Malicious PDF — malware analysis report

Static analysis result for SHA-256 d78d1a4f3bc06197…

MALICIOUS

PDF

82.4 KB Created: 2021-09-08 10:51:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 18fe9ec42b706d91a9f06ccedca10e8c SHA-1: 1dd869ca18ad9c0e973679442aa3c5d0369ac8ff SHA-256: d78d1a4f3bc061971ef93a68e8af8be53569b63ca27f6349515c3470c8875ae8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://sjamsul-hidajat.id/ck_uploads/uploads/files/19059902522.pdf In PDF document text
    • http://sierrahighalumni.com/clients/878712/File/fexijudimozowiwitu.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/946c61f4c3ecfb6c1dd95978d5c49a22/69301560117.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/2513271484.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/5554372562.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/lavufezefuxizukawigidu.pdfIn PDF document text
    • http://cityhighclassof77.com/clients/9/9e/9ea685038b5a197d2022a69b8c6b162a/File/35777352494.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/96uhsiokv6lt4o32ig8nno36n7/kanakugedizeviwujesedev.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/jufobonizudogakefugetefa.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7030b4aba3---lumukagopetefozub.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/efb1c0d420f86851ba29a9b7fb588763/2512902286.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/439380fcc79658d4f89a1d3de7c8377f/76369871934.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/jewobetawuzuravedadar.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/59635678871.pdfIn PDF document text
    • https://trotusgrup.ro/ckfinder/userfiles/files/jogikanotevagizoku.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/famuzesufukebi.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/38392840594.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1610099b54a52c---42291748972.pdfIn PDF document text
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/4e0671d04f595b32ed58bd1615ef9fef/latijiru.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081fa3299c9c---98003110265.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/nukulibugepuvi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=australian+curriculum+maths+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_off0000e02b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f83d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83D 16964 bytes
SHA-256: eba99734a11d3a8d3faed326d43c6894f9ece80b2fbbbc0b735d58500b9cdce6
font_02_sfnt_off00012390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12390 10712 bytes
SHA-256: 340605f4d186d613448df8f9076f2f09390ee74573940fd2ba57553d14de7b6a

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