Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d93f533c1c9ca9e…

MALICIOUS

PDF

80.1 KB Created: 2021-09-17 12:45:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d1313a9668c00bfa66c45fa1b2097ecb SHA-1: d29c537533f9ef44adc92c5aeccc943dc762a709 SHA-256: 0d93f533c1c9ca9e0cd2ed4a48855d303bd6d53fe072ce1f0c1192991da043f0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of a download button lure further supports this conclusion.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ceroki.com/image/files/bijikudibefu.pdf In PDF document text
    • http://cuacuonbinhduong.com/upload/files/48788761270.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/58267489111.pdfIn PDF document text
    • http://hotelalbicia.com/userfiles/file/riwax.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/sabozob.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/886178552.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/5020780919.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16131d4d8e3812---lonufulibelozuduf.pdfIn PDF document text
    • http://qwerty.pl/_data/file/24024157128.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/73994616753.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ced03c59d---80761653737.pdfIn PDF document text
    • http://yuc-fac.com/uploadfiles/20210903125518.pdfIn PDF document text
    • https://memo-log.com/userfiles/file/51005796700.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/22031145666.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/jokemugawev.pdfIn PDF document text
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/15157706285.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142f23a86924---50616617547.pdfIn PDF document text
    • http://spellenindex.nl/images/uploads/42052541386.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/moberiboxoxodugopafe.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/29909467413.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/20495309050.pdfIn PDF document text
    • https://latrinquette.com/upload/editor/file/80066627242.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/pejinomibij.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/58296272193.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=lightroom+vip+apkPDF 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_off0000d511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD511 17692 bytes
SHA-256: 04dcaf1203115e888585739d3392ef1c3f7cfc8251a4b8908735fef17b1e697a
font_01_sfnt_off0001036d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B84 10364 bytes
SHA-256: 247623bdb01ecb3b4427f929ea30ee4e50f08eb73027b4366b23d0a3630c476b

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