Malicious PDF — malware analysis report

Static analysis result for SHA-256 00eb8ab191496753…

MALICIOUS

PDF

68.8 KB Created: 2021-09-24 23:50:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 322395e0b28a871eb096187c86c21e18 SHA-1: 69914bc9c4113786c756a7d9b989f6c40b95a152 SHA-256: 00eb8ab19149675394d219f80e7cd9858d47a922bbe4bb6c22db185d44e2cc8b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to various URLs, some of which are hosted on compromised WordPress sites. The presence of multiple links, including one with a 'utm_term' parameter suggesting a lure for 'the room apk download', points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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 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://penmypoem.com/new/admin/uploadfiles/file/nesipawodarosabe.pdf In PDF document text
    • http://gidaero.com/upload/fckeditor/file/tezesapifobinebafufa.pdfIn PDF document text
    • http://naphogacomposite.com/upload/files/31049696762.pdfIn PDF document text
    • http://rklatex.com/userfiles/file/kebik.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///45470602570.pdfIn PDF document text
    • http://www.moyekolodin.com/files/fasufizorobodiparupulu.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/pijuxulovul.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c8219a567---deloraropaxeninijag.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/94984698653.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/69183252275.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/4555598998.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/90910665171.pdfIn PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/6757256645.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149a019713cc---18048501032.pdfIn PDF document text
    • http://harckocsik.hu/userfiles/file/vobulogosepiku.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/32305648774.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/riwawalinivukilezikemu.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/73233370471.pdfIn PDF document text
    • http://ntep2008.com/UserFiles/File/lifisipevinusufogogegolel.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148e2ac3520c---61752589777.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/furojemimojivomezi.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/notevobalejuf.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/79514038936.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=the+room+apk+downloadPDF 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_off0000af0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF0B 10440 bytes
SHA-256: 660ec5a83ca2661c8d0cb9b5d22350f7e41934e811191dbded68566bf2676501
font_01_sfnt_off0000c68c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC68C 15764 bytes
SHA-256: e3689c357bad5e39226f49d7a151704c274af60a8d2ea557f8232b08e77397e5
font_02_sfnt_off0000edda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1