
f3d4f719cfc96e00f0312e0c9176b241d21f9f8cbc2bea104cb07c5f6627695b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DC 10756 bytes
font_01_sfnt_off00010d84.bin
d5341637b73ec3150453d41ab0a4ba14e66bd7c1498d89e3c519bd3568c9f2f4
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D84 17420 bytes
font_02_sfnt_off00013b4b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B4B 16792 bytes