Malicious PDF — malware analysis report

Static analysis result for SHA-256 706d842735f51270…

MALICIOUS

PDF

74.8 KB Created: 2021-09-09 09:37:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c2e1cf9cb7156a73138852aa87bb68a5 SHA-1: 822e9bf90258791955060ebe99d8f9e02a313e7f SHA-256: 706d842735f5127063819bd8f293e0a2034b58b24f71ad3c0422497885b283c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 6

  • 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.
  • 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://conexusinternational.com/ckfinder/userfiles/file/tiwevedexiwol.pdf In PDF document text
    • http://salkim.com/userfiles/file/dovadit.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/suledivanovaduzemetepe.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161387a7c45ae1---bepetetisenuregavinif.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/28549242886.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613942d86e3a9---voguwamata.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/guxuninamufopuxom.pdfIn PDF document text
    • https://digireg.it/upload/jorexezerok.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/65648616988.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16132d98b58f44---jeginexe.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/folikerobixisubemanixig.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/39000582123.pdfIn PDF document text
    • http://horizonpestservices.com/userfile/52537224415.pdfIn PDF document text
    • http://www.cemeba.com/uploads/ckfinder/files/2785130325.pdfIn PDF document text
    • http://grabnerestriche.at/pajune.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/39558340414.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/jexafusigu.pdfIn PDF document text
    • https://wonkingchina.com/d/files/61020643739.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/makugisiz.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/2550ff7cbe4d9739aad22aa12ff8225d/41443245339.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/2396967516.pdfIn PDF document text
    • http://uhorder.com/upload/files/pubenod.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/19296120998.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/4999800207.pdfIn PDF document text
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/fiworukofo.pdfIn PDF document text
    • http://herve-coiffure.ci/files/zeretamosopofalaxomo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=vn+editor+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_off0000c2b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2B8 16900 bytes
SHA-256: 3bbbdf91fabc770a5cb74f0885d1d89d582684231051ea143b83751777625733
font_01_sfnt_off0000ee87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001069e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069E 10232 bytes
SHA-256: 8193009cf96c35a787346d1043065e146f79c706db0fed7fda6824e8726107de