Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2554f807da027f5…

MALICIOUS

PDF

89.6 KB Created: 2021-08-08 07:14:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 4ed4b43ca2ac0ec8ed0de6886dbf3555 SHA-1: 00bfe170f3e4141357dfb38295b880ccbddb405e SHA-256: d2554f807da027f5c50781e1b203b104d0a9c71cf767ff3ce64fcb60d7ba07a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://alexanderkanevskyartgallery.com/clientMedia/file/17725930227.pdf In PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/bifaxevap.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/d6c38b693cd50f4b4420f945a96ff8dc/xutoda.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2794bd6b11---49596124632.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c85fd5ac99---kojotikinemeded.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210629194533_1075670445.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/kasifitobukomamugolik.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/18288475334.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210718200541.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85da8336f0---fasadeto.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/81da427583feb3ab6f3da8818db64d43/74308040739.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/tixamolaworejenu.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/d6ba0c6e05916ac410d9418c22bcad06/zadegadiwinu.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/d8bc437b2c999ecc785b92bc3dcf7a27/76009680288.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c01ea72e89d---62889972556.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/gr7i4quuetfd6kja0s0mvbtb37/sonokuve.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202161165214740.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/93206639729.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/65634679366.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/javamoxadakunozegilunerep.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/46815269662.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/sagekiki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+soft+reset+a+lenovo+tabletPDF 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_off0000fc07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC07 17100 bytes
SHA-256: 92610042afc3062225fb922c4b8f4467529433703a2ad8f02c98d5ef37cb6925
font_01_sfnt_off0001284d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1284D 10396 bytes
SHA-256: 508fc2b871cff4548da40f54019de210a1f30d251b611b93bba10a9ad447cfae
font_02_sfnt_off0001400c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1400C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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