Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d7cd18acf615324…

MALICIOUS

PDF

112.4 KB Created: 2021-09-05 06:57:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2d3ba1b1f1b4fec31d96f967bbf9ec06 SHA-1: 8c3bc2fe54f4b9f9dce307662583790304787c7d SHA-256: 1d7cd18acf615324949e25229961f70f57e034671e06c8e3e02ee1c6fd095753
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress uploads and other disposable hosting sites. The primary purpose appears to be directing users to external, potentially malicious content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://coretry.ru/uplcv?utm_term=manual+del+celular+moto+e5+plus PDF link annotation
    • https://krygina40.ru/UserFiles/File/94297890774.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/onsieui4u6ihkjk864k0j57655/20086101288.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/rotijepukoxajasedifija.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/7e5158089224cd916e7de4719e9f440c/93079583553.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703b4443cbe---lawazimezulijubu.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/dfe0c7e9a05370edca80e084616f8f11/12162091472.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/35611510257.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-07-10-03-02-44-EMkPtbQg.pdfIn PDF document text
    • http://petrduchek.com/files/kajivavixabuma.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/161159e05225af---91576332026.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/0face5ebd806d90bc87be030e27f9895/24322661725.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/0e9bdeeb022644321821d4e0d5873a38/96808579349.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/6718683210.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/viip67u86hth0rl2pvpfsn7q05/68422487956.pdfIn PDF document text
    • https://ahirealty.in/admin/userfiles/files/78221956006.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/rugovesoz.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/9973873761.pdfIn PDF document text
    • http://sherylrobphotos.com/clients/56056/File/97653600208.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sizekajikadifopatezufexo.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/d54c71ee7426079d9f721b3833a7f667/33588996863.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/69eb131af8f8b8b834c1ff5f2c5a3690/60060418991.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/67374481728.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/57121090187.pdfIn PDF document text
    • https://galaxy-training.com/userfiles/file/jeratosixiwab.pdfIn PDF document text
    • 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_off00014a08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A08 20824 bytes
SHA-256: cdd6d4fabfa8e7b0e2d030ae839f502b1d9c6f7ba79f38eb76c6e697380709b4
font_01_sfnt_off000180eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x180EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19902 10808 bytes
SHA-256: 1ce0c322c78c25fea1b3f77a9e49858b58f5246e388c4fe8831127c44177967a

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