Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd6fd220c71fbbb1…

MALICIOUS

PDF

74.0 KB Created: 2021-09-20 08:57:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: da7afc6a0d799032df5a79190f3bfd65 SHA-1: ae48d601671193c0a210815c62ae248615ee7fe3 SHA-256: bd6fd220c71fbbb10b87697aa923c2dc25a56bbd16ad92d7101315c1911d36e1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Several heuristics indicate the PDF acts as a link farm, directing users to external URLs, some of which are hosted on compromised WordPress sites. The presence of a visual download button lure further supports a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://clinicaveterinariagoitese.it/userfiles/files/zowirufuvobarewuromap.pdf In PDF document text
    • http://thechitay.com/uploads/userfiles/file/xazimorakopibokib.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/witekezobomepeva.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/13373521638.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/f83f814298f88d968b47d95fe4ce70d4/wewebanofikarobujudeveli.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/0b4ba737ef6484277ec103235993344b/33546463038.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/85277897652.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/gixabawejo.pdfIn PDF document text
    • http://huyminhplastic.com/upload/files/12264762094.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/79211208730.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/1630942353274792041.pdfIn PDF document text
    • https://svltv.in/userfiles/files/62853500990.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/dezolalukiragamu.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/0e6b70f85c70b7f533c6743bf7a42d85/5741760977.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161407e4541777---86855215613.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/tefuji.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/66668414883.pdfIn PDF document text
    • http://industra.sk/userfiles/file/degawiso.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/wefeguf.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/fijojow.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/40094045258.pdfIn PDF document text
    • https://jobtiara.com/files/files/badikagojijegixep.pdfIn PDF document text
    • http://alhegazgroup.com/userfiles/file/vapunajewonorotazumataru.pdfIn PDF document text
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/mimuwakakoz.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/1189790717.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=mini+militia+zakir+mod+apkPDF 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_off0000be28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE28 10396 bytes
SHA-256: 9ce252ebf9b6f6f6d1869f040ad46abb8c7d5d2d3aad162b1196f2df81d72b36
font_01_sfnt_off0000d594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD594 16684 bytes
SHA-256: 1d6ea9eeb543e02fe3ec85d09c940bc5d0eaa744cccb94c1b6e17a986ddcb7f4
font_02_sfnt_off000100ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1