Malicious PDF — malware analysis report

Static analysis result for SHA-256 5573c7ee3a083430…

MALICIOUS

PDF

87.0 KB Created: 2021-09-05 21:58:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8dacc633b11aee479d0db93be9befa74 SHA-1: 677a73f3140fcdaef391cfc130443347aca7556e SHA-256: 5573c7ee3a083430a0132ddd25ba0a85a4732add4e41d4801de713b553edbd1a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution attempt. The heuristics reveal it functions as a link farm, directing users to various compromised websites, one of which is hosted on WordPress upload storage. The embedded URLs suggest a lure related to scanner drivers, aiming to trick users into downloading malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9807

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://pistant.ru/uplcv?utm_term=hp+m1005+scanner+driver+for+pdf PDF link annotation
    • http://earthtalismanjewelry.com/clients/b/b2/b27d4d76c51cd35ccef873a204118430/File/zusuduvibeba.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/j2n4coorf1t7812klfaa1j1su7/21945726536.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/vrbdkmdcvb2sssd1q00fopn18v/31265739960.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/af7024f79dedaef42ca63e64356c6a53/49940630170.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114810308bd5---4822226974.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/wenidisoromolareluzasesam.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f23ff927949---zopefesuwilosi.pdfIn PDF document text
    • https://jcpcdesign.com/upload/ckfinder_temp/files/20210706082845.pdfIn PDF document text
    • http://istvietnam.com/rich_editor/file/28071886833.pdfIn PDF document text
    • http://jucal.es/images/file/nakujuramiji.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/66909346493.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/32442396161.pdfIn PDF document text
    • https://porterbrothersltd.com/app/webroot/uploads/52772330367.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/99849124737.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/f795t6qk4e49rdpa84k007pt0m/mufigisuzifozopanar.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/xumadesunesitaraj.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/65680516784.pdfIn PDF document text
    • https://ka-base.no/images_content/file/18043855124.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/gemejoriz.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/kovexam.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/57416865077.pdfIn PDF document text
    • https://www.opsclown.it/ckfinder/userfiles/files/54946004701.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/87338019825.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/3115142558.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef390f0d35---metevitetanaregitenu.pdfIn PDF document text
    • http://graciaindoutama.com/kingkong/userfiles/files/mikowew.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FE 22496 bytes
SHA-256: 804fe085650b2babe3bd208834ec6342210fa60312b04006ca719322d2c4f936
font_01_sfnt_off000113be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113BE 11000 bytes
SHA-256: 38c5a45b1b5ec1a6b0093d4325d70b212b350b56fe2cdce339eb91771d459558
font_02_sfnt_off00012d51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D51 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_03_sfnt_off0001354d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1354D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1