Malicious PDF — malware analysis report

Static analysis result for SHA-256 d432cb9bba378006…

MALICIOUS

PDF

81.7 KB Created: 2021-09-06 00:52:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 1203859ca083fd281bbe12fbe635d260 SHA-1: 80290bf8d576c4dd8288abbc414dc2dda7d4fccc SHA-256: d432cb9bba3780064ff7f1acb48d73e283dfe365a8092d374b0ce34f12be5dc9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://bioident.pl/photos_fck/file/49403792452.pdf In PDF document text
    • http://anaminfo.com/attachfile/file/70479456174.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/88fcd5be600a7b57ddff24265913f9e1/25121918199.pdfIn PDF document text
    • http://fairmonteast1978.com/clients/71195/File/kovarutekukanapob.pdfIn PDF document text
    • http://phongkhamthienhoa.vn/images/files/tazuvejasova.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/48924957961.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/83121152184.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/wamofofedufuvul.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/53694261360.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16074328634a08---luwikagexure.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/14319042787.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/sutodipevomafemop.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c987f5c89d---misagoluxebagijopezozuwo.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160be245797590---14217236487.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16129d100d5a8c---46371971593.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/1050d03d7964cbd28c3df994571d898a/47905822432.pdfIn PDF document text
    • https://cooperspick.com/files/namogizidavojoxibufid.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/33905985114.pdfIn PDF document text
    • http://sciattella.net/images/file/57307423826.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/zedoxijumupijok.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/riruwolikilofosijelu.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087db85e072d---lifisulusejezewaludufu.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-8-11/20210811055711623642.pdfIn PDF document text
    • http://gddfboiler.com/uploads/files/lufajer.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/xutetanexorokexope.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=suffix+ent+worksheetPDF 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_off0000db61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB61 10560 bytes
SHA-256: 486baa9d54d3490b0527f8a096cee7fe795512fe271e032195583f5c72f22f5f
font_01_sfnt_off0000f37d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8F 17976 bytes
SHA-256: 96cdf6b7028800d7291da85cc3e2049d7732a5a99f95094c98d1da28cc808394