Malicious PDF — malware analysis report

Static analysis result for SHA-256 f53f38a9312d48ef…

MALICIOUS

PDF

74.0 KB Created: 2021-09-18 06:33:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2c10f548a109459491a5b7a027a46ec5 SHA-1: a6301baafc9f23ab8084452cb199cddbf96cc57a SHA-256: f53f38a9312d48efaa1a2cd97a6fa11125121393e218c925cfd49c257f6072e0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users. The presence of numerous external URIs, including links to compromised CMS uploads and disposable hosting, strongly suggests a phishing or malware distribution attempt. ClamAV detection and ML classification further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://proartgaleria.hu/files/files/69375335342.pdf In PDF document text
    • http://mybed.tw/uploads/files/202109152305423975.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/98039796396.pdfIn PDF document text
    • http://njxinbell.com/upload/files/tumelilazezatopumer.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/sijipitulobanevuf.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/faxorevelogubinolupim.pdfIn PDF document text
    • http://shevtsov-art.com/uploads/files/fexuxepivulo.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/kozobizexafetezipuwu.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/kuzelajunozawisazililoru.pdfIn PDF document text
    • http://oawebserver.com/piceditor/file/2273779732.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/68390743694.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/137j6u7h899kn0i7fjgsh758tj/merosix.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16136938dc2e37---67433232579.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613a92a4863e7---83815511927.pdfIn PDF document text
    • http://strandedtattoo.net/file/zulometidazad.pdfIn PDF document text
    • http://fabriquetextil.com/js/new/fckeditor/userfiles/file/mitadojavunasif.pdfIn PDF document text
    • http://aasghsflqsae.handylover.com/upload/files/40360384616.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/wuxulotifavarom.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/vagabajedosugadirodusaf.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ae209fb14---22036587798.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/6902789816.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/xamewomawodipapatijagug.pdfIn PDF document text
    • http://jjc-dev.com/userfiles/file/61610785525.pdfIn PDF document text
    • http://transporteslaplata.com/imagenes_web/file/gomivopitokik.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/74e6ff18862ba205bf956f45a53005d9/xoliwasikofulovozet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=getting+started+with+spring+framework+4th+edition+pdfPDF 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_off0000b98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB98A 17560 bytes
SHA-256: 66cd30a89beed07b5acf42d4dbba3dad4bd8ce6c8ab218a3cfc8bf6c6e399220
font_01_sfnt_off0000e78e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA5 11196 bytes
SHA-256: 63d26734888ebdfeba0496c5d98ca99b92e7f8445328469a6988f16cd13653dd

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