Malicious PDF — malware analysis report

Static analysis result for SHA-256 30cbefe9c38a927d…

MALICIOUS

PDF

80.6 KB Created: 2021-09-18 23:44:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 45d409d60216f993d7c7801364228b31 SHA-1: 4079a8b17c1634d9f5a8890fb710e6b4a0ebb48d SHA-256: 30cbefe9c38a927d1f8105b951b9012445a359f326d8e979e890442ce97931c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to compromised CMS uploads and disposable hosting domains. These links are likely intended to lure users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • 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://rent-1.es/ckfinder/userfiles/files/kazipesogugi.pdf In PDF document text
    • https://anandamsanyal.com/userfiles/file/54769839520.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140019c601c9---davig.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/47881319376.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/vuduxuxetimusixol.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/33619591656.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161436e3c0df5d---mukuparopese.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612f95c063a44---71668742227.pdfIn PDF document text
    • https://tresonance.org/uploadfiles/kesatonufikoledosusetazer.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/35584902512.pdfIn PDF document text
    • https://webhosting4.net/media/file/84173866862.pdfIn PDF document text
    • http://ippon.lv/uploads/File/suzadizidefojepidatuval.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/7vot4l9ke28a4s1br1srkun6g2/63981835862.pdfIn PDF document text
    • http://xn--80aguejfegacgj0ad.xn--p1ai/pict/file/xudenera.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c31e7ee979---43426173714.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/pigitere.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/22702958450.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/46f285189dfbee7f128ac784f8f45ebb/norozoxunul.pdfIn PDF document text
    • http://gfk-schwimmbad.de/i/File/79885790954.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/zufolebegifuveb.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/zewubufupomiloku.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/80780328341.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/pagofop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=star+wars+tcs+apkPDF 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_off0000d724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD724 18432 bytes
SHA-256: 08730354c10ac3e0b723800cc123c8d724ab5f8e233cc3db44fc2cdd5f262cce
font_01_sfnt_off000106a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A4 10124 bytes
SHA-256: 74d7934653a5d55231f26d22d419873a3b791da4283d28ed06047ec6ea2ecb79
font_02_sfnt_off00011d78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1