Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcda2b25be910b9e…

MALICIOUS

PDF

68.1 KB Created: 2021-09-26 13:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 13d34e9afb38ec85110f696cf9773ae3 SHA-1: 99a5408eb25be66b61f224353ff3425e56a4e055 SHA-256: dcda2b25be910b9e9b69caf932f2a3f491c43bd5b6765db2afe011fb84d6b96d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains a single image and minimal text, typical of a screenshot designed to conceal clickable links. The numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggest an attempt to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and URL farm indicate a likely intent to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • 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://geotersrl.it/file/27270463689.pdf In PDF document text
    • http://ubestsports.com/imager/files/20210925085542.pdfIn PDF document text
    • https://kiptep.ru/file/57892136818.pdfIn PDF document text
    • http://redskap.ru/userfiles/file/83196395233.pdfIn PDF document text
    • https://ccskin.com/geektic/files/86370642516.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/46040675607.pdfIn PDF document text
    • https://remini.hu/userfiles/file/ruwisad.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161474438dc36d---42883300559.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/dbf3929f561c1ee1d991b711249336db/49166989848.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/47783069345.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/soxiwavenip.pdfIn PDF document text
    • http://tubelessons.net/cms_images/file/97425933682.pdfIn PDF document text
    • http://klenderbio.com/upload/files/ruvami.pdfIn PDF document text
    • https://cncunse.com/d/files/vijeminajitibeguboxif.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021091521050742.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/51273979683.pdfIn PDF document text
    • https://digireg.cn/upload/kikawumubudemot.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/75925302532.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1614692e04c277---vewimojusugaz.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/66931a90c5f8c4e59bd8d06f784042c4/80633057560.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=once+upon+a+december+piano+sheet+music+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_off0000ae3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE3A 11104 bytes
SHA-256: 8bc51d57e79369a0f83382a8695276ca5d6695042c1075f05512a48f84eae7df
font_01_sfnt_off0000c7b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B8 14180 bytes
SHA-256: a904decf45e302c69b11b7520244f932b81804c830c3ee19e9c12e082309c77b
font_02_sfnt_off0000eadb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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