Malicious PDF — malware analysis report

Static analysis result for SHA-256 82f269d3d09d4652…

MALICIOUS

PDF

68.9 KB Created: 2021-09-26 11:36:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3c6847703730c53bed75cc42e95b4299 SHA-1: 202ca51b39029586c0cbacb69c845ec9b06a1b21 SHA-256: 82f269d3d09d4652bc768d426f91f3fb28cc811370487f7fcd638b21493dbc0f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload storage, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://hantechwelding.com/userfiles/file/2021091012203773499.pdf In PDF document text
    • http://pescepiana.eu/userfiles/files/37212208036.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/viwaj.pdfIn PDF document text
    • http://huzatfokozo.hu/editor_up/sezeluwamexudipenifotimel.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/26714507007.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/mko37f87oughfd6b8npvm7t97f/26231671962.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/nejevanopugafezinuniwe.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/95564790869.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/95439421553.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/ziwunedowawelurizix.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/8495490743.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/wupanudamojivofiwasene.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/08d0db3ce5b29eb70b4557283c23162a/41900928068.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/288b51b23f885c77ed0becd5598fa012/remil.pdfIn PDF document text
    • http://charontrade.hu/data/file/xusabizutodo.pdfIn PDF document text
    • https://cahayaapi1.com/contents/files/51541365296.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/7ohv3lj87ec66h86ajfp24sjuh/dezapiruwiboxeximazulo.pdfIn PDF document text
    • https://gentrilieu.vn/userfiles/file/79678521998.pdfIn PDF document text
    • https://biomisszio.hu/tmp/lejoraf.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/58579365479.pdfIn PDF document text
    • http://casauthienan.com/fckeditor/editor/filemanager/connectors/php/temp/file/bobaw.pdfIn PDF document text
    • http://kirche-treuen.de/UserFiles/File/kefutegovo.pdfIn PDF document text
    • https://comptables-publics.fr/userfiles/file/gibipikudumerijuvow.pdfIn PDF document text
    • http://anm-av.de/uploads/files/lamisibiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=android+emulator+orgPDF 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_off0000afcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFCB 15888 bytes
SHA-256: 56eede600843761db9c09e306b6ec1bd5032c1eb5476aa3526708dbe99361f6c
font_01_sfnt_off0000d6c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE0 10504 bytes
SHA-256: e27718e0a03e53c7dea1500dcab7883e39ed7a321e076492c1c89cf49b44bb27