Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1a4bce6df1750f2…

MALICIOUS

PDF

91.9 KB Created: 2021-09-02 10:18:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 95b7e8c23e695b7e6162c50c49381066 SHA-1: 674d360560653daa7241a809d49d950f0773cc98 SHA-256: c1a4bce6df1750f2e74075f38eacce0a0a80722ad5fbc5ac2fb2f1275076fda1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting a phishing or malware distribution lure. No scripts were extracted, but the embedded URLs and the nature of the heuristics strongly suggest the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bc09a368ba6---62042719830.pdf In PDF document text
    • http://rialta.ie/userfiles/files/59951965366.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1606d34c17f086---19814036494.pdfIn PDF document text
    • https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/keapeg0ape6dgb0573e2r2thcu/3594420034.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/getibikukujibute.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/zedizipitida.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/zogewozeninovibefewazir.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/0547f987f3e1ec60da9c23e30d56c0c8/86534384100.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608218744ad7d---jarorufalugasuximateti.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160703033b64c1---44767386380.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a77dad895---jupupewakutimiweju.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ec203ad43614fe98857a7cea79172a75/52191305461.pdfIn PDF document text
    • http://thekreativecompany.com/uploaded_files/userfiles/files/97655300400.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/tebosiwakisomavifezin.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/folefezuxisetevo.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608572d3edc1e---tadeguredoguke.pdfIn PDF document text
    • http://h04ydivan.ru/userfiles/file/nonifev.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/b631aa8d1ec40c717d1221ec042c67cb/newapuja.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/36424976427.pdfIn PDF document text
    • http://skisun.it/userfiles/files/20477576691.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/d7c014b9b39cb5326d89272ef52c4eb6/49785279216.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1517d85445304da4c1fc0c73162fb5f7/41784919549.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/misujupivofe.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c5abd4393---26506103388.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=angular+json+parse+to+objectPDF 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_off0000fccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCF 19368 bytes
SHA-256: 707247dcbb2faadfac8930dadc0b1b18838374d0c4e65592f810f5444f337c40
font_01_sfnt_off00013026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13026 10808 bytes
SHA-256: bb79420c106b953693947cec60899cf8f6d146f27ea94a4cc915fe01d9288b8b
font_02_sfnt_off00014915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14915 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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