Malicious PDF — malware analysis report

Static analysis result for SHA-256 d09ab8f9c86cc4d5…

MALICIOUS

PDF

70.7 KB Created: 2021-09-26 08:13:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: f59eddad6807a6380411ca99f1888f25 SHA-1: 24f753d9437beb9fda47c5e1b9f19e08834ed13a SHA-256: d09ab8f9c86cc4d5c2e0f4d2f67bc690f13d63a34bd80e728bbe0793184bab08
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs and is flagged as a link farm, with several pointing to compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 7

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://ketchas.ru/uplcv?utm_term=call+of+duty+modern+warfare+3+download+torrent PDF link annotation
    • http://thekreativecompany.com/uploaded_files/userfiles/files/kezigipolopisivasi.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/88406558200.pdfIn PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1632254762.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/48791605371.pdfIn PDF document text
    • http://sd-admin.fazendapenaazul.com/ckeditor/uploads/files/xodoteg.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/munebufunexutul.pdfIn PDF document text
    • https://omprintandpack.com/userfiles/file/wovobiporeroni.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/lawituluxikelomexo.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c0e6ea8d7---xuvuwiwefovemalexu.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134875b67dc9---romagelodililipupumo.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/tolopepapamaxefuv.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/s7s2vbnk2krs5bmsiah36uaegb/70836570810.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/6147519497.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/nizapazot.pdfIn PDF document text
    • http://rtm-plus.ru/ckfinder/userfiles/files/16652240373.pdfIn PDF document text
    • http://confidenzacsapagy.hu/upload/37495081033.pdfIn PDF document text
    • http://wgadget.com/file_media/file_image/file/mapojuwugoxabudajuf.pdfIn PDF document text
    • https://etest.vn/app/webroot/uploads/files/mojofalewifef.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/dilimofinevixuzebidus.pdfIn PDF document text
    • http://homokkepek.hu/editor_up/70659373872.pdfIn PDF document text
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/35613250216.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/69486579375.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/sijewenanikajuzipo.pdfIn PDF document text
    • http://neogmbh.de/www/sites/default/files/userfiles/file/42622281128.pdfIn PDF document text
    • http://www.mmalappeenranta.com/tiedostot/files/77282217698.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_off0000b12e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB12E 10756 bytes
SHA-256: 2a096fc2fb832d94cb17b285dc90d51ee6e275bc02c26f2f7647e82268e27733
font_01_sfnt_off0000ca16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA16 15896 bytes
SHA-256: 5e5455926b9028780d84f90bec27053a6cd6585a6c87dff01fba13526e7b004b
font_02_sfnt_off0000f2dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1