Malicious PDF — malware analysis report

Static analysis result for SHA-256 97ef342a89b1163a…

MALICIOUS

PDF

83.9 KB Created: 2021-10-08 13:06:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 5c042f510bd49ff2dc96252f448b6690 SHA-1: 75dbb3b26b4165f9389a8d9f2f4ec8ca2b31ca8d SHA-256: 97ef342a89b1163aa9f7ead33a8e0ac8cbc0c34ba0dad0ad85a3ea7af5c3298a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and a link farm pointing to multiple external URLs, some hosted on compromised CMS platforms. The primary function appears to be redirecting users to potentially malicious or phishing sites, indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://iieng.org/editor/ckfinder/userfiles/files/garonawuretilibozij.pdf In PDF document text
    • http://ankaraeksioglu.com/resimler/files/gezokebonaf.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/xazewapivixoxadakapu.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/23299754764.pdfIn PDF document text
    • http://dhf-china.com/d/files/samudoloponolakakug.pdfIn PDF document text
    • http://aibrpjoaae2.specialty-match.com/upload/files/37716089174.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/67868707064.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/c1263572ffc74dd361184375c1ff85e7/kemasuxodewolemapupugoti.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-24/images/files/dowofopozonuzegofalemewiz.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/39335965700.pdfIn PDF document text
    • https://vanha.kokkolansuunnistajat.fi/ckfinder/userfiles/files/povorefepebofuzizir.pdfIn PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/pofeluxafatowafoxafa.pdfIn PDF document text
    • https://tele-video.ru/upload/files/98612580328.pdfIn PDF document text
    • http://anpo.vn/upload/files/15722707582.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/junasetuworig.pdfIn PDF document text
    • http://kaiyudachem.com/filespath/files/20211004060636.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/jovob.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/pagoliwebefowipod.pdfIn PDF document text
    • http://hk888.edo2008.com/com/comimg/file/20211008_161859_180.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613969aebd0cd---26045394371.pdfIn PDF document text
    • http://yongchengtech.com/uploads/files/202109191946465895.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1615d1f280c44f---74852780658.pdfIn PDF document text
    • https://digireg.li/upload/xilusegimasemuli.pdfIn PDF document text
    • https://digireg.pl/upload/meximuxijosuvikumeboka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=the+new+dogPDF 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_off0000eb85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB85 9912 bytes
SHA-256: 4cfcc40d7911e98420ef007f08b7a72b29a27ba61e4dc7ec49927d4bfd60e91a
font_01_sfnt_off0001011d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011D 16216 bytes
SHA-256: 0c4392cf11e5fd4df502ea5b8e6b162742692d1690f1d796f3875351b05c3077
font_02_sfnt_off00012a9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1