Malicious PDF — malware analysis report

Static analysis result for SHA-256 80457dc611903a1c…

MALICIOUS

PDF

85.5 KB Created: 2021-07-14 03:48:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 40c6b262c34509edc79ebac083f345c0 SHA-1: 89d419387b580af1bb29b9ae27e9c4d1105a5243 SHA-256: 80457dc611903a1c3aab301db310a36801e53d168465b637e1188ae1d0f6799b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest the primary purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • 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.
  • 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 http://handsonmontessoripk.com/userfiles/files/26933581020.pdf In PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16096c4f1a701d---64281171888.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/47588426846.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1f77395fa9---79544636235.pdfIn PDF document text
    • https://andrejc.si/files/file/kuvomebizidireseveju.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/de9cfdef8d027ae4e77aa773d10cf4dd/80667516411.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce1c5bf837---11435950056.pdfIn PDF document text
    • https://strechybenesov.cz/content/xasuburu.pdfIn PDF document text
    • https://avenue102.com/uploads/file/benoz.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021060511505530.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/0d2fb73bb0d8c26ffc6fd8fd115ab34e/13252424706.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f6ad4bca2---wiwurepawexagatifiso.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/najuzofibuzozepefuseduv.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160847817026f1---dogikazupibosorafu.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/63c2246d236692f0e6aaaca5afc0e9ad/moguxobe.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607230532431b---527078421.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/c1e9147ff9dfbbf19e00096da9726efa/waworalufaxirov.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/088b86971581a8207d7d794fe7809142/fonakokol.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202161523018745.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/tuwarewulip.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607afb72a38b1---29020291157.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=transmission+of+ascariasisPDF 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_off0000edf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10604 16920 bytes
SHA-256: 9d08c3604116c6221a51dd2a3745ca61c54e00b762a2bcaddaabac22af2a5547
font_02_sfnt_off00013215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13215 10184 bytes
SHA-256: 3eadce376930d8011e9b5f7a98078525663cab8f09183bc8c480980103a547d6

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