Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3af29a89a7fb1b3…

MALICIOUS

PDF

78.3 KB Created: 2021-09-14 07:34:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 119bb6b2a6d07758eff6681b74aadf91 SHA-1: 83cadb0db30e13a190280b94a9bd576985408189 SHA-256: b3af29a89a7fb1b3a24f23cab5c8b10f2fea55cdfa024be8f91a6ce9a5a5fbf8
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of ML and ClamAV detections, along with heuristics indicating a compromised CMS upload and a link farm, strongly supports a malicious intent. The embedded JavaScript likely facilitates the redirection or execution of further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://pixomot.ru/uplcv?utm_term=watch+draft+day+online+free PDF link annotation
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/s8va5n4mp2s07brm45np4pk31m/64677860093.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/5447341840.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161385b890f379---xetim.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/8964449153.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/56766127371.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/64745236158.pdfIn PDF document text
    • http://podushka.by/files/files/77130190278.pdfIn PDF document text
    • https://cityface.cz/res/file/76719862491.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/sageximumesatigafogax.pdfIn PDF document text
    • http://ryukatsu.com/userData/board/file/11061727495.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/4cilv18vj6qu7hlblbd99jpap0/80385039251.pdfIn PDF document text
    • https://duocvinhkim.com/userfiles/file/dodisetuvupeged.pdfIn PDF document text
    • http://qdcmd.com/data/files/sitabego.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/47777270975.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/nadiwunafarawukifeferixub.pdfIn macro / runtime command snippet
    • https://oferta.lt/i/File/27382124073.pdfIn macro / runtime command snippet
    • http://tiszaladany.hu/upload/file/48862815693.pdfIn PDF document text
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/11628981531.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/950763058c5e53476a945ef12dc0cc47/31643080622.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/vivuniw.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/95176400438.pdfIn PDF document text
    • http://recepti.plovdivweek.com/js/ckfinder/userfiles/files/worepakorofiraz.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/68277912718.pdfIn PDF document text
    • https://luatkhangthai.vn/upload/fck/file/98957810145.pdfIn PDF document text
    • https://playerpress.com/ckfiIn macro / runtime command snippet
    • 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_off0000cd9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD9F 10512 bytes
SHA-256: 74ff1e207d2d32f85bbfc85984a2934bd6ab5b7a413a01cbbecac9fec9681edc
font_01_sfnt_off0000e57e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD90 17524 bytes
SHA-256: aa2c66f8ff1709f15e1fa2da68332e65141b9d7a85b4fa5f6d484d0bb76d3fd7

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