Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffa78122fc455bff…

MALICIOUS

PDF

86.2 KB Created: 2021-09-07 07:13:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b952797288f1e513114f3e2d6a2ec280 SHA-1: a34e51a7487eaf39d3fda12073691c35fcbd4658 SHA-256: ffa78122fc455bff2dbbb1c04d4a1b14be0744a9649b8ed596d97fa69fd6e037
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous external URLs, many hosted on compromised WordPress sites or disposable domains. The presence of embedded URLs and the overall structure suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://laborke.ru/uplcv?utm_term=canto+30+purgatorio+pdf PDF link annotation
    • http://conelser.hu/fck_uploads/file/83527107646.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a0e2e109d---zonosigavi.pdfIn PDF document text
    • http://mesterek.net/tmp/susikot.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/buseganurejis.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/12206916194.pdfIn PDF document text
    • http://accronline.com/userfiles/file/62912303976.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/bigux.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202108111456225195.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/29186162655.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/7ae707f75a4f256923e28f91fedd7d1c/40430864993.pdfIn PDF document text
    • https://bengalroys.com/ckfinder/userfiles/files/90713805146.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/jukigun.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d227c00db57---307695632.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105560130cd2---63532190876.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/dedorodirafekoxo.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/o75d55kudv0vs08u8o7r2u3a46/56989107984.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/89541547747.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed743bd00e---50560680457.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/v3olhoa5gt2j1aec4i22bk8lta/22870592866.pdfIn PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/matapakaxutesaxir.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/15130201925.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/fimebejiveputenexe.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a382ee2679c---54521666269.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_off0000eac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E0 10752 bytes
SHA-256: 70590aff720f2969d575a7696fde2070ddafeddf7455c61063eb3efb069eb14e
font_02_sfnt_off00011b80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B80 18108 bytes
SHA-256: 78f6e672dd25dc08854b120eeeab8b299442ecb05b040774d0f7026a13c08d66

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