Malicious PDF — malware analysis report

Static analysis result for SHA-256 777da03b9e15b274…

MALICIOUS

PDF

85.7 KB Created: 2021-09-20 05:58:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e1b7015a78eba5a05808cd4e66e2fff1 SHA-1: d16ef6e0ff7f16f1e70c26b5862b3e53ed776f11 SHA-256: 777da03b9e15b27460b91cf8dd4d28553f97ac4be946bc164443351a037cf2e0
176 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs that form a link farm, a common tactic for phishing or distributing malware. Heuristics indicate these links point to compromised WordPress sites and disposable hosting, suggesting a malicious intent to redirect users. ClamAV detection further confirms its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://queure.ru/uplcv?utm_term=android+super+13 PDF link annotation
    • https://portoggitter.no/content/files/userfiles/file///sosulukumitededuverona.pdfIn PDF document text
    • http://medrea.ru/upload/files/niximikuzawexumodeja.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/xemisoveworegu.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/36058566026.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/4bds5dfr62gl48no853kufq705/mewed.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161460fd6127b1---jufubaxed.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/90193099878.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2932a99b1---lileze.pdfIn PDF document text
    • https://irrisyst.eu/files/file/lolowosewefebevokakaxapa.pdfIn PDF document text
    • http://fundacjahfg.pl/upload/file/4834626065.pdfIn PDF document text
    • https://libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/36626792190.pdfIn PDF document text
    • http://hulstcustoms.ru/uploads/files/xosoposo.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/4d406447218a90d69b8b9a408eb867ab/54573667846.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/55435110210.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/luxomavajirime.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a060d3055---jowopaxuvizi.pdfIn PDF document text
    • http://ruihuitax.com/files/file/8307008291.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/jimurefalevakoxasebu.pdfIn PDF document text
    • http://happyorderfood.com/uploads/files/22865572241.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/77689582534.pdfIn PDF document text
    • https://lmcmanager.com/ckfinder/userfiles/files/ruxexaxesurixifima.pdfIn PDF document text
    • https://stpatswatertown.org/ckfinder/userfiles/files/xazozinidoxowusijitaxotaw.pdfIn PDF document text
    • http://paletydozahrady.cz/ckfinder/userfiles/files/96076391609.pdfIn PDF document text
    • http://tagsu.com/attachments/fckattachments/file/kuripefivikolazuvujip.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_off0000ece9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE9 10384 bytes
SHA-256: d836a7c106be70507a8a185e59d5028a7d2ce90f5032fd775c79aeca77f24d8f
font_01_sfnt_off0001048f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048F 17296 bytes
SHA-256: 3f23f388615bd11c288fdaf9edcb6ce02e0b9a5d0b95b7b0c80d5114995b97f9
font_02_sfnt_off00013138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13138 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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