Malicious PDF — malware analysis report

Static analysis result for SHA-256 4769aa87bafb1afe…

MALICIOUS

PDF

82.0 KB Created: 2021-09-17 04:19:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 118a8ba1b4a31fc4413cd2de274bc428 SHA-1: 11980c316469c881eaf846a5323ae126eddf3876 SHA-256: 4769aa87bafb1afec9a8b6b36043e4be0d17dbbc3a48a42ab9b621ed5dddb19d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple distinct hosts, many of which are associated with compromised WordPress installations or disposable hosting, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa6f5893e2---70304659200.pdf In PDF document text
    • http://mevlanaasm.com/resimler/files/gusazemotawepeguzixutef.pdfIn PDF document text
    • https://sealskinz.ru/files/file/14067057123.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/rogogifudolaganafeg.pdfIn PDF document text
    • https://profession-your-dr.com/uploads/files/202109161618584012.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/vifadojibuwurogigonelis.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/71814570488.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/0e98ae949853bab5a73ff5b0fd696b34/ralujenaxazivarebuko.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/dfd90f09faa88ae5ccad56b745683981/54287536217.pdfIn PDF document text
    • http://thietbiytedaibao.com/media/files/sopesakeguzida.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/88790077048.pdfIn PDF document text
    • http://thangmayedex.com/webroot/img/files/3772741123.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/51950198693.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a922f41788---pipunutofanixil.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/90991865882.pdfIn PDF document text
    • https://topupdana.com/contents/files/65906912122.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fee7a3bfc---lozalit.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/vaxesowalasudezifexaruvus.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/teravivinugejirima.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/nuvidutiporuwatexodagasa.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/38492187161.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/24442385675.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210906231842.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/42526546803.pdfIn PDF document text
    • https://service-panev.com/userfiles/27107884796.pdfIn PDF document text
    • http://jfe.hk/userfiles/mudafaxurivabizijovawev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=nba+android+tvPDF 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_off0000dd71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD71 10080 bytes
SHA-256: f6f3c0499be25b36c890fd2e5586b71e0aacb035f1ff8c204027aef3a1513f9d
font_01_sfnt_off0000f3f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F5 17840 bytes
SHA-256: e5ed9bfeba325e7ccffe18ff7a79d8c740adf166d0d48eeea94911c392ce63d9
font_02_sfnt_off00012275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12275 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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