Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5a30a022181d748…

MALICIOUS

PDF

68.7 KB Created: 2021-10-01 13:20:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1b20570c39a05a89e38673b12e9e9b68 SHA-1: cfc82619c637a8ae6d0610b685d52280c3d8b705 SHA-256: c5a30a022181d7481837b0c53cbf236c3ae78c856a4dab217f7a2c641767038d
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of numerous unknown reputation URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://ibtaker.ps/userfiles/file/kukal.pdf In PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/78559567046.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161412e8099df2---xidoji.pdfIn PDF document text
    • http://directopinion.biz/uploads/FCK_files/file/zepodasutuxuji.pdfIn PDF document text
    • http://rimini-portal.de/bilderarchiv/file/ponux.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/xogaref.pdfIn PDF document text
    • http://2rent.gr/userfiles/file/99726404685.pdfIn PDF document text
    • https://vzglavniki.net/data/file/moket.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/161447999c4fde---wojukibodiwe.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/92152443934.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/89509940844.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a3f6d2c96---67344542733.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/161568b8483c3c---kevebofemurenuzotub.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/nixiwebonixaranor.pdfIn PDF document text
    • http://sjanzee.nl/file/87339250032.pdfIn PDF document text
    • https://indiansecuritisation.com/ckfinder/userfiles/files/57236194222.pdfIn PDF document text
    • https://atavio.ru/files/file/bovinepaxezeputaxu.pdfIn PDF document text
    • https://verticala.ro/images/userfiles/17806047321.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/nozazakinuxijofejadozup.pdfIn PDF document text
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/vewodavurarojejosenurum.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/ded9aa08bcfb7997500991b93d6e9a2f/75523697131.pdfIn PDF document text
    • http://cdenito.net/userfiles/file/pusofonopaxiralire.pdfIn PDF document text
    • https://alohasafaris.com/files/31153655146.pdfIn PDF document text
    • http://aquatherm-graz.at/files/nivijipetogugeseratat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=app+store+and+androidPDF 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_off0000afdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFDC 10320 bytes
SHA-256: 934ee9a250eb5cf70aa722f0222f9064101f7a0e137751ca11f8462366977bb5
font_01_sfnt_off0000c747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC747 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000df59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF59 15332 bytes
SHA-256: ebf85c8282ef2caeee4717990b385123872728d946b0aecc0d327f32b2085b2d

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