Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2b7a483964e24b3…

MALICIOUS

PDF

88.7 KB Created: 2021-08-03 05:12:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: ed3e887488e830c7e5d6430773cbafb2 SHA-1: ea540d4fce5a5bb3d4f2792df8839e8eb0826929 SHA-256: c2b7a483964e24b3b4ecb4a0fc143d382cea145bf3dc1c4393b0a2b4481961fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple compromised WordPress sites, likely intended to host malicious content or redirect users. Heuristics indicate a high likelihood of malicious intent, with ClamAV specifically identifying it as a phishing trojan. The presence of numerous distinct hosts and the use of 'utm_term' in one URL suggest an attempt to obscure the final destination and potentially leverage SEO tactics for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2eb760f2de---wazezasiba.pdf In PDF document text
    • http://weddingdiy.cc/uploadfiles/files/20210602_132552_9969.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160adc26a260f3---44948278197.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/nisukoraxuwizifisuj.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16079ad0d75a1e---pilogekodusapotaw.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae90d47c9c8---82352355316.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5bd83d228---68802315859.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/kukoderamuraxe.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c9595cb27---62967092752.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609571add186f---xuxirakufufitivesuvegodo.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/50814090117.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/dolesinaniwemikirafakozub.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/cova9j4sj09b0quag5citpqef7/jajatanapukexelew.pdfIn PDF document text
    • http://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/nemawo.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/0f7641c08fdd3133625007d90f699406/79556196466.pdfIn PDF document text
    • https://negaratoto.com/contents//files/64926878200.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/cbdc9efa77074824ee804b9ef87ea413/89931482388.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/sezepuke.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/zowasudagawudenudu.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/nesigodijadut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=libro+de+matem%C3%A1ticas+tercer+grado+de+secundaria+vol+2PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A9 17336 bytes
SHA-256: eafbc2b3306ae2dbed2e98b3ce6e60ed40d1caaed12a30ba877b37f8a25ca7e0
font_01_sfnt_off00011fa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000137bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137BD 11276 bytes
SHA-256: 6ae6582e81958b85ad847fdb20b8dde485c64af96aa6c4009c5ad4cb81c2d25c

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