Malicious PDF — malware analysis report

Static analysis result for SHA-256 a613ffdd145fa6e7…

MALICIOUS

PDF

49.8 KB Created: 2021-09-29 12:45:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9d18e3ca162980521970b71671c71291 SHA-1: 2fc85c4ebbce610b3263bb547a9b79d842e42f9e SHA-256: a613ffdd145fa6e7a9a643ce799f0407fff054a84912cc3dc13241b0040267df
154 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicative of a link farm designed to distribute malware. ClamAV detection and ML classification strongly suggest malicious intent. The embedded URLs and the heuristic findings of a 'link farm' and 'compromised CMS upload' confirm the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7281

Heuristics 5

  • 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
  • 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://crewmak.ru/uplcv?utm_term=screen+recorder+for+cell+phone PDF link annotation
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16133816b754ec---jezofipapomatudaz.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/kavid.pdfIn PDF document text
    • http://papienbanana.com/user_file/file/fixojisugumisewuzu.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/62379562936.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/46170141965.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/wovetofexovumemituv.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/vonijusodemoxeze.pdfIn PDF document text
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/3213909745.pdfIn PDF document text
    • http://dongamold.com/fckeditor/upload_files/file/6673148521.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///64008915436.pdfIn PDF document text
    • http://warehousetraining.ie/images/64206457638.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/94487905427.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/ninavozo.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/70548178884.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161410805c11ef---fopofoxenazopino.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161383d8173c01---tiferevipax.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/caa2d1d44e17ba55121ed04dbed3486e/47997595453.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/e6ddebe12b5986dcbc66cf7edc05813d/23269873189.pdfIn PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/23156378297.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec0520c744---fozuxeluveseso.pdfIn PDF document text
    • https://semangkamerah.com/contents/files/50237008547.pdfIn PDF document text
    • https://mapithanhcong.com/upload/ck/files/14012769577.pdfIn PDF document text
    • https://777mto.info/contents/files/ziviromolavigimubaf.pdfIn PDF document text
    • https://pracowniatechart.pl/fckpliki/file/bevetuxabufujuvirotivoji.pdfIn PDF document text
    • https://sydneystudytour.com/accounting/userfiles/file/95082783122.pdfIn PDF document text
    • http://diadiemvui.com/upload/files/20779543836.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB395 10272 bytes
SHA-256: aa1142d43650ec53e5bf222a9abaa47261b8c7a76ccf9a99ffb2eb1221bdbc67

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