Malicious PDF — malware analysis report

Static analysis result for SHA-256 127fae6f4cd5c34b…

MALICIOUS

PDF

82.9 KB Created: 2021-09-07 15:45:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 05e020f704fcdeb5ed73fa2c26224fba SHA-1: 1f2d67c2715bc8736abc0bab3ba5e9e661120be3 SHA-256: 127fae6f4cd5c34b07a74efb44e7b1146949881bc9a50f219a36ed30094fde25
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. The presence of a link farm on compromised CMS uploads and disposable hosting suggests an attempt to obscure the true malicious destination. While no scripts were directly extracted, the PDF structure and link farm indicate a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://deltarents.com/upload/ckfinder/files/sisorofasulivamuwudut.pdf In PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/datojitowenil.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/75gfkf71t99vpp2prdfrml90aa/34969198652.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/e008407e8d56297704dfbd10b91f4e50/99292855006.pdfIn PDF document text
    • http://giftboxvietthuy.com/upload/ck/files/13778200064.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/nixusute.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/gewajulobipesup.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/12958406142.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/c87b66bf6612afd9464f43c82d3b96ca/sisudozavilama.pdfIn PDF document text
    • http://beepost.vn/upload/userfiles/files/96620032237.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe4f2f67349---murebef.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/18365059322.pdfIn PDF document text
    • https://sapporopools.com/contents/files/13167428208.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607697b78994d---jutudeju.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161290872b3777---wimowepalutotosolozewok.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/novovubeteradugevotoxol.pdfIn PDF document text
    • https://webmenuplus.com/images/file/25036335208.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7037d79647---sidipinanig.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/kexawe.pdfIn PDF document text
    • https://cyklo-wellness-penzion-palice.cz/content/zusakurefadefikatapezit.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d139ce5d3---55082213173.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/xememezelo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=download+jpg+to+pdf+converter+for+windows+10PDF 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_off0000df4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4D 17060 bytes
SHA-256: 44581ab6ebe001ad2e536ea9a3a865382e8c79e1b2ddb280a478621d124953c6
font_01_sfnt_off00010b50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B50 11252 bytes
SHA-256: 61561dc6ce85ccdf12552dbd64edb4cca71929556af44378ea70f5e7ef6f49ae
font_02_sfnt_off000125b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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