Malicious PDF — malware analysis report

Static analysis result for SHA-256 185cf10b45cda4e4…

MALICIOUS

PDF

79.2 KB Created: 2021-09-01 01:55:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b25d8081ba8f940ec25e080174de4e95 SHA-1: f7b15f030b9eb18241191478c8948a6fc67af359 SHA-256: 185cf10b45cda4e4ec55451ad55d92e671a37cbee1160b9eea29f21f5e58a21f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous links to compromised WordPress upload storage and other disposable hosting sites, indicating a link farm designed to redirect users. The presence of external URIs and the overall structure suggest it's part of a phishing or malware distribution campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 http://marta-galan.com/files/varios/file/gunilobazi.pdf In PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/16707496145.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160886692350aa---riberobovuwejomiwokuki.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16070399a65e6f---degefupudumupimu.pdfIn PDF document text
    • http://clinicoral.com/img/userfiles/files/80653614882.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/2021825_44429_489.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/745ce729d8b480ee9c8dd5b31f9dd160/28629536774.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/43027525530.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/57932701875.pdfIn PDF document text
    • https://equalitas.es/userfiles/file/95888663387.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e6f4e3251---5215170017.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098831fbd792---7915731818.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/90dbcb01d040dda0749a2071175cf6b9/jikaxuxutamupepifeged.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/siwevipixuki.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c9a1c1e52---masetisopox.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/74193562306.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/ov0mec5snjcgchn82iubbgtcu9/nedomivutilitobozirete.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c684b7583b---guxodi.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/konatokavepixuvogal.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/44212104466.pdfIn PDF document text
    • http://fatename.com/uploads/files/202108301406477144.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/vbhn4c3mbr9p1atnav63rt6t72/74050020359.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=whole+word+stutteringPDF 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_off0000d21d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD21D 10544 bytes
SHA-256: 301ae156cfa5c5829b9bd89c7b3c9e8f9b56836973ec6fc75076c3d348b4555e
font_01_sfnt_off0000e9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EC 17508 bytes
SHA-256: c758475d03d4b94161ce481d12b3debe3d5b6f50e89f1913bf471d52a430de48
font_02_sfnt_off000116df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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