Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ff37dafe162b1c7…

MALICIOUS

PDF

84.8 KB Created: 2021-09-09 13:36:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f622dfc77dcbd83f32b3d2b9b85f539d SHA-1: 2224aa8ef90986d770531e42b476a686123c2cdd SHA-256: 0ff37dafe162b1c79e3e9f472699fb1627f2c1cb91b6dedd686980b739311ea8
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised or disposable hosting. These elements strongly suggest the PDF is a lure, likely intended to redirect users to malicious websites for phishing or to download further payloads. The ClamAV detection and ML classifier further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crysiq.ru/uplcv?utm_term=call+recorder+apk+old+version+5.30+download PDF link annotation
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/2097276253.pdfIn PDF document text
    • http://officegate.biz/admin/fck_upload/file/79068580714.pdfIn PDF document text
    • http://aallergy.friend-match.com/upload/files/posemifazipupipituxokof.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139dba5c9ffc---17048116766.pdfIn PDF document text
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/kagerow.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/voxorapisilerapume.pdfIn PDF document text
    • https://dveropolis.ru/upload_picture/wuvet.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/723c9f3e708d8e8f1d5a8d4478a69cc3/27017716697.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/40890164780.pdfIn PDF document text
    • http://beverly.kopanramen.com/uploads/files/84758521208.pdfIn PDF document text
    • https://nezamirekhaseafoods.com/userfiles/file/netuzalozukuked.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/zizenemuzame.pdfIn PDF document text
    • http://proximeo.com/ckfinder/userfiles/files/napasumuzido.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/zegodovebetivulejegaziz.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a51163776---rapabofolevenevonebuv.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/70428161021.pdfIn PDF document text
    • http://vhktn.at/images/content/files/8222908330.pdfIn PDF document text
    • https://premiersuli.hu/files/files/xutoxo.pdfIn PDF document text
    • http://laiksmodalux.lt/app/webroot/uploads/userfiles/files/milovupudaxure.pdfIn PDF document text
    • https://bipalisdemo.dashindonesia.com/userfiles/files/bigujikuremegamamogedis.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/41208552498.pdfIn PDF document text
    • http://mariancozma.com/_user/file/81249372827.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/tejosur.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/28888796921.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_off0000e405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE405 18204 bytes
SHA-256: 871a83f5a1c2fe3f9ad071b1b52c37e948057e645fdc198a64e61203e73ad2c4
font_01_sfnt_off00011354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11354 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B6B 11176 bytes
SHA-256: 96b7f01e2041054abc8a6ad1b912920312f1df8973b060262252680f9c9dcaf6