Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2b22fb34f25acd7…

MALICIOUS

PDF

88.5 KB Created: 2021-09-07 16:13:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b1e2f6b401efdf39bd33ae6e28f5f53f SHA-1: de8ffd98c9d180f209982caf99403992b01f0f00 SHA-256: b2b22fb34f25acd76a47e505bc82c44fd7a3a79ff5996a7c5df9e493fb4969a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites, indicating an attempt to distribute malicious content or phish users. The presence of numerous unknown URLs suggests a broad distribution effort.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://poney-club-romilly-aigre28.fr/userfiles/file/vixuwinex.pdf In PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/969ccb7a3c16b2dc8cd3eecb5ca843c6/lutitagelanagipedoxixo.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/watidozokosokikizaloxebab.pdfIn PDF document text
    • http://centronegozi.com/public/88493101054.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160873fb02384d---65526744113.pdfIn PDF document text
    • http://zlato-invest.cz/upload/files/44943219214.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/2dcf903d806edd2cb1c0c5bad763672a/livamezapuzakokezabeto.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/lepufugekedivukugukubupa.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/xakatosinir.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-7-5/20210705170249357529.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/2a75614d6494f14df71a0cc255ae0a72/72357591180.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/17686179904.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/ipkhibs49fdg3fchgpb0p5nsqg/59035986778.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c644be1b9---totufa.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/zefaxifubeke.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c81edaee19---27834746355.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/i435h4c2dvdko9p0bgpon99g9c/kaveweraw.pdfIn PDF document text
    • http://tiga.co.th/ckfinder/userfiles/files/sikiralubulexakop.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/10006338639.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/vaxixazozutebe.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/tutumud.pdfIn PDF document text
    • https://euforbiabulgaria.com/uploads/pages/files/86218153010.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/kiwumix.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/satemamiparujijakifumefub.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/resiborejada.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=guitar+chord+progression+practice+pdfPDF 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_off0000f5ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010dd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD1 10992 bytes
SHA-256: cbe7e26d9eecf0a1db065afbdd7f1438a09e9ab318f06a7ada145aea4ea790d9
font_02_sfnt_off0001271c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1271C 17472 bytes
SHA-256: 6910d4a499f3c7f4c8f44dbe3750064197ff7039c0d5391d7ace11edb9b2ba40