Malicious PDF — malware analysis report

Static analysis result for SHA-256 09628f5c318c4e18…

MALICIOUS

PDF

92.4 KB Created: 2021-08-09 12:57:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7788d1548aa4f178ed45c372bcfe9001 SHA-1: bacf33fd9e0f1570e18e04c7261448d3f827b3f8 SHA-256: 09628f5c318c4e18aef0ee845fc5788246910d4932636e231a14072286bc1534
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wastran.ru/uplcv?utm_term=what+does+seeing+11111+mean PDF link annotation
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/29097853169.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/qqh3n6895ckmatia0gg6r2lol4/vugofukigomo.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/pumetejimivosok.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/jinigogitarexebisenu.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/55339005391.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/8f8e7e9d6eefb7969bf01d755fccd9b8/rinimege.pdfIn PDF document text
    • http://digifast.cz/userfiles/xavuwoxadolokotin.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/dgt48kffp4h5t96u64g9d9elcm/87917592938.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/74908244290.pdfIn PDF document text
    • https://j26clean.com/upload/files/37595781640.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/0a08a0aae4f18f00ce56895e0fb9c570/26151414195.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/pmre01buqraa7d08vs7fl37cvv/32688653333.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609d35dfca958---35277661098.pdfIn PDF document text
    • https://cristalensi.com/public/File/koreramefavifer.pdfIn PDF document text
    • http://beachhigh65.com/clients/879402/File/nugotukisofawo.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/tllrn9pbtmucq68p72328ounec/38271507363.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b52b600fda---11307273084.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1608a07ed8e022---75919492170.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/23900924126.pdfIn PDF document text
    • http://piau-po21inn.com/CKEdit/upload/files/jivumekiburiseb.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF3 17248 bytes
SHA-256: 995cce2337fe2ab42a96c59fe77aa998abed167e6719bfa758456d8a79d486ac
font_01_sfnt_off0001076c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076C 16900 bytes
SHA-256: 5e667872cd821b1fadb854e7ffe9bd68f3826ff6dbdb0a31a056d92eff1812fb
font_02_sfnt_off00013398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13398 10592 bytes
SHA-256: fdd5f91749b9a493f2109f0d3b19fb857df5f749ac427f469900070a171f591f
font_03_sfnt_off00014b77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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