Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bbf4e6975f1edcd…

MALICIOUS

PDF

84.2 KB Created: 2021-09-06 04:15:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 549cbc522bc565200fda9f8c5b81a41d SHA-1: 6969aa46ab4387dd86a64ea23c6b484e86ff688b SHA-256: 5bbf4e6975f1edcd0f0967ea58f015c707f437e97e88280b6fbf0e6da80a710f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm and contains numerous external URIs pointing to various websites. Some of these links are hosted on compromised CMS uploads, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • 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://wastran.ru/uplcv?utm_term=reading+comprehension+worksheets+1st+grade+pdf PDF link annotation
    • http://nhanvietgroup.com/demo/xay-dung-tnx/upload/files/26421300538.pdfIn PDF document text
    • http://pr-jam.com/ckfinder/userfiles/files/84795553183.pdfIn PDF document text
    • https://itandem.net/ckfinder/userfiles/files/topefub.pdfIn PDF document text
    • https://sambelteri.com/contents/files/bujexomasukuligamapufo.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6b01954b7---87149830366.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210811205818.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2f0ae8ee8---58616977124.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/10007785154.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/41369214142.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/xuperorinowebinoki.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/1fcc8f950212ff04fc8a0b9ea1d57740/27910739696.pdfIn PDF document text
    • http://pamat.ro/UserFiles/file/48591478728.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/13781993533.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/36796373559.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/80872533678.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161103f4893adf---kexasefesiko.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608138be98a33---2144420012.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/mimodafofoz.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/oa1mp6kj6h81evngpadgd4r91c/97256004556.pdfIn PDF document text
    • https://corghialberti.it/file/dufumin.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/bewebivibukiluj.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/rutolimotojiw.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/48220326860.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/56228825471.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/47307895645.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/42603706305.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_off0000e030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE030 18392 bytes
SHA-256: 47da72bac909c2b8ee269abe54e6c09d416453593271c5ee3624ea6910556e81
font_01_sfnt_off00011020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11020 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12837 11296 bytes
SHA-256: 2c3d0ddca7e98e253959b7f837f3ffa461559fbd69cc874cb76aa0cac480f043

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