Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc00336b2be905f1…

MALICIOUS

PDF

77.8 KB Created: 2021-09-19 13:02:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 5aa724eee70e56cdbecf569c132dea67 SHA-1: ff2001258e1fbd85f4d9334c1fffa8e2619fe980 SHA-256: fc00336b2be905f1fed9971c25433bf265e4c694835ba7551b8dd501a6f3681b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://ketchas.ru/uplcv?utm_term=mxq+pro+4k+no+internet+connection PDF link annotation
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16140792751078---sewixusopetubezapafufi.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/labulumavi.pdfIn PDF document text
    • http://dgjst.com/upfile/file/zatularekalurir.pdfIn PDF document text
    • http://itcck.org/upload/editor/file/faxurimililokolix.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/38983674361.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/nodaralijulifil.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/89863931061.pdfIn PDF document text
    • http://meyanko.com/userfiles/file///rudefekarifa.pdfIn PDF document text
    • http://vnndt.com/Images_upload/files/nudovepuw.pdfIn PDF document text
    • http://thuaphatlailongthanh.vn/upload/contentFile/minhchau/file/gumitibisonegidefuvit.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/69233267064.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/mapomujixuferebubogi.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f046cc1019---dinuxilozegevemivuwojami.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/lagiko.pdfIn PDF document text
    • https://drosamahetta.com/userfiles/file/sepunozegaburedovif.pdfIn PDF document text
    • http://vagyonvedelemszolnok.hu/admin/fck_upload/file/63412480420.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/13006016398.pdfIn PDF document text
    • https://limsurempat.com/contents/files/14950035985.pdfIn PDF document text
    • https://profm.hu/files/file/suwurivisefepukenazug.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/73410340152.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f05c064191---12495521363.pdfIn PDF document text
    • https://edex.co/userfiles/files/bewilijo.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413359892e6---tidisotejera.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/zaxisemujimepujalitu.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/zemalopogosa.pdfIn PDF document text
    • 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_off0000ca3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA3F 10400 bytes
SHA-256: a4982d6003fdc800acb11052df94e651a9fbd731c953f1fa502ba8aff4c20ab6
font_01_sfnt_off0000e1ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EC 18632 bytes
SHA-256: 925097a0bb2a13b9983172e3b62a4f9a81ae995ab3603a5eea06184801ae6293
font_02_sfnt_off00011139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11139 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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