Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff24df3e937f8b24…

MALICIOUS

PDF

69.9 KB Created: 2021-09-30 10:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 53dd5e89306f170083a8e056d7c95cbf SHA-1: 52ac93db47514003afce5f8e484bd2a87655e8ad SHA-256: ff24df3e937f8b2428671f30b41ce548f7dfcc9fd9e395cca55da183dbe9816c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or redirection attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612efd5239e1c---xupufezofaxokoketek.pdf In PDF document text
    • http://www.pattyn360.com/upload/forum/files/99798687866.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/ce4b4c678b77f7877bbc10d2b9a51267/9932757161.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16145b8c23add2---xogorezazaluperefazupivad.pdfIn PDF document text
    • http://parkety-patemal.sk/files/file/vusewatexewa.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/favikusekifol.pdfIn PDF document text
    • http://kidzcastleschool.com/singhania/downloads/file/rewetinimijem.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/90000969257.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///nalopofisawakiw.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/37290559528.pdfIn PDF document text
    • https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/74507585944.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/39954261869.pdfIn PDF document text
    • http://movediary.com/userfiles/file/mitixomerezamijajokux.pdfIn PDF document text
    • https://ccskin.com/geektic/files/14612250915.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/tanizezuduwurojaz.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/42977168319.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/32234919674.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613504a3ab43d---10278609152.pdfIn PDF document text
    • http://yoga-privates.com/yoga-privates/file/kitux.pdfIn PDF document text
    • https://derfo.info/resimler/files/48426900041.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/vodorafovapugizuguxute.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/77314141879.pdfIn PDF document text
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/71828284514.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/gareruwojugirelegub.pdfIn PDF document text
    • http://dolonchem.com/upload/files/xukukafiwosovuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=need+for+speed+most+wanted+2012+psp+iso+free+downloadPDF 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_off0000b0e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F6 14780 bytes
SHA-256: 5b55c61498e003780039ff5eb1339ae54b2b1ba97bbdc1c45ce96a8f7dd9ded1
font_02_sfnt_off0000eddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDC 11016 bytes
SHA-256: b84e6641db53c460d9b4551cddb60a4417373a6ee633645a1701e0f1349f6a9d

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