Malicious PDF — malware analysis report

Static analysis result for SHA-256 03e5d92c2aca3280…

MALICIOUS

PDF

87.6 KB Created: 2021-08-28 19:23:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 752071b8687607cf8bc97341df017580 SHA-1: 1858019771a19624c7cf0a51311e748e7fcb2fab SHA-256: 03e5d92c2aca328095835728d3a0d8b72898d8aea2f1f5bfa167cc9327267395
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. Heuristics indicate it functions as a link farm, directing users to compromised CMS uploads and disposable hosting, likely to distribute further malware or phish for credentials. The embedded URLs and the nature of the link farm strongly suggest an intent to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/42160277096.pdf In PDF document text
    • https://jasz-pap.hu/UserFiles/file/vetujabezebutebule.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name//files/ritifi.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/salofonarapuke.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/4550947915.pdfIn PDF document text
    • https://lotteppta.net/beta/assets/file/lugijebavalogotawobanumi.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/627a716a2c29112a8e10feb395e0c59f/18292871055.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/kokivusizujubulef.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/93281750962.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/fosimukewig.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160800a163c035---xekiwopukiwolokumi.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/fosiwigonewuwumiw.pdfIn PDF document text
    • http://peoriamayorprayerevent.com/clients/1/16/166e3f524b51ec168ebfd48f86188a1d/File/ragolilinubofusiv.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/7qlb7eov66n5ld6i62kpj7ifql/77545490748.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/togufujinekifasidap.pdfIn PDF document text
    • http://0851gay.org/userfiles/202106file/2021062111280470554.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/7098120682.pdfIn PDF document text
    • http://sakulchaiplace.com/Uploads/file/xowigafusufunetowikalita.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/58347596186.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16094395f41467---masopirizivoguditelam.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/99957535309.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/kivelokunajirosax.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/ratuxuwegonajofigu.pdfIn PDF document text
    • http://recviem.ru/img/upload/xuzoritilago.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=the+invisible+man+adrianPDF 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_off0000f15e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15E 17868 bytes
SHA-256: 59dc0d9ee18638bd3b02fce06677b893151b3c57827c6d614ddfb1c2abc103e0
font_01_sfnt_off00011fcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FCD 10464 bytes
SHA-256: 9b1fe747a1f5b8f678ba841191e2be6729635c960efc16aa9b3713c33e6fb326
font_02_sfnt_off0001374a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1374A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1