Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aac1e732dba2d25…

MALICIOUS

PDF

84.8 KB Created: 2021-09-09 22:26:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e18581d23d71e8f58e5e192569d09869 SHA-1: b983eb9f4e1bf9eae9969127824f8fdf4a95ad6f SHA-256: 1aac1e732dba2d25dc9ae4a30fcd8bcda54207e3ec72dc7bc743c2e33e464bca
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to disposable domains or compromised WordPress sites, indicating a link farm designed to redirect users. The presence of embedded JavaScript and a ClamAV detection for 'Pdf.Phishing.Trojan' strongly suggests malicious intent, likely for phishing or malware delivery. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://jamurgoreng.net/contents/files/gunepemunoromupiginob.pdf In PDF document text
    • https://sangolongphuong.vn/longphuong/news/files/17119023113.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/faxijibetujuv.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/7c44715af4ee28c9c6911bdd473f8221/gogejisejalonademexuvujan.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/tazasofizun.pdfIn PDF document text
    • http://didula.ru/img/file/pejukirinaronoguso.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139bb2b1abc0---38760387714.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/23703257567.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/028b670bc0cdede6e8a4f10ad14f4456/27093706780.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/51941898008.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/telirewejiwugibamuturif.pdfIn PDF document text
    • https://oreopay58.com/ckfinder/userfiles/files/30903728191.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/voponenaxujofikoxosega.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/japeboled.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/34897210136.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/neguveniwubukavasituza.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/89506989750.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/pupevadasadapobawafobuno.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/74538610258.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/valoruverute.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/30577926733.pdfIn PDF document text
    • http://rintoyo.com/userfiles/file/lofejunepeko.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/93229275005.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/vexitivi.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/98463696470.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139dac84e945---tolobuwidawariwesodaz.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/45199231545.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=android+get+screen+orientationPDF 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_off0000e67a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67A 18364 bytes
SHA-256: ee9a4b8cd1854f6e8d97c58ab8bf2581cc91598035abbb194e4bb7c226f614a6
font_01_sfnt_off00011555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11555 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D6C 10480 bytes
SHA-256: 78080deba3d10721e03ec2092fa5a820ff3123e45e45778c8364e2524619ecd7

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