Malicious PDF — malware analysis report

Static analysis result for SHA-256 c26d83a1614c37a2…

MALICIOUS

PDF

69.9 KB Created: 2021-09-21 10:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5cb495f5ba453d47e51ffc6b7f0bc46e SHA-1: 26696c0564a64142490b3eeec89b72c0f0e82eee SHA-256: c26d83a1614c37a24de883416a573f3c8e020ad86610f317f741f435e15f09da
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall detection strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://pistant.ru/uplcv?utm_term=android+emulator+intellij PDF link annotation
    • http://tznjl.com/userfiles/files/loxiwepipepudisafikinuzu.pdfIn PDF document text
    • http://tongkhomica.com/upload/files/wizizuletelolim.pdfIn PDF document text
    • https://butchercurnow.com/img/shop/contents/42958435756.pdfIn PDF document text
    • http://xn--2e0b30g3uq7pay7m.com/upload/fckeditor/file/69222438446.pdfIn PDF document text
    • http://msmzizkov.cz/data/dokumenty/54274166293.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161316fca65ffa---finaxu.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/83314745061.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/47698159707.pdfIn PDF document text
    • http://hansungid.com/userfiles/file/2094928369.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/71283308298.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/vukulasa.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0b4c2a3ec---30815117164.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///21707181863.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/laleranapegebibizaruxep.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/41140299919.pdfIn PDF document text
    • http://shiraz.sk/ckfinder/userfiles/files/55163420285.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/29059521148.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae736477bd---33317842368.pdfIn PDF document text
    • http://cuathepvangohaiduong.com/images/ckeditor/files/58422022001.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/e939905323f38f3f88532ab8512ba69a/pesibelenunusukofagipog.pdfIn PDF document text
    • http://chongros.com/userData/board/file/sexuvukukizamemupur.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/xirebivugepanuwavulov.pdfIn PDF document text
    • https://robertbah.si/files/file/70591066563.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_off0000b385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB385 15264 bytes
SHA-256: 94e7c00b9c660bf9588907b485397f008136e5af082d0b7715b6ea3a3ae9405e
font_01_sfnt_off0000da25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA25 10452 bytes
SHA-256: 4aa5e887b574f4ddcaf90fbf08159ec05e354922e2920bde32ce904d66dd7c58
font_02_sfnt_off0000f1ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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