Malicious PDF — malware analysis report

Static analysis result for SHA-256 88167f638e82b515…

MALICIOUS

PDF

84.8 KB Created: 2021-09-02 04:21:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9ea54092896a4b5d32fded0f093dd30a SHA-1: 1a2e0ba0633262c09be91ecba3a0279a304353ff SHA-256: 88167f638e82b515d261e09a26aba748dfa823fe42b24e9c19e2b554305e5aad
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which appear to be compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content. The heuristic 'SE_CALLBACK_LURE' indicates the document's content is designed to trick users into calling a phone number, a common tactic in callback phishing and tech-support scams. While no scripts were directly extracted, the presence of multiple external URLs and the callback lure strongly suggest a phishing or social engineering attack. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://inwebjor.ru/uplcv?utm_term=gulf+migration+services PDF link annotation
    • https://icbacademy.com/upload/files/64125455308.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/74798718477.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/66552547480.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/73983575578.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/89354716932.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0705feef04---40194336027.pdfIn PDF document text
    • http://sourceit.ke/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/xamexagofik.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a701864872---rajogiramo.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610ae26f59cdd---favelogojesutilewutepezux.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/fokefepozesilomiviponot.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/misivimalezibelabunidexaf.pdfIn PDF document text
    • https://rewaqousha.net/userfiles/files/tatazasokopegomo.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/36867357434.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1608e781c68ac7---gajevumipatijelaputagu.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/9ddc2e367e0b2cd091eb51c149d65321/36935026603.pdfIn PDF document text
    • http://partnercable.hu/files/xudifo.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e668a7fb36---guxefakevidomejigoxodikex.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/149ml7gn78br903uvm7l7a5iqh/xuxuvexasirasugexiwig.pdfIn PDF document text
    • https://themalc.org/files/file/55238418681.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents/files/zezezotobeburulijut.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/69571631389.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e97721aa07---wurobefovadejenagenu.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/c53uv8mi9v17sac9k4u1k2v123/sibobopuvoxojupovasem.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_off0000e343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE343 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB55 18640 bytes
SHA-256: 8600d3b6938edadf6a35f9cae5412ff666776814c0b9fab9c1c10e57d8b1c460
font_02_sfnt_off00012bf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF2 10884 bytes
SHA-256: 15a975365a57c348e17245f498a0c38f8f6760b1d6548cedc81aa4ca59151098

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