Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaa64f51b288dd0e…

MALICIOUS

PDF

83.3 KB Created: 2021-06-28 01:13:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2a055e937f43157d550ed877069701eb SHA-1: f0f6a1d09dd5297ca666475b8501be913ea7e0c7 SHA-256: aaa64f51b288dd0e650893e66e76ec7c0ba95daa6a079d1529f6872779da783c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external links, many pointing to compromised websites or disposable hosting, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://z-i-f.ru/userfiles/file/76143670112.pdf In PDF document text
    • http://www.anjhimayath.com/upload/file/kekosexax.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/9a67028a747fb944d801eddea76a8c43/dubipelepuwexisaxulikatet.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/48100861793.pdfIn PDF document text
    • https://rozgarnetwork.com/ckfinder/userfiles/files/31558929527.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/44874225537.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9939755157---fopej.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc4d9126dc---86405038128.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/af2e5acf74b30acf162795c774c1f335/64202460476.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5087a3bc9---23018149418.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e94d313797---zemopipejorakigema.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/2j4paplimm0gpeb466b4cebb0r/27370068834.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/ki0r5u5qh1sfu1flc9nthlbtuu/fegelibadanesof.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/1deu3gi2itba1vrrjfn56phcr3/2370550266.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/23607104160.pdfIn PDF document text
    • http://vetcarefoundation.org/userfiles/file/fetexanaxesetoti.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/21546050201.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f31d2a8074---8632748816.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/66644948027.pdfIn PDF document text
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/94323613630.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160865fc9ce09a---46592035348.pdfIn PDF document text
    • https://eingangrad.ch/userfiles/files/wifuxawuditefu.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/medova.pdfIn PDF document text
    • https://kovosluzba-praha.cz/res/file/25609174898.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/30240399605.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=science+and+technology+current+affairs+pdfPDF 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_off0000e2f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F6 11188 bytes
SHA-256: ed94daec48c7139ddd60a2e02716cf8350f58406678e949e256abbac57b29626
font_01_sfnt_off0000fcdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDF 16464 bytes
SHA-256: ddc53ee2c7928f87b6a4b08c22426c0a9d62eee7c60c84adc48716bf13e19071
font_02_sfnt_off000127a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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