Malicious PDF — malware analysis report

Static analysis result for SHA-256 86f7a5d9db832cdb…

MALICIOUS

PDF

74.3 KB Created: 2021-07-03 19:00:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: a7b7d75022236907e43ba3075085f238 SHA-1: 66acc7b8cdcb5a2c031e4a6f654589929e4b4af3 SHA-256: 86f7a5d9db832cdb85e0b62c79ee98cf92c526c2f30d24501eec57ee98ad72ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 CMS upload storage, suggesting it's designed to redirect users to potentially harmful content. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ddc82c4b5---sijipovapaxaledegunumu.pdf In PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3e168f6cf---28325345797.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ddaba13daa---35803778532.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/2b0a2be91a798868a5840d125d8ca799/20711684361.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/321574fe20b7b00bd4e08be726327eca/xuwavakopepirijovux.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d4ec0ea3c25---11054103406.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2f7835319---geliresisuba.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/3f2373b15006ab73a6987ed9807ea4cd/lugedaxuzejiba.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/goperud.pdfIn PDF document text
    • http://bulongvungtau.com/media/ftp/file/68897750648.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/busevozafumalokojenefofi.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd2a9963d1---87898704691.pdfIn PDF document text
    • http://kids-ex.com/98524733664.pdfIn PDF document text
    • http://email-database.info/userfiles/file/23825233222.pdfIn PDF document text
    • https://rendiamovisibiliglinvisibili.org/file/ferije.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/jupal.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/tijiwimiwikawonoxozufibu.pdfIn PDF document text
    • https://dolcezzecaffe.it/file/kilolegorexikodutoga.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/xagifubexulovofarobin.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///xisugodo.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/8skagq3trhmps74h3t1d9uc826/gedisujupikana.pdfIn PDF document text
    • https://soechi.net/userfiles/file/jesopasabezizimolapalolel.pdfIn PDF document text
    • http://jaatkinson.com/userimages/latitunilujegamewajabavi.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/na3iqi4hj3u7bqfulhbkaah9bf/44260890402.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c5db34cd36d---newunavese.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=reported+orders+and+requests+exercisesPDF 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_off0000c0c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D9 10852 bytes
SHA-256: c427483cafd66bb52430f0b90781d04a0c6885ea41255d8786fbd9e126c817be
font_02_sfnt_off0000f1d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D8 16260 bytes
SHA-256: 14f05fcf13813fd73b819f594913d9a8a170f98ba365e2fba2079750c548c6b9

Open this report in the interactive analyzer, or submit your own file for analysis.