Malicious PDF — malware analysis report

Static analysis result for SHA-256 96d8f68a4731dcf1…

MALICIOUS

PDF

95.9 KB Created: 2021-09-09 09:08:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 74f26174484bd535f0a6057028af2382 SHA-1: 55348fde5ca8ba7c30f7f1b8fd08d195e53715d4 SHA-256: 96d8f68a4731dcf1062db8000c3481e1d6feace35080390ceef246c35d5a32c7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to various URLs, some of which are hosted on compromised WordPress sites, suggesting an attempt to lure users to malicious destinations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/1f8c2e2c7c95f656b6035568f0774f73/22544274417.pdf In PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/85233035914.pdfIn PDF document text
    • http://debsecond.net/UserFiles/File/kasituravutino.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/pepemi.pdfIn PDF document text
    • https://grnca.org/img/files/files/67663292125.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/tipebipadobipime.pdfIn PDF document text
    • http://royal-pizza.eu/files/file/xiximadidigonupen.pdfIn PDF document text
    • http://satunatc.ac.th/ckfinder/userfiles/files/71989853739.pdfIn PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/94810353007.pdfIn PDF document text
    • https://hoongnau.com/upload/files/92446548600.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/juwelaxuseri.pdfIn PDF document text
    • https://milosislandrooms.gr/userfiles/file/2476070736.pdfIn PDF document text
    • http://xsteelstock.com/d/files/17376120591.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/95477198796.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/82845025755.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/sinuzon.pdfIn PDF document text
    • https://eurosan.pl/user_images/file/gobukurino.pdfIn PDF document text
    • https://swapnauraan.com/ckfinder/userfiles/files/96880641376.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0ba5f1dae---84906538818.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/vakudajitisedizaf.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/kesivexamosejavu.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613518884058c---vabureguwa.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/dcc9ea2f2f7bdd4ca931f1858dc2ef68/97189515059.pdfIn PDF document text
    • http://pyhunlian.com/uploadfile/file/piwisabuzuzawafofojib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=test+del+arbol+pdfPDF link annotation
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/semetoxepawirajamexopixe.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_off00011147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11147 18764 bytes
SHA-256: cd771649cedd883c19d474257ef0a5ab4173dcf52deef294033b804b5016dc6b
font_01_sfnt_off0001429c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1429C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015ab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AB3 10400 bytes
SHA-256: 42ae87815205f94503d2ecaa2faf7d5c5441d536374d3e621a60a05d75b8662c

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