Malicious PDF — malware analysis report

Static analysis result for SHA-256 1be55bfca4992af8…

MALICIOUS

PDF

82.6 KB Created: 2021-09-07 21:45:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c0d74d912114f609228ae531e7a2c208 SHA-1: a22c8bf655c1bc0402f261eae51039bc72de2895 SHA-256: 1be55bfca4992af8e9dcce85ffb78598c3338d4173cecb343605f8d7f143c2b4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or delivering malicious content. It also contains numerous links to external websites, many of which are hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5567d2f43---vunowozewebedalokasawopab.pdf In PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da84ccf428---73437004693.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/mamaje.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/39731465597.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/0q6mq12jhr0ju6ghlfbsd0ge05/xebumonatefelitafadulejo.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607de8d7c34b5---34087802280.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/f21f7a9fe29a0710178cbf192d333c26/40935542353.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/kefoxoge.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0097caf209---xevukirogipuzajijeme.pdfIn PDF document text
    • http://vendingchat.ru/uploads/ckfinder/files/73351238941.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210702_202114.pdfIn PDF document text
    • http://fedoro.ru/upload/file/58408563758.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/bediwefegodi.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/63420056318.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/66638215807.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/9db88448c461f207c7e99ec57cca71fc/75403450470.pdfIn PDF document text
    • http://builderall.info/userfiles/file/40281787251.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/xifofubinuxa.pdfIn PDF document text
    • https://biovuspharma.net/userfiles/files/15943532841.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/5nk4dnga7h3q3omr38vs5kf1j2/vesiwinowawokiwexuwegize.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b27a960aa55---vonanenuxetajodelaxu.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/pajosavovixogifurubokunes.pdfIn PDF document text
    • https://ready4use.ru/uploads/files/12474372383.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/vopeweririlumogaxebu.pdfIn PDF document text
    • http://dominant.name/userfiles/file/jubowofevirawidumeraw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=extremism+in+pakistan+pdfPDF 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_off0000dda3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA3 17908 bytes
SHA-256: c53853d74b5cefba9641d2f47ffea01acc7373d801e725f75d3c59b79fdd6e1c
font_01_sfnt_off00010c88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C88 10672 bytes
SHA-256: 46126117eed0d5a816dca358c481ba534bceb708b0c67c7c7d33f2ea34b5e2cb
font_02_sfnt_off000124ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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