Malicious PDF — malware analysis report

Static analysis result for SHA-256 1892bfa25ac03db3…

MALICIOUS

PDF

78.1 KB Created: 2021-09-11 22:19:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5a5d06ecc9ca92e41e8b5d27b2bee82c SHA-1: a33e6c414f07cb015ca65ef06c0d1c07f676c4a4 SHA-256: 1892bfa25ac03db3b0f24aefb98b4f6f54554d5bd493f2b17e39cc753ef09c31
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains a link farm with numerous external URIs pointing to various domains, some of which are hosted on compromised CMS platforms or disposable hosting. The presence of these links suggests an attempt to redirect users to malicious sites, likely for phishing or malware delivery, aligning with the 'Spearphishing Attachment' technique.

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://garglob.ru/uplcv?utm_term=one+block+minecraft+download+mcpe PDF link annotation
    • https://bharatceramics.in/ckfinder/userfiles/files/9674900805.pdfIn PDF document text
    • http://annabarons.com/files/files/10412292044.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/40087194073.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/50873019053.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/43c7b78c3429f1680f63e987fbf1689d/65770879891.pdfIn PDF document text
    • https://bakwanudang.com/contents/files/mutigu.pdfIn PDF document text
    • http://nena-artspace.com/ckfinder/userfiles/files/zitini.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/gorexoregimoxuju.pdfIn PDF document text
    • http://thepducphat.com/upload/files/lezotofuletotinuresutoz.pdfIn PDF document text
    • http://esejsc.com/upload/files/35655035114.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/56545654872.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/67903178610.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/zapenegamoma.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/1035068636.pdfIn PDF document text
    • http://espaciocultivarte.com/ckfinder/userfiles/files/72369422432.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2505c9fda---53825654042.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/11129197229.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/suxovuxafudo.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/98008246614.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/viwutike.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/38661359288.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/kdhsc524965pm6frc52v6s85e3/9549300269.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/nonuxuvudenapasirav.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_off0000cd7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD7C 16764 bytes
SHA-256: 0571289f6d7d116db90a6e6f943c2c562f44db348ea29be6dbcf3e78ed230cdc
font_01_sfnt_off0000f966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF966 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001117d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1117D 10956 bytes
SHA-256: 659ed4ab16ec9a8f3e487ac5613624a160ecea2b5041b21516c41f96371e497d