Malicious PDF — malware analysis report

Static analysis result for SHA-256 637543989da2e025…

MALICIOUS

PDF

81.7 KB Created: 2021-09-04 15:58:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b3229781a02a2f859eaaa72fe27e937b SHA-1: 5dac582b26d4a7955bed457680a20ee10708b7c4 SHA-256: 637543989da2e025f99ec14594e2f4e33972fb5cba2954c46b81fd7b3b53a8fb
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable domains, a common tactic for distributing phishing lures or malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery. The document body is heavily obfuscated and contains metadata from wkhtmltopdf, suggesting it was programmatically generated to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://cructi.ru/uplcv?utm_term=analisis+koefisien+determinasi+pdf PDF link annotation
    • http://romento.com/uploaded_files/userfiles/files/faninufesivijenij.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1610d8bf03b36a---jisarijugewu.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/lemesamewapuvivoxisiz.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2f6cb1bee---44661446862.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/goviwosivasotodipusi.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021061812502373499.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/jezetidam.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/71883965188.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e8ef0b58267---gezomafulisonale.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/60138984071.pdfIn PDF document text
    • http://elma1.ru/!upload/files/bisaf.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119825541f93---10472365533.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611d029bf3995---tigobug.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/aaa6ab70f175441bbf7d15b8269ee07c/83424764340.pdfIn PDF document text
    • http://bigpictureresources.com/userfilesbigpicture/file/sabivumanesuxumusote.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210623_B9AA4A77D9DE00B0.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/a593a1a2b381cf66e53b8322acceb6e8/wotetidefoboki.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160742c9d1575b---xenivu.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/lotaxewixuvarelevujo.pdfIn PDF document text
    • https://wrd13.com/force/file/bufosadazem.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/xasemosoranunamagoxiwo.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/ravesuvixakoxurabafoki.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/nurudamofimobibogoxani.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160b23737776c3---48979786499.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160ed8521f0c05---jukipe.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_off0000da1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1B 10732 bytes
SHA-256: 497718e6d43771e7987c04cdc1ec80a774d6fc56936b9ff61b7e05911cdc7f55
font_01_sfnt_off0000f2c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010adb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADB 17572 bytes
SHA-256: 865b204bd71185715027815c75acd8be60a34ded8d98736b75893c0f2c76dc76

Open this report in the interactive analyzer, or submit your own file for analysis.