Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d1ff183b289624e…

MALICIOUS

PDF

83.1 KB Created: 2021-09-10 22:45:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f3c7e0574a4db49454c1d871ce4f4e34 SHA-1: 14fdc4a588d33cc6409f219aefb4b6c79ec2c125 SHA-256: 5d1ff183b289624ef3feacdf417dbcdbd867973588d0f2edaa8ed5fdf28de989
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 functions as a link farm, directing users to various URLs hosted on potentially compromised or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://hzqljsj.com/images/upload/File/78959101677.pdf In PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/63725227447.pdfIn PDF document text
    • http://vecsecity.info/editor_up/tadil.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/risepe.pdfIn PDF document text
    • https://peusch.lu/userfiles/files/70121324254.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/gufufipodekuvuwix.pdfIn PDF document text
    • https://italvaping.com/file/siwifusogiwo.pdfIn PDF document text
    • http://bbbo.handyfriendship.com/upload/files/kodulonu.pdfIn PDF document text
    • https://enkaotomatikkapi.com/depo/sayfaresim/file/fadanilonivalis.pdfIn PDF document text
    • https://pyccenter.com/images/Upload/file/fipejobexinemugepibotom.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1613546342db5f---21033792085.pdfIn PDF document text
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/56205074797.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/buxazapan.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9a09ed45f3630555d7e8acf0a0e89a8b/lakufapadurafamokomefuwi.pdfIn PDF document text
    • https://inks.bg/userfiles/file/56100602737.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/50809511897.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/fokisujemotegebir.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/515210348.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/21423576701.pdfIn PDF document text
    • https://czus-lukasa.sk/userfiles/file/zesan.pdfIn PDF document text
    • http://www.milestonesmn.org/ckfinder/userfiles/files/memitabijofuxidaxovigewi.pdfIn PDF document text
    • http://fabriquetextil.com/js/new/fckeditor/userfiles/file/raselareru.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/62833476855.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/76b6b3f25d6ac82ae43ff1d2bc4f0b7e/53344869025.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/jce697skfuctt4vkgs2vma06k4/vasegedega.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/kemifikinolurebufe.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/woxemololoniw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=herbert+the+pervert+soundboardPDF 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_off0000dfd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD6 10648 bytes
SHA-256: 424b176828657bcaf60101f1ae475a254a0941c79e23eb9566eec3980de6446b
font_01_sfnt_off0000f7ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EC 18008 bytes
SHA-256: 63a7b11b7c737b3870e3ee8506d757c82c3711f697f8ec96d2224379a9d8063b
font_02_sfnt_off00012701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12701 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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