Malicious PDF — malware analysis report

Static analysis result for SHA-256 a36c4a59fb75c0bb…

MALICIOUS

PDF

79.5 KB Created: 2021-09-16 07:29:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 286493976ab2f4a41b80e438f8cd09ee SHA-1: 732cb4ffffb4a3323e36909146b0ff4c9d2d49f7 SHA-256: a36c4a59fb75c0bb5e18b75bf8b9f6f6d26f409a318333edd3b9d6233de85935
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs that point to other PDF documents hosted on various websites, some of which appear to be compromised. This pattern is commonly used for phishing campaigns or to distribute further malware payloads. The presence of external URI heuristics and the compromised CMS upload link finding further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://krisoc.ru/uplcv?utm_term=download+rock+hero PDF link annotation
    • http://gsemilia.it/userfiles/files/jupofewi.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/24614211721.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/53113420025.pdfIn PDF document text
    • https://oreopay57.com/ckfinder/userfiles/files/67809130870.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613dab9607f0b---73851877228.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/rajap.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd208c6f75---kumiminawupowazukaposu.pdfIn PDF document text
    • https://wfbulgaria.com/uploads/wysiwyg/files/19803293284.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-12/20210912202818394520.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/pelajaxativosutal.pdfIn PDF document text
    • http://aotwcasino.com/ckfinder/userfiles/files/40353924865.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/jewezisibunu.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614129867e6f5---75374235001.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/fuwotajew.pdfIn PDF document text
    • https://avenue102.com/uploads/file/pefinelululin.pdfIn PDF document text
    • https://aokman-drive.com/d/files/54505999134.pdfIn PDF document text
    • https://adrfarysz.pl/userfiles/file/nejuvobixuw.pdfIn PDF document text
    • https://ubitanduk.com/contents/files/fulakusurom.pdfIn PDF document text
    • http://artikos.pl/userfiles/file/12541252946.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/folufadurodo.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/7898044839.pdfIn PDF document text
    • https://listocrm.com/userfiles/files/tavosamoked.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_off0000d400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD400 17556 bytes
SHA-256: 66ba0e83c5021025800a65857a5949529742840bd864395f2ef4c8fc75926e33
font_01_sfnt_off00010167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10167 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001197e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1197E 10288 bytes
SHA-256: 85b7079ca94cf3b60cf8d3cd681c05310c8c4e6876c1452ee94af3b93b7df78f

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