Malicious PDF — malware analysis report

Static analysis result for SHA-256 41e52ab38c297894…

MALICIOUS

PDF

81.4 KB Created: 2021-09-14 01:05:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: af6d158386c846a2bcebb0805399939e SHA-1: e8f92f3b73113a79d1f5e4d97a44ece3964c8e50 SHA-256: 41e52ab38c297894ff0ad4d6f23e6c474984e4e3af2e26712e0286d88080b750
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many of which point to compromised WordPress uploads or disposable hosting. This suggests the document is designed as a link farm to redirect users to malicious content, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://menifee.hanasushichoice.com/uploads/files/41866549565.pdf In PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/foxawevevoponisibu.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/98882176632.pdfIn PDF document text
    • https://beeshark.ro/app/webroot/files/userfiles/files/wurel.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/96021277543.pdfIn PDF document text
    • http://mertcelikkapi.com/userfiles/file/23011744934.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/poluluvivemaselofuzagubi.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/72726163149.pdfIn PDF document text
    • http://erimti.com/userfiles/file/35617955627.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/161316a31160da---3089935105.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/77670181812.pdfIn PDF document text
    • https://littleedupark.com/ckfinder/userfiles/files/47648448071.pdfIn PDF document text
    • http://hoaphathotel.com/luutru/files/zaremoxapamopoxokize.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f35fd606e4---rusuveken.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613976f31ce42---pixosavoredawuwirifuxa.pdfIn PDF document text
    • http://atomleasing.ru/media/File/7526903108.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/tanefibanedixobo.pdfIn PDF document text
    • http://medwin.kr/userData/board/file/80379732860.pdfIn PDF document text
    • http://anpharma.net/upload/files/93736408565.pdfIn PDF document text
    • http://unseretochter.ch/images/file/kikuputedimaxev.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/6977932784.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/rarupupivikabusad.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/1438462047.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/93997227479.pdfIn PDF document text
    • http://uslugi-ogrodnicze.pl/pliki/File/waridewazinojad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=best+free+football+streamsPDF 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_off0000dc93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC93 16940 bytes
SHA-256: 9306ec91baec55a121cb437dce9588e70ff7f3feb1efa7f7a8156457010519a0
font_01_sfnt_off0001087b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12092 10372 bytes
SHA-256: f5f326f6c86327eb386ff05b583e2de7251355ae9ba4e7b718c0efb00a284e4b