Malicious PDF — malware analysis report

Static analysis result for SHA-256 e753b91609874000…

MALICIOUS

PDF

73.3 KB Created: 2021-09-28 01:51:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ffc18e419e0c5d8fe0c30af5d767edce SHA-1: d094816cae2a46b1edccf17a4801539b1eecaa97 SHA-256: e753b916098740004a52d1e35d4a1baf44ca76096a33342c07e6ac662f173d40
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are identified as link farms pointing to compromised CMS uploads or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery through these redirect links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://goldmustang.ru/files/files/7478733750.pdf In PDF document text
    • http://n2nnetworks.com/files/others/22052266107.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021941430511659.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/pepetiv.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16151bd8535e39---xafuritanita.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/9025312491.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/86472281273.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/80550566789.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/44253915315.pdfIn PDF document text
    • http://dolonchem.com/upload/files/luvusiluzogodoxozaruseboz.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/kojoremikez.pdfIn PDF document text
    • http://medi-sen.com/files/files/jenik.pdfIn PDF document text
    • http://trust-law-firm.com/userfiles/file/20210913152144_1662619621.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/7e411983d3532b7591360fecb7e65086/nalejiwavibafifuxa.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/talejivurudobuxebax.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/15045056026.pdfIn PDF document text
    • https://kimansion.com/uploads/file/jomametonukafamejupik.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/90295272837.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/70484771209.pdfIn PDF document text
    • https://otterdisplay.com/userfiles/file/56066448354.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612eea1e0c49f---xifivoduri.pdfIn PDF document text
    • https://cape-electronics.com/media/file/poruw.pdfIn PDF document text
    • https://sysyanginguvenlik.com/uploads/files/94237664963.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/migunusopazasinunif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=hd+mobile+movie+download+2020PDF 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_off0000b7a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7A2 18552 bytes
SHA-256: 4eebf155c067e02c294313d7983b42df7653539e1264b39a8988e689860ab18c
font_01_sfnt_off0000e70d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70D 10568 bytes
SHA-256: c0eeef41f1b72778bfaf6187e71a0cdc746a6220f4b1c523ba779bb5fdc11420
font_02_sfnt_off0000ff16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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