Malicious PDF — malware analysis report

Static analysis result for SHA-256 758ceb2c04e1e841…

MALICIOUS

PDF

103.7 KB Created: 2021-06-09 22:41:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: ebea1ffc3f788eacbd071fed07747d58 SHA-1: 8a014adddaa19e06915bd0cef500978cf446dd90 SHA-256: 758ceb2c04e1e8412da92f1cbfeee349354db02505b82fc83a41e7df69ba8dd5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The presence of a 'download' lure and the ML classifier's high confidence score further support this assessment. ClamAV also detected this file as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cructi.ru/uplcv?utm_term=download+alien+shooter+android PDF link annotation
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/035c7f522b2344dab0c85eb12adbd3dc/49283304232.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/202c33b5081aeff519304bf9ebf52200/lunezu.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160814753b32f3---68590074881.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/16086c3babf821---24367663448.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/3cf8fea28611c87c79b60aa5d7bbc6df/12493762455.pdfIn PDF document text
    • http://babamoleskine.com/files/file/54976177852.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/74a972d280a6c330d905f598b9a183c2/fixulubu.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/955ae20794e27f8ec67302ee9d9f8f77/vokexumebevijik.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/patilakalilufotopomatik.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d85029c6d7164a79f014430a1e7878a7/dubidopemumepera.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/6beirqskielvcjmo6l6a0jq6a3/garibotuwipikisirajam.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16091c12bd3f90---xemotezotivetizu.pdfIn PDF document text
    • http://henri-ruch.ch/doc_pub/file/liwuto.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c27999d453---xazepafadesuketebolit.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/c371deece4b46f29aaf0994b6e5bc472/murod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012f8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F8A 2960 bytes
SHA-256: 9e8301a812e0963997f2c69c75bfd39e7fcc44359b8a43baf6657440e065e79d
font_01_sfnt_off000139fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139FA 5004 bytes
SHA-256: 1f6ae0154779ff80c057a50641e76eb66b1e4f17b6ef451a26ebc9d4af6700d7
font_02_sfnt_off00014b0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B0A 15924 bytes
SHA-256: 76d1197e6077561abec34d41f8648e1a77d3e3b5d7a7f0ec3d62443b492425f7
font_03_sfnt_off00017a2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A2E 16616 bytes
SHA-256: 5868e3cbc90c1c96838836c01da454b9fc870479cf67e8516f0db0a20edf6b50

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