Malicious PDF — malware analysis report

Static analysis result for SHA-256 aca103ad296cff57…

MALICIOUS

PDF

87.7 KB Created: 2021-07-07 01:10:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6cba57af27cab1cc6ba3a6151391e38c SHA-1: 59070125e76f0eb43916a77b676de224079f882a SHA-256: aca103ad296cff57ce7e63476cd14a358386e1d4e18243b855f5bcf117e640e8
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains. These links likely serve as a distribution point for phishing content or further malware.

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 https://smidgel.ru/uplcv?utm_term=the+road+to+winter+summary PDF link annotation
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/04677f6932493a12998bb87f89c68710/23326891633.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/3f1dfec338fde0b9fddf0295e37e1322/61000252159.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/53302948281.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/30403294973.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/69999892110.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/sanofuwugifepufivin.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609837b34cd58---84858691333.pdfIn PDF document text
    • http://chetaomaynganhnhua.com/uploads/files/neleg.pdfIn PDF document text
    • http://klpa.net/userData/board/file/37004436809.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798b13a9351---refowovi.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/d940ef04137d3a0169657e9aa3cd5ffc/wudemo.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/de6f64450a1963b6f9770b0edcb44383/bosalirodan.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160bc01aa68c1f---movagotifasasuwim.pdfIn PDF document text
    • http://wernitznigg.at/files/sowisobubixu.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/3730106d4ef216ad8a08507a95af3db9/xewinezudumigobiz.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aea8127ce4---72586992005.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e97a168fe5---vegekatolowosusimanurunes.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/25e8e2b5e8f86dcee0e4b2f7b7700ae4/simokafusepotuvife.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/bdf99082db2cc3179abcbdb3126bf10a/58484574597.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/tixujeti.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/0795cae639efb74be81fcd4f3a6fec91/28720967180.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/d79ff5c9e47031aeb059ad0297925e03/83146246680.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609058ac0453d---27780770361.pdfIn PDF document text
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/806ad622d97e8a23d379f2693c3b4568/52974015993.pdfIn PDF document text
    • http://covinahigh1980.com/clients/1/14/147ee80f0cf2e08ca1b5067d21485a43/File/2114822425.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab20c9ae84f---70889040712.pdfIn PDF document text
    • 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_off0000f149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF149 10728 bytes
SHA-256: a5a12bbd3b1031ca153a52b441f1b0dd11d96bf61dc0c609cdbfa3a3984f155a
font_01_sfnt_off000109da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DA 17588 bytes
SHA-256: 7dded1cbee289db80b7278e9dbb2fefbd48815471aaff173cda8a3765514212c
font_02_sfnt_off000137d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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